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<?xml version="1.0" encoding="utf-8"?>
<search>
<entry>
<title>Android数据储存之SharedPreferences-记住密码案例</title>
<url>/posts/f454cc8e/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/wx_title-android_2018.11.09.png' >
<!-- more -->
<h2 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h2><blockquote>
<p>SharedPreferences是一种轻型的数据存储方式,通过键值对的形式保存数据，存储数据是以xml文件形式存储，文件存放在/data/data//shared_prefs目录下,一般用来存储一些简单的配置信息。</p>
</blockquote>
<h2 id="SharedPreferences操作模式"><a href="#SharedPreferences操作模式" class="headerlink" title="SharedPreferences操作模式"></a>SharedPreferences操作模式</h2><ol>
<li>MODE_PRIVATE：默认的操作模式，同名文件内容会被覆盖。</li>
<li>MODE_APPEND：则表示如果该文件已存在就往文件里面追加内容，不存在就创建新文件。</li>
</ol>
<h2 id="初始化SharedPreferences"><a href="#初始化SharedPreferences" class="headerlink" title="初始化SharedPreferences"></a>初始化SharedPreferences</h2><h3 id="Activity类中的getPreferences-mode-方法"><a href="#Activity类中的getPreferences-mode-方法" class="headerlink" title="Activity类中的getPreferences(mode)方法"></a>Activity类中的getPreferences(mode)方法</h3><ul>
<li>mode：指定操作模式</li>
<li>默认以当前类的类名作为前缀命名文件</li>
</ul>
<h3 id="Context类中的getSharedPreferences-name-mode-方法"><a href="#Context类中的getSharedPreferences-name-mode-方法" class="headerlink" title="Context类中的getSharedPreferences(name, mode)方法"></a>Context类中的getSharedPreferences(name, mode)方法</h3><ul>
<li>用于指定SharedPreferences文件的名称</li>
<li>指定操作模式</li>
</ul>
<h3 id="PreferenceManager类中的getDefaultSharedPreferences-context-方法"><a href="#PreferenceManager类中的getDefaultSharedPreferences-context-方法" class="headerlink" title="PreferenceManager类中的getDefaultSharedPreferences(context)方法"></a>PreferenceManager类中的getDefaultSharedPreferences(context)方法</h3><ul>
<li>静态方法，使用当前应用程序的包名作为前缀命名文件</li>
</ul>
<p><code>注：SharedPreferences可实现数据共享，但是无法直接在多个程序间共享，需要借助于Conttent Providers(内容分发者)</code></p>
<h2 id="SharedPreferences存储数据"><a href="#SharedPreferences存储数据" class="headerlink" title="SharedPreferences存储数据"></a>SharedPreferences存储数据</h2><ol>
<li>SharedPreferences通过Editor进行数据的编辑处理。</li>
</ol>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java">Editor editor=sharedPreferences.edit();<br></code></pre></td></tr></table></figure>
<ol start="2">
<li>存放数据<br>以Key-Value的形式储存，只适用于一些简单的数据类型<br><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/shareputdata20181108234424.png" alt="数据类型"></li>
<li>提交保存</li>
</ol>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-comment">//后台提交，没有返回值</span><br>editor.apply();<br><span class="hljs-comment">//编译处理，返回Boolean</span><br>editor.commit();<br></code></pre></td></tr></table></figure>
<p><code>注：apply是将修改数据原子提交到内存,而后异步真正提交到硬件磁盘,而commit是同步的提交到硬件磁盘，因此，在多个并发的提交commit的时候，他们会等待正在处理的commit保存到磁盘后在操作，从而降低了效率。而apply只是原子的提交到内容，后面有调用apply的函数的将会直接覆盖前面的内存数据，这样从一定程度上提高了很多效率。</code></p>
<ol start="4">
<li>移除数据</li>
</ol>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-comment">//移除数据</span><br>editor.remove(String key);<br><span class="hljs-comment">//清空数据</span><br>editor.clear();<br></code></pre></td></tr></table></figure>
<ol start="5">
<li>读取数据<br><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/shareGetData20181108235553.png" alt="getData"></li>
</ol>
<h2 id="记住密码案列"><a href="#记住密码案列" class="headerlink" title="记住密码案列"></a>记住密码案列</h2><p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/gif/111.gif" alt="记住密码~"></p>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-comment">//XML文件的形式储存</span><br><span class="hljs-comment">//设置本程序的私有访问</span><br> sharedPreferences=getSharedPreferences(<span class="hljs-string">"userInfo"</span>,MODE_PRIVATE);<br><br> <span class="hljs-comment">//获取程序中已保存的信息</span><br> rememeber.setChecked(sharedPreferences.getBoolean(<span class="hljs-string">"rememeber"</span>,<span class="hljs-literal">false</span>));<br> mName.setText(sharedPreferences.getString(<span class="hljs-string">"name"</span>,<span class="hljs-string">""</span>));<br> mPassWord.setText(sharedPreferences.getString(<span class="hljs-string">"password"</span>,<span class="hljs-string">""</span>));<br><br> mLogin.setOnClickListener(<span class="hljs-keyword">new</span> <span class="hljs-title class_">View</span>.OnClickListener() {<br> <span class="hljs-meta">@Override</span><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">onClick</span><span class="hljs-params">(View v)</span> {<br> String name=mName.getText().toString();<br> String password=mPassWord.getText().toString();<br> Editor editor=sharedPreferences.edit();<br> <span class="hljs-keyword">if</span>(name.equals(<span class="hljs-string">"admin"</span>)&&password.equals(<span class="hljs-string">"admin"</span>)){<br> <span class="hljs-comment">//标记是否勾选记住密码</span><br> <span class="hljs-type">boolean</span> flag=<span class="hljs-literal">false</span>;<br> <span class="hljs-keyword">if</span>(rememeber.isChecked()){<br> flag=<span class="hljs-literal">true</span>;<br> editor.putString(<span class="hljs-string">"name"</span>,name);<br> editor.putString(<span class="hljs-string">"password"</span>,password);<br> editor.putBoolean(<span class="hljs-string">"rememeber"</span>,<span class="hljs-literal">true</span>);<br> }<br> editor.putBoolean(<span class="hljs-string">"rememeber"</span>,flag);<br> editor.commit();<br> startActivityForResult(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Intent</span>(MainActivity.<span class="hljs-built_in">this</span>,Main2Activity.class).putExtra(<span class="hljs-string">"rememeber"</span>,flag),<span class="hljs-number">1</span>);<br> }<br><br> }<br> });<br></code></pre></td></tr></table></figure>
<p>下载地址: 等待上传~~</p>
]]></content>
<tags>
<tag>Android</tag>
<tag>数据储存</tag>
</tags>
</entry>
<entry>
<title>Android网络编程之HttpURLConnection应用-快递查询案例</title>
<url>/posts/660e61a1/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/2018.12.06_blog_title_httpdemo.png'>
<span id="more"></span>
<h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><blockquote>
<p><strong>HttpURLConnection</strong>是一种多用途、轻量极的HTTP客户端。它的API简单，体积较小，因而非常适用于Android项目，压缩和缓存机制可以有效地减少网络访问的流量，在提升速度和省电方面也起到了较大的作用，使用它来进行HTTP操作可以适用于大多数的应用程序。HttpUrlConnection是Android SDK的标准实现，直接支持系统级连接池，即打开的连接不会直接关闭，在一段时间内所有程序可共用；直接在系统层面做了缓存策略处理，加快重复请求的速度</p>
</blockquote>
<p>本文将以一个查询快递信息的案例来介绍，包括GET，POST两中方式请求网络资源，解析JSON数据，Handler异步消息处理机制等应用~</p>
<h2 id="部分代码"><a href="#部分代码" class="headerlink" title="部分代码"></a>部分代码</h2><ul>
<li>主界面<br><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/20181206200417_blog_adroid_httpdemo.png"></li>
<li>这里主要介绍GET和POST两种网络请求方式</li>
</ul>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">private</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">doGet</span><span class="hljs-params">(<span class="hljs-keyword">final</span> String params)</span> {<br> <span class="hljs-comment">//子线程执行网络操作</span><br> <span class="hljs-keyword">new</span> <span class="hljs-title class_">Thread</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Runnable</span>() {<br> <span class="hljs-meta">@Override</span><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">run</span><span class="hljs-params">()</span> {<br> <span class="hljs-keyword">try</span> {<br> <span class="hljs-type">URL</span> <span class="hljs-variable">url</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">URL</span>(URL_Source+<span class="hljs-string">"?type="</span>+URLEncoder.encode(Param_DHL,<span class="hljs-string">"UTF-8"</span>)+<span class="hljs-string">"&postid="</span>+URLEncoder.encode(params,<span class="hljs-string">"UTF-8"</span>));<br> <span class="hljs-type">HttpURLConnection</span> <span class="hljs-variable">httpURLConnection</span> <span class="hljs-operator">=</span> (HttpURLConnection) url.openConnection();<br> httpURLConnection.setRequestMethod(<span class="hljs-string">"GET"</span>);<span class="hljs-comment">//设置请求方式为GET</span><br> httpURLConnection.setReadTimeout(<span class="hljs-number">3000</span>);<span class="hljs-comment">//设置连接超时时间</span><br> <span class="hljs-keyword">if</span>(httpURLConnection.getResponseCode() == <span class="hljs-number">200</span>){<br> <span class="hljs-type">InputStream</span> <span class="hljs-variable">is</span> <span class="hljs-operator">=</span> httpURLConnection.getInputStream();<br> <span class="hljs-type">BufferedReader</span> <span class="hljs-variable">br</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">BufferedReader</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">InputStreamReader</span>(is));<br> <span class="hljs-type">String</span> <span class="hljs-variable">line</span> <span class="hljs-operator">=</span><span class="hljs-string">""</span>;<br> StringBuffer result= <span class="hljs-keyword">new</span> <span class="hljs-title class_">StringBuffer</span>();<br> <span class="hljs-keyword">while</span>((line = br.readLine()) != <span class="hljs-literal">null</span>){<br> result.append(line);<br> }<br> is.close();<br> br.close();<br><br> httpURLConnection.disconnect();<span class="hljs-comment">//关闭连接</span><br> <span class="hljs-type">Message</span> <span class="hljs-variable">message</span> <span class="hljs-operator">=</span><span class="hljs-keyword">new</span> <span class="hljs-title class_">Message</span>();<span class="hljs-comment">//创建消息体</span><br> message.what = <span class="hljs-number">1</span>;<br> message.obj = parseData(result.toString());<br> handler.sendMessage(message);<span class="hljs-comment">//发送消息体，添加到消息队列中</span><br><br> }<br> } <span class="hljs-keyword">catch</span> (MalformedURLException e) {<br> e.printStackTrace();<br> } <span class="hljs-keyword">catch</span> (IOException e) {<br> e.printStackTrace();<br> }<br><br><br> }<br> }).start();<br> }<br></code></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">private</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">doPost</span><span class="hljs-params">(<span class="hljs-keyword">final</span> String params)</span> {<br> <span class="hljs-keyword">new</span> <span class="hljs-title class_">Thread</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Runnable</span>() {<br> <span class="hljs-meta">@Override</span><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">run</span><span class="hljs-params">()</span> {<br> <span class="hljs-keyword">try</span> {<br> <span class="hljs-type">URL</span> <span class="hljs-variable">url</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">URL</span>(URL_Source);<br> <span class="hljs-type">HttpURLConnection</span> <span class="hljs-variable">httpURLConnection</span> <span class="hljs-operator">=</span> (HttpURLConnection) url.openConnection();<br> httpURLConnection.setConnectTimeout(<span class="hljs-number">3000</span>); <span class="hljs-comment">//设置连接超时时间</span><br> httpURLConnection.setDoInput(<span class="hljs-literal">true</span>); <span class="hljs-comment">//打开输入流，以便从服务器获取数据</span><br> httpURLConnection.setDoOutput(<span class="hljs-literal">true</span>); <span class="hljs-comment">//打开输出流，以便向服务器提交数据</span><br> httpURLConnection.setUseCaches(<span class="hljs-literal">false</span>); <span class="hljs-comment">//禁用缓存</span><br> httpURLConnection.setRequestMethod(<span class="hljs-string">"POST"</span>);<br> httpURLConnection.setRequestProperty(<span class="hljs-string">"Content-Type"</span>,<span class="hljs-string">"application/x-www-form-urlencoded"</span>);<span class="hljs-comment">//设置数据编码方式</span><br> <span class="hljs-type">String</span> <span class="hljs-variable">param</span> <span class="hljs-operator">=</span><span class="hljs-string">"type="</span>+URLEncoder.encode(Param_DHL,<span class="hljs-string">"UTF-8"</span>) +<span class="hljs-string">"&postid="</span>+URLEncoder.encode(params,<span class="hljs-string">"UTF-8"</span>);<br><br> <span class="hljs-type">OutputStream</span> <span class="hljs-variable">os</span> <span class="hljs-operator">=</span> httpURLConnection.getOutputStream();<br> os.write(param.getBytes());<br><br> <span class="hljs-keyword">if</span>(httpURLConnection.getResponseCode() == <span class="hljs-number">200</span>){<br> <span class="hljs-type">InputStream</span> <span class="hljs-variable">is</span> <span class="hljs-operator">=</span> httpURLConnection.getInputStream();<br> <span class="hljs-type">BufferedReader</span> <span class="hljs-variable">br</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">BufferedReader</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">InputStreamReader</span>(is));<br> <span class="hljs-type">String</span> <span class="hljs-variable">line</span> <span class="hljs-operator">=</span><span class="hljs-string">""</span>;<br> StringBuffer result= <span class="hljs-keyword">new</span> <span class="hljs-title class_">StringBuffer</span>();<br> <span class="hljs-keyword">while</span>((line = br.readLine()) != <span class="hljs-literal">null</span>){<br> result.append(line);<br> }<br> is.close();<br> br.close();<br><br> httpURLConnection.disconnect();<span class="hljs-comment">//关闭连接</span><br> <span class="hljs-type">Message</span> <span class="hljs-variable">message</span> <span class="hljs-operator">=</span><span class="hljs-keyword">new</span> <span class="hljs-title class_">Message</span>();<br> message.what = <span class="hljs-number">2</span>;<br> message.obj = parseData(result.toString());<br> handler.sendMessage(message);<br><br> }<br> } <span class="hljs-keyword">catch</span> (MalformedURLException e) {<br> e.printStackTrace();<br> } <span class="hljs-keyword">catch</span> (IOException e) {<br> e.printStackTrace();<br> }<br><br><br> }<br> }).start();<br> }<br></code></pre></td></tr></table></figure>
<ul>
<li>JSON数据的解析</li>
</ul>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">private</span> String <span class="hljs-title function_">parseData</span><span class="hljs-params">(String json)</span>{<br> <span class="hljs-type">String</span> <span class="hljs-variable">result</span> <span class="hljs-operator">=</span> <span class="hljs-string">""</span>;<br> <span class="hljs-keyword">try</span> {<br> <span class="hljs-type">JSONObject</span> <span class="hljs-variable">jsonObject</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">JSONObject</span>(json);<br> <span class="hljs-type">JSONArray</span> <span class="hljs-variable">data</span> <span class="hljs-operator">=</span> jsonObject.getJSONArray(<span class="hljs-string">"data"</span>);<br> <span class="hljs-comment">//这里只取最新的一条数据显示</span><br> <span class="hljs-keyword">if</span>(data.length()><span class="hljs-number">0</span>){<br> result=<span class="hljs-string">"更新时间: "</span>+data.getJSONObject(<span class="hljs-number">0</span>).getString(<span class="hljs-string">"time"</span>)+<br> <span class="hljs-string">"\n状态: "</span>+data.getJSONObject(<span class="hljs-number">0</span>).getString(<span class="hljs-string">"context"</span>);<br> }<span class="hljs-keyword">else</span>{<br> result = <span class="hljs-string">"该单号暂无物流进展,请稍后再试,或检查公司和单号是否有误"</span>;<br> }<br> } <span class="hljs-keyword">catch</span> (JSONException e) {<br> e.printStackTrace();<br> }<br> <span class="hljs-keyword">return</span> result;<br> }<br></code></pre></td></tr></table></figure>
<ul>
<li>使用Handler更新UI</li>
</ul>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">private</span> <span class="hljs-type">Handler</span> <span class="hljs-variable">handler</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">Handler</span>(){<br> <span class="hljs-meta">@Override</span><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">handleMessage</span><span class="hljs-params">(Message msg)</span> {<br> <span class="hljs-keyword">if</span>(msg.what == <span class="hljs-number">1</span>){<br> message.setText(<span class="hljs-string">"最新状态 (GET方式)"</span>);<br> info.setText(msg.obj+<span class="hljs-string">""</span>);<br> }<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (msg.what == <span class="hljs-number">2</span>){<br> message.setText(<span class="hljs-string">"最新状态 (POST方式)"</span>);<br> info.setText(msg.obj+<span class="hljs-string">""</span>);<br> }<br> }<br> };<br></code></pre></td></tr></table></figure>
<h2 id="动图演示"><a href="#动图演示" class="headerlink" title="动图演示"></a>动图演示</h2><p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/gif/20181206_android_httpdemo.gif"></p>
<h2 id="项目源码"><a href="#项目源码" class="headerlink" title="项目源码"></a>项目源码</h2><p>等待上传中~</p>
]]></content>
<tags>
<tag>Android</tag>
<tag>网络编程</tag>
<tag>JSON</tag>
<tag>HTTP</tag>
</tags>
</entry>
<entry>
<title>Android自定义Dialog对话框</title>
<url>/posts/1bd356c0/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/20181119_wx_title_dialog.png' >
<!-- more -->
<h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><blockquote>
<p>Android项目经常需要使用对话框来进行交互，本文将介绍一个简单自定义的Dialog案例</p>
</blockquote>
<h2 id="效果图"><a href="#效果图" class="headerlink" title="效果图"></a>效果图</h2><p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/gif/20181119dialogdemo.gif" alt="在这里插入图片描述"></p>
<h2 id="代码部分"><a href="#代码部分" class="headerlink" title="代码部分"></a>代码部分</h2><h3 id="自定义Dialog布局"><a href="#自定义Dialog布局" class="headerlink" title="自定义Dialog布局"></a>自定义Dialog布局</h3><figure class="highlight xml"><table><tr><td class="code"><pre><code class="hljs xml"><span class="hljs-meta"><?xml version=<span class="hljs-string">"1.0"</span> encoding=<span class="hljs-string">"utf-8"</span>?></span><br><span class="hljs-tag"><<span class="hljs-name">LinearLayout</span> <span class="hljs-attr">xmlns:android</span>=<span class="hljs-string">"http://schemas.android.com/apk/res/android"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">xmlns:app</span>=<span class="hljs-string">"http://schemas.android.com/apk/res-auto"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">xmlns:tools</span>=<span class="hljs-string">"http://schemas.android.com/tools"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_width</span>=<span class="hljs-string">"match_parent"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_height</span>=<span class="hljs-string">"match_parent"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:orientation</span>=<span class="hljs-string">"vertical"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">tools:context</span>=<span class="hljs-string">".MyDialog"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:background</span>=<span class="hljs-string">"@drawable/dialog_layout"</span>></span><br><br> <span class="hljs-tag"><<span class="hljs-name">TextView</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:id</span>=<span class="hljs-string">"@+id/title"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_width</span>=<span class="hljs-string">"match_parent"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_height</span>=<span class="hljs-string">"wrap_content"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:textColor</span>=<span class="hljs-string">"#000"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:text</span>=<span class="hljs-string">"提示"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:textStyle</span>=<span class="hljs-string">"bold"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:textSize</span>=<span class="hljs-string">"24sp"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:gravity</span>=<span class="hljs-string">"center"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:padding</span>=<span class="hljs-string">"10dp"</span>/></span><br><br> <span class="hljs-tag"><<span class="hljs-name">TextView</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:id</span>=<span class="hljs-string">"@+id/message"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_width</span>=<span class="hljs-string">"match_parent"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_height</span>=<span class="hljs-string">"wrap_content"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:textSize</span>=<span class="hljs-string">"18sp"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:textColor</span>=<span class="hljs-string">"#000"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:padding</span>=<span class="hljs-string">"20dp"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:gravity</span>=<span class="hljs-string">"center"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:text</span>=<span class="hljs-string">"删除"</span>/></span><br><br> <span class="hljs-tag"><<span class="hljs-name">View</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_width</span>=<span class="hljs-string">"match_parent"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_height</span>=<span class="hljs-string">"0.5dp"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:background</span>=<span class="hljs-string">"#000"</span></span><br><span class="hljs-tag"> ></span><span class="hljs-tag"></<span class="hljs-name">View</span>></span><br><br> <span class="hljs-tag"><<span class="hljs-name">LinearLayout</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_width</span>=<span class="hljs-string">"match_parent"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_height</span>=<span class="hljs-string">"wrap_content"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:orientation</span>=<span class="hljs-string">"horizontal"</span>></span><br><br> <span class="hljs-tag"><<span class="hljs-name">TextView</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:padding</span>=<span class="hljs-string">"10dp"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:id</span>=<span class="hljs-string">"@+id/canel"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_width</span>=<span class="hljs-string">"wrap_content"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_height</span>=<span class="hljs-string">"wrap_content"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_weight</span>=<span class="hljs-string">"1"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:textColor</span>=<span class="hljs-string">"#11c2ee"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:textSize</span>=<span class="hljs-string">"24sp"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:gravity</span>=<span class="hljs-string">"center"</span>/></span><br> <br> <span class="hljs-tag"><<span class="hljs-name">View</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_width</span>=<span class="hljs-string">"0.5dp"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_height</span>=<span class="hljs-string">"match_parent"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:background</span>=<span class="hljs-string">"#000"</span>></span><br> <span class="hljs-tag"></<span class="hljs-name">View</span>></span><br><br> <span class="hljs-tag"><<span class="hljs-name">TextView</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:padding</span>=<span class="hljs-string">"10dp"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:id</span>=<span class="hljs-string">"@+id/confirm"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_width</span>=<span class="hljs-string">"wrap_content"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_height</span>=<span class="hljs-string">"wrap_content"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:textColor</span>=<span class="hljs-string">"#11c2ee"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:layout_weight</span>=<span class="hljs-string">"1"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:textSize</span>=<span class="hljs-string">"24sp"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:gravity</span>=<span class="hljs-string">"center"</span></span><br><span class="hljs-tag"> /></span><br> <span class="hljs-tag"></<span class="hljs-name">LinearLayout</span>></span><br><span class="hljs-tag"></<span class="hljs-name">LinearLayout</span>></span><br></code></pre></td></tr></table></figure>
<h3 id="自定义Dialog背景-圆角"><a href="#自定义Dialog背景-圆角" class="headerlink" title="自定义Dialog背景(圆角)"></a>自定义Dialog背景(圆角)</h3><figure class="highlight xml"><table><tr><td class="code"><pre><code class="hljs xml"><span class="hljs-meta"><?xml version=<span class="hljs-string">"1.0"</span> encoding=<span class="hljs-string">"utf-8"</span>?></span><br><span class="hljs-tag"><<span class="hljs-name">shape</span> <span class="hljs-attr">xmlns:android</span>=<span class="hljs-string">"http://schemas.android.com/apk/res/android"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">android:shape</span>=<span class="hljs-string">"rectangle"</span>></span><br> //内部填充色<br> <span class="hljs-tag"><<span class="hljs-name">solid</span> <span class="hljs-attr">android:color</span>=<span class="hljs-string">"#ffffff"</span>></span><span class="hljs-tag"></<span class="hljs-name">solid</span>></span><br> //圆角半径<br> <span class="hljs-tag"><<span class="hljs-name">corners</span> <span class="hljs-attr">android:radius</span>=<span class="hljs-string">"20dp"</span>></span><span class="hljs-tag"></<span class="hljs-name">corners</span>></span><br><span class="hljs-tag"></<span class="hljs-name">shape</span>></span><br></code></pre></td></tr></table></figure>
<h3 id="通过style样式引用"><a href="#通过style样式引用" class="headerlink" title="通过style样式引用"></a>通过style样式引用</h3><figure class="highlight xml"><table><tr><td class="code"><pre><code class="hljs xml"><span class="hljs-tag"><<span class="hljs-name">style</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"MyDialog"</span> <span class="hljs-attr">parent</span>=<span class="hljs-string">"android:style/Theme.Dialog"</span>></span><span class="language-xml"></span><br><span class="language-xml"> <span class="hljs-comment"><!--背景颜色及和透明程度--></span></span><br><span class="language-xml"> <span class="hljs-tag"><<span class="hljs-name">item</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"android:windowBackground"</span>></span>@android:color/transparent<span class="hljs-tag"></<span class="hljs-name">item</span>></span></span><br><span class="language-xml"> <span class="hljs-comment"><!--是否去除标题 --></span></span><br><span class="language-xml"> <span class="hljs-tag"><<span class="hljs-name">item</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"android:windowNoTitle"</span>></span>true<span class="hljs-tag"></<span class="hljs-name">item</span>></span></span><br><span class="language-xml"> <span class="hljs-comment"><!--是否去除边框--></span></span><br><span class="language-xml"> <span class="hljs-tag"><<span class="hljs-name">item</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"android:windowFrame"</span>></span>@null<span class="hljs-tag"></<span class="hljs-name">item</span>></span></span><br><span class="language-xml"> <span class="hljs-comment"><!--是否浮现在activity之上--></span></span><br><span class="language-xml"> <span class="hljs-tag"><<span class="hljs-name">item</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"android:windowIsFloating"</span>></span>true<span class="hljs-tag"></<span class="hljs-name">item</span>></span></span><br><span class="language-xml"> <span class="hljs-comment"><!--是否模糊--></span></span><br><span class="language-xml"> <span class="hljs-tag"><<span class="hljs-name">item</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"android:backgroundDimEnabled"</span>></span>true<span class="hljs-tag"></<span class="hljs-name">item</span>></span></span><br><span class="language-xml"> </span><span class="hljs-tag"></<span class="hljs-name">style</span>></span><br></code></pre></td></tr></table></figure>
<h3 id="自定义Dialog类"><a href="#自定义Dialog类" class="headerlink" title="自定义Dialog类"></a>自定义Dialog类</h3><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">package</span> cn.sr.alertdialogdemo;<br><br><span class="hljs-keyword">import</span> android.app.Dialog;<br><span class="hljs-keyword">import</span> android.content.Context;<br><span class="hljs-keyword">import</span> android.graphics.Point;<br><span class="hljs-keyword">import</span> android.support.annotation.NonNull;<br><span class="hljs-keyword">import</span> android.os.Bundle;<br><span class="hljs-keyword">import</span> android.view.Display;<br><span class="hljs-keyword">import</span> android.view.View;<br><span class="hljs-keyword">import</span> android.view.WindowManager;<br><span class="hljs-keyword">import</span> android.widget.TextView;<br><br><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">MyDialog</span> <span class="hljs-keyword">extends</span> <span class="hljs-title class_">Dialog</span> <span class="hljs-keyword">implements</span> <span class="hljs-title class_">View</span>.OnClickListener{<br><br> <span class="hljs-keyword">private</span> TextView mTitle,mMessage,mCanel,mConfirm;<br> <span class="hljs-keyword">private</span> String title,message,canel,confirm;<br> <span class="hljs-keyword">private</span> OnCancelListtener onCancelListtener;<br> <span class="hljs-keyword">private</span> OnConfirmListtener onConfirmListtener;<br><br> <span class="hljs-keyword">public</span> MyDialog <span class="hljs-title function_">setTitle</span><span class="hljs-params">(String title)</span> {<br> <span class="hljs-built_in">this</span>.title = title;<br> <span class="hljs-keyword">return</span> <span class="hljs-built_in">this</span>;<br> }<br><br> <span class="hljs-keyword">public</span> MyDialog <span class="hljs-title function_">setMessage</span><span class="hljs-params">(String message)</span> {<br> <span class="hljs-built_in">this</span>.message = message;<br> <span class="hljs-keyword">return</span> <span class="hljs-built_in">this</span>;<br> }<br><br> <span class="hljs-keyword">public</span> MyDialog <span class="hljs-title function_">setCanel</span><span class="hljs-params">(String canel,OnCancelListtener onCancelListtener)</span> {<br> <span class="hljs-built_in">this</span>.canel = canel;<br> <span class="hljs-built_in">this</span>.onCancelListtener = onCancelListtener;<br> <span class="hljs-keyword">return</span> <span class="hljs-built_in">this</span>;<br> }<br><br> <span class="hljs-keyword">public</span> MyDialog <span class="hljs-title function_">setConfirm</span><span class="hljs-params">(String confirm,OnConfirmListtener onConfirmListtener)</span> {<br> <span class="hljs-built_in">this</span>.confirm = confirm;<br> <span class="hljs-built_in">this</span>.onConfirmListtener = onConfirmListtener;<br> <span class="hljs-keyword">return</span> <span class="hljs-built_in">this</span>;<br> }<br><br><br> <span class="hljs-keyword">public</span> <span class="hljs-title function_">MyDialog</span><span class="hljs-params">(<span class="hljs-meta">@NonNull</span> Context context)</span> {<br> <span class="hljs-built_in">super</span>(context);<br> }<br><br> <span class="hljs-keyword">public</span> <span class="hljs-title function_">MyDialog</span><span class="hljs-params">(<span class="hljs-meta">@NonNull</span> Context context,<span class="hljs-type">int</span> themeId)</span> {<br> <span class="hljs-built_in">super</span>(context,themeId);<br> }<br><br> <span class="hljs-meta">@Override</span><br> <span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">onCreate</span><span class="hljs-params">(Bundle savedInstanceState)</span> {<br> <span class="hljs-built_in">super</span>.onCreate(savedInstanceState);<br> setContentView(R.layout.activity_my_dialog);<br><br> <span class="hljs-comment">//如果对话框宽度异常，可以通过下方代码根据设备的宽度来设置弹窗宽度</span><br> <span class="hljs-type">WindowManager</span> <span class="hljs-variable">windowManager</span> <span class="hljs-operator">=</span> getWindow().getWindowManager();<br> <span class="hljs-type">Display</span> <span class="hljs-variable">display</span> <span class="hljs-operator">=</span> windowManager.getDefaultDisplay();<br> WindowManager.<span class="hljs-type">LayoutParams</span> <span class="hljs-variable">params</span> <span class="hljs-operator">=</span> getWindow().getAttributes();<br> Point point=<span class="hljs-keyword">new</span> <span class="hljs-title class_">Point</span>();<br> display.getSize(point);<br> params.width= (<span class="hljs-type">int</span>) (point.x * <span class="hljs-number">0.8</span>);<br> getWindow().setAttributes(params);<br><br> mTitle=findViewById(R.id.title);<br> mMessage=findViewById(R.id.message);<br> mCanel=findViewById(R.id.canel);<br> mConfirm=findViewById(R.id.confirm);<br><br> mCanel.setOnClickListener(<span class="hljs-built_in">this</span>);<br> mConfirm.setOnClickListener(<span class="hljs-built_in">this</span>);<br><br> mTitle.setText(title);<br> mMessage.setText(message);<br> mCanel.setText(canel);<br> mConfirm.setText(confirm);<br><br><br> }<br><br> <span class="hljs-meta">@Override</span><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">onClick</span><span class="hljs-params">(View v)</span> {<br> <span class="hljs-keyword">switch</span> (v.getId()){<br> <span class="hljs-keyword">case</span> R.id.canel:<br> <span class="hljs-keyword">if</span>(onCancelListtener != <span class="hljs-literal">null</span>){<br> onCancelListtener.onCancel(<span class="hljs-built_in">this</span>);<br> }<br> dismiss();<br> <span class="hljs-keyword">break</span>;<br><br> <span class="hljs-keyword">case</span> R.id.confirm:<br> <span class="hljs-keyword">if</span>(onConfirmListtener != <span class="hljs-literal">null</span>){<br> onConfirmListtener.onConfirm(<span class="hljs-built_in">this</span>);<br> }<br> dismiss();<br> <span class="hljs-keyword">break</span>;<br> }<br> }<br> <span class="hljs-comment">//自定义接口形式提供回调方法</span><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">interface</span> <span class="hljs-title class_">OnCancelListtener</span>{<br> <span class="hljs-keyword">void</span> <span class="hljs-title function_">onCancel</span><span class="hljs-params">(MyDialog myDialog)</span>;<br> }<br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">interface</span> <span class="hljs-title class_">OnConfirmListtener</span>{<br> <span class="hljs-keyword">void</span> <span class="hljs-title function_">onConfirm</span><span class="hljs-params">(MyDialog myDialog)</span>;<br> }<br>}<br><br></code></pre></td></tr></table></figure>
<h3 id="调用演示"><a href="#调用演示" class="headerlink" title="调用演示"></a>调用演示</h3><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">MainActivity</span> <span class="hljs-keyword">extends</span> <span class="hljs-title class_">AppCompatActivity</span> {<br><br> <span class="hljs-keyword">private</span> Button button;<br> <span class="hljs-meta">@Override</span><br> <span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">onCreate</span><span class="hljs-params">(Bundle savedInstanceState)</span> {<br> <span class="hljs-built_in">super</span>.onCreate(savedInstanceState);<br> setContentView(R.layout.activity_main);<br> button=findViewById(R.id.button);<br> button.setOnClickListener(<span class="hljs-keyword">new</span> <span class="hljs-title class_">View</span>.OnClickListener() {<br> <span class="hljs-meta">@Override</span><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">onClick</span><span class="hljs-params">(View v)</span> {<br> MyDialog myDialog=<span class="hljs-keyword">new</span> <span class="hljs-title class_">MyDialog</span>(MainActivity.<span class="hljs-built_in">this</span>);<br> myDialog.setTitle(<span class="hljs-string">"提示"</span>).setMessage(<span class="hljs-string">"这是一个自定义的Dialog"</span>).setCanel(<span class="hljs-string">"取消"</span>, <span class="hljs-keyword">new</span> <span class="hljs-title class_">MyDialog</span>.OnCancelListtener() {<br> <span class="hljs-meta">@Override</span><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">onCancel</span><span class="hljs-params">(MyDialog myDialog)</span> {<br> Toast.makeText(MainActivity.<span class="hljs-built_in">this</span>,<span class="hljs-string">"点击了取消按钮"</span>,Toast.LENGTH_SHORT).show();<br> }<br> }).setConfirm(<span class="hljs-string">"确认"</span>, <span class="hljs-keyword">new</span> <span class="hljs-title class_">MyDialog</span>.OnConfirmListtener() {<br> <span class="hljs-meta">@Override</span><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">onConfirm</span><span class="hljs-params">(MyDialog myDialog)</span> {<br> Toast.makeText(MainActivity.<span class="hljs-built_in">this</span>,<span class="hljs-string">"点击了确认按钮"</span>,Toast.LENGTH_SHORT).show();<br> }<br> }).show();<br> }<br> });<br> }<br>}<br></code></pre></td></tr></table></figure>
<h2 id="项目下载"><a href="#项目下载" class="headerlink" title="项目下载"></a>项目下载</h2><p>等待上传~</p>
]]></content>
<tags>
<tag>Android</tag>
<tag>数据储存</tag>
</tags>
</entry>
<entry>
<title>CentOS7更换Yum源为阿里云源</title>
<url>/posts/e8a99a62/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/wx_title_centos_yum_2018.11.21.png' >
<!-- more -->
<h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><p>Yum仓库部署在国外，为了方便之后项目环境的部署更新操作，最好更新为国内的镜像源，本文以阿里云源为例。<br>参考网站:<a href="https://opsx.alibaba.com/mirror">https://opsx.alibaba.com/mirror</a></p>
<h2 id="步骤"><a href="#步骤" class="headerlink" title="步骤"></a>步骤</h2><h3 id="1-备份"><a href="#1-备份" class="headerlink" title="1.备份"></a>1.备份</h3><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java">mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup<br></code></pre></td></tr></table></figure>
<p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/20181121_centosbf.png" alt="图中即为重命名的备份文件"></p>
<h3 id="2-下载阿里云的源文件"><a href="#2-下载阿里云的源文件" class="headerlink" title="2.下载阿里云的源文件"></a>2.下载阿里云的源文件</h3><p>这里我的虚拟机版本为CentOS 7，这里根据你的版本进行操作，参考上文链接</p>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java">wget -O /etc/yum.repos.d/CentOS-Base.repo http:<span class="hljs-comment">//mirrors.aliyun.com/repo/Centos-7.repo</span><br></code></pre></td></tr></table></figure>
<p><font color="red">注意：这里需要给与管理员权限<font/><br><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/20181121213830.png" alt="在这里插入图片描述"></p>
<h3 id="3-生成缓存"><a href="#3-生成缓存" class="headerlink" title="3.生成缓存"></a>3.生成缓存</h3><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java">yum makecache<br></code></pre></td></tr></table></figure>
<p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/20181121214100.png" alt="在这里插入图片描述"></p>
<h2 id="结尾"><a href="#结尾" class="headerlink" title="结尾"></a>结尾</h2><p>如果更换源后出现问题，则需要先清除默认Yum源的本地缓存</p>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java">yum clean all<br></code></pre></td></tr></table></figure>
]]></content>
<tags>
<tag>Linux</tag>
</tags>
</entry>
<entry>
<title>Mybatis批量更新的两种方式</title>
<url>/posts/bff75e50/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/weixin_2019.04.23.png' >
<!-- more -->
<h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><blockquote>
<p>在使用Mybatis框架的过程中,经常会通过构建动态SQL来处理批量插入，批量更新数据等相关操作，本文将以批量更新为例，简单介绍其使用过程</p>
</blockquote>
<h3 id="动态SQL元素"><a href="#动态SQL元素" class="headerlink" title="动态SQL元素"></a>动态SQL元素</h3><p><kbd>if</kbd> <kbd>set</kbd> <kbd>trim</kbd> <kbd>foreach</kbd></p>
<h2 id="批量更新"><a href="#批量更新" class="headerlink" title="批量更新"></a>批量更新</h2><p>映射方法</p>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-type">int</span> <span class="hljs-title function_">updateOrderItem</span><span class="hljs-params">(List<OrderItem> list)</span>;<br></code></pre></td></tr></table></figure>
<p>实体类字段</p>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">OrderItem</span> {<br> <span class="hljs-keyword">private</span> Integer id;<br> <span class="hljs-keyword">private</span> Integer orderId;<br> <span class="hljs-keyword">private</span> Integer productId;<br> <span class="hljs-keyword">private</span> Integer count;<br> <span class="hljs-comment">//省略...</span><br> }<br></code></pre></td></tr></table></figure>
<p>测试代码</p>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java">List<OrderItem> list=<span class="hljs-keyword">new</span> <span class="hljs-title class_">ArrayList</span><>();<br>OrderItem orderItem=<span class="hljs-keyword">new</span> <span class="hljs-title class_">OrderItem</span>();<br>orderItem.setCount(<span class="hljs-number">66</span>);<br>orderItem.setId(<span class="hljs-number">1</span>);<br>OrderItem orderItem1=<span class="hljs-keyword">new</span> <span class="hljs-title class_">OrderItem</span>();<br>orderItem1.setCount(<span class="hljs-number">5</span>);<br>orderItem1.setId(<span class="hljs-number">2</span>);<br>list.add(orderItem);<br>list.add(orderItem1);<br>orderItemMapper.updateOrderItem(list);<br></code></pre></td></tr></table></figure>
<h3 id="方式一"><a href="#方式一" class="headerlink" title="方式一"></a>方式一</h3><figure class="highlight xml"><table><tr><td class="code"><pre><code class="hljs xml"><span class="hljs-tag"><<span class="hljs-name">update</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"updateOrderItem"</span> <span class="hljs-attr">parameterType</span>=<span class="hljs-string">"java.util.List"</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">foreach</span> <span class="hljs-attr">collection</span>=<span class="hljs-string">"list"</span> <span class="hljs-attr">item</span>=<span class="hljs-string">"item"</span> <span class="hljs-attr">separator</span>=<span class="hljs-string">";"</span>></span><br> update order_item<br> <span class="hljs-tag"><<span class="hljs-name">set</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">if</span> <span class="hljs-attr">test</span>=<span class="hljs-string">"item.orderId != null"</span>></span><br> order_id = #{item.orderId},<br> <span class="hljs-tag"></<span class="hljs-name">if</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">if</span> <span class="hljs-attr">test</span>=<span class="hljs-string">"item.productId != null"</span>></span><br> product_id = #{item.productId},<br> <span class="hljs-tag"></<span class="hljs-name">if</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">if</span> <span class="hljs-attr">test</span>=<span class="hljs-string">"item.count != null"</span>></span><br> count = #{item.count}<br> <span class="hljs-tag"></<span class="hljs-name">if</span>></span><br> <span class="hljs-tag"></<span class="hljs-name">set</span>></span><br> where id = #{item.id}<br> <span class="hljs-tag"></<span class="hljs-name">foreach</span>></span><br><span class="hljs-tag"></<span class="hljs-name">update</span>></span><br></code></pre></td></tr></table></figure>
<p>对应SQL:</p>
<figure class="highlight sql"><table><tr><td class="code"><pre><code class="hljs sql">[cn.srblog.dao.OrderItemMapper.updateOrderItem]<span class="hljs-operator">-</span><span class="hljs-operator">=</span><span class="hljs-operator">=</span><span class="hljs-operator">></span> Preparing: <span class="hljs-keyword">update</span> order_item <span class="hljs-keyword">SET</span> count <span class="hljs-operator">=</span> ? <span class="hljs-keyword">where</span> id <span class="hljs-operator">=</span> ? ; <span class="hljs-keyword">update</span> order_item <span class="hljs-keyword">SET</span> count <span class="hljs-operator">=</span> ? <span class="hljs-keyword">where</span> id <span class="hljs-operator">=</span> ? <br>[cn.srblog.dao.OrderItemMapper.updateOrderItem]<span class="hljs-operator">-</span><span class="hljs-operator">=</span><span class="hljs-operator">=</span><span class="hljs-operator">></span> Parameters: <span class="hljs-number">66</span>(<span class="hljs-type">Integer</span>), <span class="hljs-number">1</span>(<span class="hljs-type">Integer</span>), <span class="hljs-number">5</span>(<span class="hljs-type">Integer</span>), <span class="hljs-number">2</span>(<span class="hljs-type">Integer</span>)<br>[cn.srblog.dao.OrderItemMapper.updateOrderItem]<span class="hljs-operator">-</span><span class="hljs-operator"><=</span><span class="hljs-operator">=</span> Updates: <span class="hljs-number">1</span><br></code></pre></td></tr></table></figure>
<p>此方式需要允许MySQL的一次执行多条SQL</p>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java">url=jdbc:mysql:<span class="hljs-comment">//localhost:3306/ssm?characterEncoding=utf-8&allowMultiQueries=true</span><br></code></pre></td></tr></table></figure>
<h3 id="方式二"><a href="#方式二" class="headerlink" title="方式二"></a>方式二</h3><figure class="highlight xml"><table><tr><td class="code"><pre><code class="hljs xml"><span class="hljs-tag"><<span class="hljs-name">update</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"updateOrderItem"</span> <span class="hljs-attr">parameterType</span>=<span class="hljs-string">"java.util.List"</span>></span><br> update order_item<br> <span class="hljs-tag"><<span class="hljs-name">trim</span> <span class="hljs-attr">prefix</span>=<span class="hljs-string">"set"</span> <span class="hljs-attr">suffixOverrides</span>=<span class="hljs-string">","</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">trim</span> <span class="hljs-attr">prefix</span>=<span class="hljs-string">"orderId = case"</span> <span class="hljs-attr">suffix</span>=<span class="hljs-string">"end,"</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">foreach</span> <span class="hljs-attr">collection</span>=<span class="hljs-string">"list"</span> <span class="hljs-attr">item</span>=<span class="hljs-string">"item"</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">if</span> <span class="hljs-attr">test</span>=<span class="hljs-string">"item.orderId != null"</span>></span><br> when id=#{item.id} then #{item.orderId}<br> <span class="hljs-tag"></<span class="hljs-name">if</span>></span><br> <span class="hljs-tag"></<span class="hljs-name">foreach</span>></span><br> <span class="hljs-tag"></<span class="hljs-name">trim</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">trim</span> <span class="hljs-attr">prefix</span>=<span class="hljs-string">"productId = case"</span> <span class="hljs-attr">suffix</span>=<span class="hljs-string">"end,"</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">foreach</span> <span class="hljs-attr">collection</span>=<span class="hljs-string">"list"</span> <span class="hljs-attr">item</span>=<span class="hljs-string">"item"</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">if</span> <span class="hljs-attr">test</span>=<span class="hljs-string">"item.productId != null"</span>></span><br> when id=#{item.id} then #{item.productId}<br> <span class="hljs-tag"></<span class="hljs-name">if</span>></span><br> <span class="hljs-tag"></<span class="hljs-name">foreach</span>></span><br> <span class="hljs-tag"></<span class="hljs-name">trim</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">trim</span> <span class="hljs-attr">prefix</span>=<span class="hljs-string">"count = case"</span> <span class="hljs-attr">suffix</span>=<span class="hljs-string">"end,"</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">foreach</span> <span class="hljs-attr">collection</span>=<span class="hljs-string">"list"</span> <span class="hljs-attr">item</span>=<span class="hljs-string">"item"</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">if</span> <span class="hljs-attr">test</span>=<span class="hljs-string">"item.count != null"</span>></span><br> when id=#{item.id} then #{item.count}<br> <span class="hljs-tag"></<span class="hljs-name">if</span>></span><br> <span class="hljs-tag"></<span class="hljs-name">foreach</span>></span><br> <span class="hljs-tag"></<span class="hljs-name">trim</span>></span><br> <span class="hljs-tag"></<span class="hljs-name">trim</span>></span><br> where id in<br> <span class="hljs-tag"><<span class="hljs-name">foreach</span> <span class="hljs-attr">collection</span>=<span class="hljs-string">"idNames"</span> <span class="hljs-attr">index</span>=<span class="hljs-string">"index"</span> <span class="hljs-attr">item</span>=<span class="hljs-string">"item"</span> <span class="hljs-attr">open</span>=<span class="hljs-string">"("</span> <span class="hljs-attr">separator</span>=<span class="hljs-string">","</span> <span class="hljs-attr">close</span>=<span class="hljs-string">")"</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">if</span> <span class="hljs-attr">test</span>=<span class="hljs-string">"item.objectId != null"</span>></span><br> #{item.id}<br> <span class="hljs-tag"></<span class="hljs-name">if</span>></span><br> <span class="hljs-tag"></<span class="hljs-name">foreach</span>></span><br> <span class="hljs-tag"></<span class="hljs-name">update</span>></span><br></code></pre></td></tr></table></figure>
<p>对应SQL</p>
<figure class="highlight sql"><table><tr><td class="code"><pre><code class="hljs sql">[cn.srblog.dao.OrderItemMapper.updateOrderItem]<span class="hljs-operator">-</span><span class="hljs-operator">=</span><span class="hljs-operator">=</span><span class="hljs-operator">></span> Preparing: <span class="hljs-keyword">update</span> order_item <span class="hljs-keyword">set</span> count <span class="hljs-operator">=</span> <span class="hljs-keyword">case</span> <span class="hljs-keyword">when</span> id<span class="hljs-operator">=</span>? <span class="hljs-keyword">then</span> ? <span class="hljs-keyword">when</span> id<span class="hljs-operator">=</span>? <span class="hljs-keyword">then</span> ? <span class="hljs-keyword">end</span> <span class="hljs-keyword">where</span> id <span class="hljs-keyword">in</span> (?,?)<br>[cn.srblog.dao.OrderItemMapper.updateOrderItem]<span class="hljs-operator">-</span><span class="hljs-operator">=</span><span class="hljs-operator">=</span><span class="hljs-operator">></span> Parameters: <span class="hljs-number">1</span>(<span class="hljs-type">Integer</span>), <span class="hljs-number">66</span>(<span class="hljs-type">Integer</span>), <span class="hljs-number">2</span>(<span class="hljs-type">Integer</span>), <span class="hljs-number">5</span>(<span class="hljs-type">Integer</span>),<span class="hljs-number">1</span>(<span class="hljs-type">Integer</span>), <span class="hljs-number">2</span>(<span class="hljs-type">Integer</span>)<br>[cn.srblog.dao.OrderItemMapper.updateOrderItem]<span class="hljs-operator">-</span><span class="hljs-operator"><=</span><span class="hljs-operator">=</span> Updates: <span class="hljs-number">3</span><br></code></pre></td></tr></table></figure>
]]></content>
<tags>
<tag>Mybatis</tag>
<tag>动态SQL</tag>
<tag>ORM</tag>
<tag>SSM</tag>
</tags>
</entry>
<entry>
<title>SSM框架结合LayUi文件上传模块接入COS对象存储服务</title>
<url>/posts/2502e0fe/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/2019.01.05_wx-cos.png'>
<!-- more -->
<h2 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h2><p>在日常项目开发中经常会用到图片，视频等文件存储的操作，但是文件如果一直存放在本地服务器中，可以会导致资源浪费，且访问速度也有所限制，这时我们就会考虑<strong>CDN加速</strong>或<strong>云端存储</strong>等方式来解决问题，这里就要介绍下本文用到的<strong>COS对象存储</strong>-安全稳定、海量、便捷、低延迟、低成本的云端存储服务。</p>
<h3 id="COS对象存储"><a href="#COS对象存储" class="headerlink" title="COS对象存储"></a>COS对象存储</h3><blockquote>
<p>对象存储（Cloud Object Storage，COS）是腾讯云提供的面向非结构化数据，支持 HTTP/HTTPS 协议访问的分布式存储服务，它能容纳海量数据并保证用户对带宽和容量扩充无感知，可以作为大数据计算与分析的数据池。腾讯云 COS 提供网页端管理界面、多种语言的 SDK 以及命令行和图形化工具，并且完全兼容 S3 的 API 接口，方便用户直接使用社区工具和插件，COS 还可以和其他云产品结合，比如利用 CDN 的全球节点提供加速服务，利用数据万象的图片处理能力提供一站式图片解决方案等(<a href="https://cloud.tencent.com/product/cos">详细介绍</a>)</p>
</blockquote>
<h3 id="案例实现"><a href="#案例实现" class="headerlink" title="案例实现"></a>案例实现</h3><ul>
<li>本文使用的是腾讯云提供的COS服务，每个月提供50G存储容量，10G流量，对于一般的博客网站，以及项目测试来说绰绰有余</li>
<li>腾讯云对象存储 COS 除了提供多种 API 接口，还提供了丰富多样的 SDK 供开发者使用，如Java、Python、Js等…，本项目后台基于SpringMVC实现，前端通过LayUi框架的文件上传模块结合实现</li>
<li>存储桶相应的还有<strong>防盗链</strong>设置，<strong>跨域规则</strong>设置，<strong>读写权限</strong>设置，以及相应的<strong>CDN加速</strong>服务<br><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/emoji/2019-01-05%20154723-zx.jpg" alt="www.srblog.cn"></li>
</ul>
<hr>
<h2 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h2><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">package</span> cn.mall.controller.portal;<br><br><span class="hljs-keyword">import</span> cn.mall.common.ServerResponse;<br><span class="hljs-keyword">import</span> cn.mall.util.PropertiesUtil;<br><span class="hljs-keyword">import</span> com.qcloud.cos.COSClient;<br><span class="hljs-keyword">import</span> com.qcloud.cos.ClientConfig;<br><span class="hljs-keyword">import</span> com.qcloud.cos.auth.BasicCOSCredentials;<br><span class="hljs-keyword">import</span> com.qcloud.cos.auth.COSCredentials;<br><span class="hljs-keyword">import</span> com.qcloud.cos.model.PutObjectRequest;<br><span class="hljs-keyword">import</span> com.qcloud.cos.model.PutObjectResult;<br><span class="hljs-keyword">import</span> com.qcloud.cos.region.Region;<br><span class="hljs-keyword">import</span> org.springframework.stereotype.Controller;<br><span class="hljs-keyword">import</span> org.springframework.web.bind.annotation.RequestMapping;<br><span class="hljs-keyword">import</span> org.springframework.web.bind.annotation.RequestMethod;<br><span class="hljs-keyword">import</span> org.springframework.web.bind.annotation.RequestParam;<br><span class="hljs-keyword">import</span> org.springframework.web.bind.annotation.ResponseBody;<br><span class="hljs-keyword">import</span> org.springframework.web.multipart.MultipartFile;<br><br><span class="hljs-keyword">import</span> javax.servlet.http.HttpSession;<br><span class="hljs-keyword">import</span> java.io.File;<br><span class="hljs-keyword">import</span> java.io.IOException;<br><span class="hljs-keyword">import</span> java.util.UUID;<br><br><span class="hljs-meta">@Controller</span><br><span class="hljs-meta">@RequestMapping("/upload/")</span><br><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">UploadController</span> {<br><br> <span class="hljs-comment">//密钥请前往腾讯云后台查询</span><br> <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> String secretId=<span class="hljs-string">"*************"</span>;<br> <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> String secretKey=<span class="hljs-string">"*************"</span>;<br> <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> String bucketName=<span class="hljs-string">"你的存储桶名称"</span>;<br> <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> String RegionName=<span class="hljs-string">"存储桶所属地域"</span>;<br> <span class="hljs-comment">/**</span><br><span class="hljs-comment"> * 文件上传</span><br><span class="hljs-comment"> * <span class="hljs-doctag">@param</span> file</span><br><span class="hljs-comment"> * <span class="hljs-doctag">@param</span> session</span><br><span class="hljs-comment"> * <span class="hljs-doctag">@return</span></span><br><span class="hljs-comment"> */</span><br> <br> <span class="hljs-meta">@RequestMapping(value = "upload_image_cos.do",method = RequestMethod.POST)</span><br> <span class="hljs-meta">@ResponseBody</span><br> <span class="hljs-keyword">public</span> Object <span class="hljs-title function_">Upload</span><span class="hljs-params">(<span class="hljs-meta">@RequestParam(value = "file")</span> MultipartFile file, HttpSession session)</span>{<br> <span class="hljs-keyword">if</span>(file == <span class="hljs-literal">null</span>){<br> <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">UploadMsg</span>(<span class="hljs-number">0</span>,<span class="hljs-string">"文件为空"</span>,<span class="hljs-literal">null</span>);<br> }<br> <span class="hljs-comment">//获取文件上传原名</span><br> <span class="hljs-type">String</span> <span class="hljs-variable">oldFileName</span> <span class="hljs-operator">=</span> file.getOriginalFilename();<br> <span class="hljs-type">String</span> <span class="hljs-variable">eName</span> <span class="hljs-operator">=</span> oldFileName.substring(oldFileName.lastIndexOf(<span class="hljs-string">"."</span>));<br> <span class="hljs-comment">//通过UUID随机生成新的文件名</span><br> <span class="hljs-type">String</span> <span class="hljs-variable">newFileName</span> <span class="hljs-operator">=</span> UUID.randomUUID()+eName;<br> <br> <span class="hljs-comment">// 1 初始化用户身份信息(secretId, secretKey)</span><br> <span class="hljs-type">COSCredentials</span> <span class="hljs-variable">cred</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">BasicCOSCredentials</span>(secretId, secretKey);<br> <span class="hljs-comment">// 2 设置bucket的区域, COS地域的简称请参照 https://cloud.tencent.com/document/product/436/6224</span><br> <span class="hljs-type">ClientConfig</span> <span class="hljs-variable">clientConfig</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">ClientConfig</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Region</span>(RegionName));<br> <span class="hljs-comment">// 3 生成cos客户端</span><br> <span class="hljs-type">COSClient</span> <span class="hljs-variable">cosclient</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">COSClient</span>(cred, clientConfig);<br> <span class="hljs-comment">// bucket的命名规则为{name}-{appid} ，此处填写的存储桶名称必须为此格式</span><br> <span class="hljs-type">String</span> <span class="hljs-variable">bucketName</span> <span class="hljs-operator">=</span> <span class="hljs-built_in">this</span>.bucketName;<br><br> <span class="hljs-comment">// 简单文件上传, 最大支持 5 GB, 适用于小文件上传, 建议 20 M 以下的文件使用该接口</span><br> <span class="hljs-comment">// 大文件上传请参照 API 文档高级 API 上传</span><br> <span class="hljs-type">File</span> <span class="hljs-variable">localFile</span> <span class="hljs-operator">=</span> <span class="hljs-literal">null</span>;<br> <span class="hljs-keyword">try</span> {<br> <span class="hljs-comment">//创建临时文件</span><br> localFile = File.createTempFile(<span class="hljs-string">"temp"</span>,<span class="hljs-literal">null</span>);<br> file.transferTo(localFile);<br> <span class="hljs-comment">// 指定要上传到 COS 上的路径</span><br> <span class="hljs-type">String</span> <span class="hljs-variable">key</span> <span class="hljs-operator">=</span> PropertiesUtil.getProperty(<span class="hljs-string">"cos_key_name"</span>)+newFileName;<br> <span class="hljs-type">PutObjectRequest</span> <span class="hljs-variable">putObjectRequest</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">PutObjectRequest</span>(bucketName, key, localFile);<br> <span class="hljs-type">PutObjectResult</span> <span class="hljs-variable">putObjectResult</span> <span class="hljs-operator">=</span> cosclient.putObject(putObjectRequest);<br> <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">UploadMsg</span>(<span class="hljs-number">1</span>,<span class="hljs-string">"上传成功"</span>, newFileName);<br> } <span class="hljs-keyword">catch</span> (IOException e) {<br> <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">UploadMsg</span>(-<span class="hljs-number">1</span>,e.getMessage(),<span class="hljs-literal">null</span>);<br> } <span class="hljs-keyword">finally</span> {<br> <span class="hljs-comment">// 关闭客户端(关闭后台线程)</span><br> cosclient.shutdown();<br> }<br> }<br><br> <span class="hljs-comment">//自定义JSON消息体</span><br> <span class="hljs-keyword">private</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">UploadMsg</span> {<br> <span class="hljs-keyword">public</span> <span class="hljs-type">int</span> status;<br> <span class="hljs-keyword">public</span> String msg;<br> <span class="hljs-keyword">public</span> String path;<br><br> <span class="hljs-keyword">public</span> <span class="hljs-title function_">UploadMsg</span><span class="hljs-params">()</span> {<br> <span class="hljs-built_in">super</span>();<br> }<br><br> <span class="hljs-keyword">public</span> <span class="hljs-title function_">UploadMsg</span><span class="hljs-params">(<span class="hljs-type">int</span> status, String msg,String path)</span>{<br> <span class="hljs-built_in">this</span>.status =status;<br> <span class="hljs-built_in">this</span>.msg =msg;<br> <span class="hljs-built_in">this</span>.path =path;<br> }<br> }<br><br>}<br><br></code></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="code"><pre><code class="hljs js"><!<span class="hljs-variable constant_">DOCTYPE</span> html><br><html><br><head><br> <meta charset="UTF-8"><br> <meta name="renderer" content="webkit"><br> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><br> <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" /><br> <title>商品添加</title><br> <link rel="stylesheet" href="../assets/layui/css/layui.css"><br><br></head><br><body><br><form class="layui-form column-content-detail"><br><br> <div class="layui-tab-content"><br> <div class="layui-tab-item layui-show"><br> <div class="layui-form-item"><br> <label class="layui-form-label">商品标题：</label><br> <div class="layui-input-block"><br> <input type="text" name="name" required lay-verify="required" placeholder="请输入商品标题" autocomplete="off" class="layui-input"><br> </div><br> </div><br> <div class="layui-form-item"><br> <label class="layui-form-label">分类：</label><br> <div class="layui-input-block"><br> <select name="categoryId" lay-verify="required"><br> <option value="">请选择分类</option><br> <option value="100001">家用电器</option><br> <option value="100002">数码3C</option><br> <option value="100003">服装箱包</option><br> <option value="100004">食品生鲜</option><br> <option value="100005">酒水饮料</option><br> </select><br> </div><br> </div><br> <div class="layui-form-item"><br> <label class="layui-form-label">图像上传：</label><br> <div class="layui-input-block"><br> <img id="upload_img" src="../images/default_img.png" width="100" height="100"><br> <button type="button" class="layui-btn" id="test1"><br> <i class="layui-icon"></i>上传图片<br> </button><br> </div><br> </div><br> <div class="layui-form-item layui-form-text"><br> <label class="layui-form-label">商品介绍：</label><br> <div class="layui-input-block"><br> <textarea class="layui-textarea layui-hide" name="detail" lay-verify="detail" id="LAY_demo_editor"></textarea><br> </div><br> </div><br> <input type="hidden" id="mainImage" name="mainImage" required value="default_img.png" class="layui-input"><br> <input type="hidden" id="status" name="status" value="1" class="layui-input"><br> <div class="layui-form-item"><br> <label class="layui-form-label">商品库存：</label><br> <div class="layui-input-block"><br> <input type="text" name="stock" required lay-verify="number" placeholder="请输入商品库存" autocomplete="off" class="layui-input"><br> </div><br> </div><br> <div class="layui-form-item"><br> <label class="layui-form-label">商品价格：</label><br> <div class="layui-input-block"><br> <input type="text" name="price" required lay-verify="number" placeholder="请输入商品价格" autocomplete="off" class="layui-input"><br> </div><br> </div><br><br> </div><br> </div><br><br> <div class="layui-form-item" style="padding-left: 10px;"><br> <div class="layui-input-block"><br> <button class="layui-btn" lay-submit lay-filter="add_product">立即提交</button><br> <button id="reset" type="reset" class="layui-btn layui-btn-primary">重置</button><br> </div><br> </div><br></form><br><script src="../js/cos-js-sdk-v5.min.js" type="text/javascript" charset="utf-8"></script><br><script src="../js/jquery-1.10.2.js" type="text/javascript" charset="utf-8"></script><br><script src="../assets/layui/layui.all.js"></script><br><script><br> layui.use(['form', 'jquery', 'laydate', 'layer', 'laypage', 'element', 'upload', 'layedit'], function() {<br> var form = layui.form,<br> layer = layui.layer,<br> $ = layui.jquery,<br> laypage = layui.laypage,<br> laydate = layui.laydate,<br> layedit = layui.layedit,<br> element = layui.element,<br> upload=layui.upload;<br><br> //创建一个编辑器<br> var editIndex = layedit.build('LAY_demo_editor', {<br> tool: ['strong' //加粗<br> , 'italic' //斜体<br> , 'underline' //下划线<br> , 'del' //删除线<br> , '|' //分割线<br> , 'left' //左对齐<br> , 'center' //居中对齐<br> , 'right' //右对齐<br> , 'link' //超链接<br> , 'unlink' //清除链接<br> , 'image' //插入图片<br> ],<br> height: 100<br> });<br> <br> var uploadInst = upload.render({<br> elem: '#test1' //绑定元素<br> ,url:'../upload/upload_image_cos.do'//后台上传接口<br> ,before: function(obj){ //obj参数包含的信息，跟 choose回调完全一致，可参见上文。<br> layer.msg('上传中',{icon: 16,time:0,shade:0.01});<br> }<br> ,done: function(res, index, upload){<br> layer.closeAll('loading');<br> //status=1代表上传成功<br> if(res.status == 1){<br> layer.msg("上传成功",{icon:1});<br> //do something （比如将res返回的图片链接保存到表单的隐藏域）<br> $('#upload_img').attr('src','https://sr-1251242863.cos.ap-shanghai.myqcloud.com/webdemo/images/'+res.path);<br> $('#mainImage').val(res.path);<br> }<br><br> //获取当前触发上传的元素，一般用于 elem 绑定 class 的情况，注意：此乃 layui 2.1.0 新增<br> var item = this.item;<br> //文件保存失败<br> //do something<br> }<br> ,error: function(){<br> layer.closeAll('loading');<br> //请求异常回调<br> layer.msg("上传失败，请重试",{icon:2});<br> }<br> ,size:2048 //文件大小限制<br> ,number:1 //文件数量限制<br> ,accept: 'images' //文件类型限制<br> ,acceptMime: 'image/jpg, image/png' //选择窗口属性<br> });<br> });<br></script><br></body><br></html><br></code></pre></td></tr></table></figure>
<h2 id="动图演示"><a href="#动图演示" class="headerlink" title="动图演示"></a>动图演示</h2><p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/gif/2019-0105-10b99e3e-cos.gif" alt="www.srblog.cn"></p>
]]></content>
<categories>
<category>Spring</category>
</categories>
<tags>
<tag>JAVA</tag>
<tag>SSM框架</tag>
<tag>COS对象存储</tag>
<tag>LayUi</tag>
<tag>Spring</tag>
</tags>
</entry>
<entry>
<title>Spring Data JPA 映射VO/DTO对象</title>
<url>/posts/17193f90/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/weixin_title_2019.05.13.png' >
<!-- more -->
<h1 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h1><blockquote>
<p>在项目开发中,时常需要根据业务需求来映射VO/DTO对象(这两个概念理解感觉很模糊- 。- )，本文将简单介绍以Spring Data JPA的方式处理实体类映射</p>
</blockquote>
<h2 id="HQL方式"><a href="#HQL方式" class="headerlink" title="HQL方式"></a>HQL方式</h2><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">public</span> <span class="hljs-keyword">interface</span> <span class="hljs-title class_">MusicTypeRepository</span> <span class="hljs-keyword">extends</span> <span class="hljs-title class_">JpaRepository</span><MusicType,Integer> {<br><br> <span class="hljs-meta">@Query("select new cn.srblog.springbootcurd.vo.StudentTypeInfoVo(count(s.id),m.name) " +</span><br><span class="hljs-meta"> "FROM MusicType m left JOIN Student s on s.musicTypeId = m.id group by m.id ")</span><br> List<StudentTypeInfoVo> <span class="hljs-title function_">getTypeInfo</span><span class="hljs-params">()</span>;<br>}<br><br></code></pre></td></tr></table></figure>
<ul>
<li>填写实体类路径,构造参数顺序要一致,字段名一律为实体类中的属性</li>
<li>如果配置了实体类属性的映射关系，则<code>on s.musicTypeId = m.id</code>语句可以省略</li>
</ul>
<h3 id="VO实体类"><a href="#VO实体类" class="headerlink" title="VO实体类"></a>VO实体类</h3><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-meta">@Value</span><br><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">StudentTypeInfoVo</span> {<br><br> <span class="hljs-keyword">private</span> Long count;<br><br> <span class="hljs-keyword">private</span> String name;<br>}<br><br></code></pre></td></tr></table></figure>
<p>使用<code>Lombok</code>的 <code>@Value</code> 注解</p>
<ul>
<li>默认生成带参构造方法</li>
<li>默认为成员变量添加<code>final</code>修饰,且只提供getter()方法</li>
</ul>
<h2 id="原生SQL的形式"><a href="#原生SQL的形式" class="headerlink" title="原生SQL的形式"></a>原生SQL的形式</h2><h3 id="接口形式"><a href="#接口形式" class="headerlink" title="接口形式"></a>接口形式</h3><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">public</span> <span class="hljs-keyword">interface</span> <span class="hljs-title class_">CoursePlanRepository</span> <span class="hljs-keyword">extends</span> <span class="hljs-title class_">JpaRepository</span><CoursePlan,Integer> {<br><br> <span class="hljs-meta">@Query(nativeQuery = true,value = "SELECT " +</span><br><span class="hljs-meta"> " c.id as id," +</span><br><span class="hljs-meta"> "DAYOFWEEK(c.start_time) as week," +</span><br><span class="hljs-meta"> "m.name as musicType," +</span><br><span class="hljs-meta"> "t.name as teacherName," +</span><br><span class="hljs-meta"> "c.start_time as startTime," +</span><br><span class="hljs-meta"> "c.end_time as endTime " +</span><br><span class="hljs-meta"> " FROM t_courseplan c,t_musictype m , t_teacher t " +</span><br><span class="hljs-meta"> " WHERE DATE(c.start_time) < DATE_ADD(CURDATE(), INTERVAL 7 DAY ) AND CURDATE() <= DATE(c.start_time) " +</span><br><span class="hljs-meta"> " and t.id=c.tea_id and c.music_type_id = m.id order by c.start_time ")</span><br> List<CoursePlanVos> <span class="hljs-title function_">getWeekList</span><span class="hljs-params">()</span>;<br><br>}<br></code></pre></td></tr></table></figure>
<ul>
<li>nativeQuery = true 表示开启原生SQL查询</li>
<li>查询字段别名需要与实体类中字段一一对应</li>
<li>该方法功能为查询一周后的数据</li>
</ul>
<table>
<thead>
<tr>
<th>函数</th>
<th>说明</th>
</tr>
</thead>
<tbody><tr>
<td>DAYOFWEEK()</td>
<td>DAYOFWEEK函数返回日期的工作日索引值，即星期日为1，星期一为2，星期六为7。例:<code>DAYOFWEEK('2019-05-09')</code> 返回 <code>5</code></td>
</tr>
<tr>
<td>DATE()</td>
<td>提取日期或日期/时间表达式的日期部分,格式<code>'YYYY-MM-DD'</code>或者<code>'YYYYMMDD'</code></td>
</tr>
<tr>
<td>DATE_ADD(date,INTERVAL expr unit)</td>
<td>给日期添加指定的时间间隔。date 参数是合法的日期表达式,expr 参数是您希望添加的时间间隔,type 参数可以是MySQL支持的时间日期相关类型值</td>
</tr>
<tr>
<td>CURDATE()</td>
<td>返回当前日期 例:<code>'2019-05-09'</code></td>
</tr>
</tbody></table>
<h4 id="VO实体类-接口形式"><a href="#VO实体类-接口形式" class="headerlink" title="VO实体类(接口形式)"></a>VO实体类(接口形式)</h4><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">public</span> <span class="hljs-keyword">interface</span> <span class="hljs-title class_">CoursePlanVos</span>{<br><br> Integer <span class="hljs-title function_">getId</span><span class="hljs-params">()</span>;<br><br> Integer <span class="hljs-title function_">getWeek</span><span class="hljs-params">()</span>;<br><br> String <span class="hljs-title function_">getMusicType</span><span class="hljs-params">()</span>;<br><br> String <span class="hljs-title function_">getTeacherName</span><span class="hljs-params">()</span>;<br><br> Date <span class="hljs-title function_">getStartTime</span><span class="hljs-params">()</span> ;<br><br> Date <span class="hljs-title function_">getEndTime</span><span class="hljs-params">()</span>;<br>}<br></code></pre></td></tr></table></figure>
<h3 id="结果集形式"><a href="#结果集形式" class="headerlink" title="结果集形式"></a>结果集形式</h3><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-meta">@Query(value = "select count(s.id) as count,m.name as name " +</span><br><span class="hljs-meta"> " FROM t_musictype m left JOIN t_student s on s.music_type_id = m.id group by m.id ",nativeQuery = true)</span><br> List<Object[]> listType1();<br></code></pre></td></tr></table></figure>
<p>对比第一种方法,使用原生SQL默认会返回Object数组</p>
]]></content>
<categories>
<category>Spring</category>
</categories>
<tags>
<tag>Spring Data JPA</tag>
<tag>VO</tag>
<tag>HQL</tag>
</tags>
</entry>
<entry>
<title>Spring框架入门(一):概念简介</title>
<url>/posts/f9407374/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/wx_title_2018.10.30.png'>
<!-- more -->
<blockquote>
<p><strong>简介</strong></p>
</blockquote>
<p>Spring 是一个开源的轻量级 Java SE（ Java 标准版本）/Java EE（ Java 企业版本）开发应用框架，其目的是用于简化企业级应用程序开发。Spring容器通过反转控制( IoC )和依赖注入( DI )来实现高内聚、低耦合的应用。除此之外它可以整合很多第三方框架，它还提供面向切面编程（ AOP ）的能力，对通用任务如安全、事务、日志等进行集中式管理</p>
<blockquote>
<p><strong>概念介绍</strong></p>
</blockquote>
<ul>
<li>框架：能完成一定功能的半成品，比如我们可以使用框架进行购物网站开发；框架做一部分功能，我们自己做一部分功能，辅助高效工作。而且框架规定了你在开发应用程序时的整体架构，提供了一些基础功能，还规定了类和对象的如何创建、如何协作等，从而简化我们的代码编写，让我们专注于业务逻辑开发。</li>
<li>非侵入式设计：从框架角度可以这样理解，无需继承框架提供的类，这种设计就可以看作是非侵入式设计，如果继承了这些框架类，就是侵入设计，如果以后想更换框架，之前写过的代码几乎无法重用，如果非侵入式设计则之前写过的代码仍然可以继续使用。</li>
<li>轻量级与重量级：轻量级是相对于重量级而言的，轻量级一般就是非入侵性的、所依赖的东西非常少、资源占用非常少、部署简单等等，其实就是比较容易使用，而重量级正好相反。</li>
<li>POJO ： POJO （ Plain Ordinary Java Object ）简单的 Java 对象。它可以包含业务逻辑或持久化逻辑，但不担当任何特殊角色且不继承或不实现任何其它 Java 框架的类或接口。</li>
<li>容器：在日常生活中容器就是一种盛放东西的器具，从程序设计角度看就是装对象的的对象，因为存在放入、拿出等操作，所以容器还要管理对象的生命周期。</li>
<li>控制反转：即 Inversion of Control ，缩写为 IoC ，控制反转还有一个名字叫做依赖注入（ Dependency Injection ），就是由容器控制程序之间的关系，而非传统实现中，由程序代码直接操控。</li>
<li>Bean ：一般指容器管理对象，在 Spring 中指 Spring IoC 容器管理对象。</li>
</ul>
<blockquote>
<p><strong>优点</strong></p>
</blockquote>
<ul>
<li>低侵入式设计，代码的污染极低。</li>
<li>独立于各种应用服务器，基于Spring框架的应用，可以真正实现Write Once，Run Anywhere的承诺。</li>
<li>Spring的IoC容器降低了业务对象替换的复杂性，提高了组件之间的解耦。</li>
<li>Spring的AOP支持允许将一些通用任务如安全、事务、日志等进行集中式管理，从而提供了更好的复用。</li>
<li>Spring的ORM和DAO提供了与第三方持久层框架的良好整合，并简化了底层的数据库访问。</li>
<li>Spring的高度开放性，并不强制应用完全依赖于Spring，开发者可自由选用Spring框架的部分或全部。</li>
</ul>
<blockquote>
<p><strong>架构图</strong></p>
</blockquote>
<p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/spring_frameword.png"><br><strong>核心容器：包括 Core 、 Beans 、 Context 、 EL 模块</strong></p>
<ul>
<li>Core 模块：封装了框架依赖的最底层部分，包括资源访问、类型转换及一些常用工具类。</li>
<li>Beans 模块：提供了框架的基础部分，包括控制反转（ IOC ）和依赖注入（ DI ）。其中 BeanFactory 是容器核心，本质是“工厂设计模式”的实现，而且无需编程实现“单例设计模式”，单例完全由容器控制，而且提倡面向接口编程，而非面向实现编程；所有应用程序对象及对象间关系由框架管理，从而真正从程序逻辑中把维护对象之间的依赖关系提取出来，所有这些依赖关系都由 BeanFactory 来维护。</li>
<li>Context 模块：以 Core 和 Beans 为基础，集成 Beans 模块功能并添加资源绑定、数据验证、国际化、 Java EE 支持、容器生命周期、事件传播等；核心接口是 ApplicationContext 。</li>
<li>EL 模块：提供强大的表达式语言支持，支持访问和修改属性值，方法调用，支持访问及修改数组、容器和索引器，命名变量，支持算数和逻辑运算，支持从 Spring 容器获取 Bean， 它也支持列表投影、选择和一般的列表聚合等。</li>
</ul>
<hr>
<ul>
<li>AOP 模块： Spring AOP 模块提供了符合 AOP Alliance 规范的面向切面的编程（ aspect-oriented programming ）实现，提供比如日志记录、权限控制、性能统计等通用功能和业务逻辑分离的技术，并且能动态的把这些功能添加到需要的代码中；这样各专其职，降低业务逻辑和通用功能的耦合。<br>-Aspects 模块：提供了对 AspectJ 的集成，AspectJ 提供了比 Spring ASP 更强大的功能。</li>
<li>数据访问/集成模块：该模块包括了 JDBC 、 ORM 、 OXM 、 JMS 和事务管理。<br>事务模块：该模块用于 Spring 管理事务，只要是 Spring 管理对象都能得到 Spring 管理事务的好处，无需在代码中进行事务控制了，而且支持编程和声明性的事务管理。</li>
<li>JDBC 模块：提供了一个 JBDC 的样例模板，使用这些模板能消除传统冗长的 JDBC 编码还有必须的事务控制，而且能享受到 Spring 管理事务的好处。<br>ORM 模块：提供与流行的“对象-关系”映射框架的无缝集成，包括 Hibernate 、JPA 、 MyBatis 等。而且可以使用 Spring 事务管理，无需额外控制事务。<br>OXM 模块：提供了一个对 Object / XML 映射实现，将 java 对象映射成 XML 数据，或者将 XML 数据映射成 java 对象， Object / XML 映射实现包括 JAXB 、 Castor 、 XMLBeans 和 XStream 。</li>
<li>JMS 模块：用于 JMS ( Java Messaging Service )，提供一套 “消息生产者、消息消费者”模板用于更加简单的使用 JMS ， JMS 用于用于在两个应用程序之间，或分布式系统中发送消息，进行异步通信。</li>
<li>Web / Remoting 模块： Web / Remoting 模块包含了 Web 、 Web-Servlet 、 Web-Struts 、 Web-Porlet 模块。</li>
<li>Web 模块：提供了基础的 web 功能。例如多文件上传、集成 IoC 容器、远程过程访问（ RMI 、Hessian 、 Burlap ）以及 Web Service 支持，并提供一个 RestTemplate 类来提供方便的 Restful services 访问。<br>Web-Servlet 模块：提供了一个 Spring MVC Web 框架实现。Spring MVC 框架提供了基于注解的请求资源注入、更简单的数据绑定、数据验证等及一套非常易用的 JSP 标签，完全无缝与 Spring 其他技术协作。</li>
<li>Web-Struts 模块：提供了与 Struts 无缝集成， Struts1.x 和 Struts2.x 都支持。</li>
<li>Test 模块： Spring 支持 Junit 和 TestNG 测试框架，而且还额外提供了一些基于 Spring 的测试功能，比如在测试 Web 框架时，模拟 Http 请求的功能。</li>
</ul>
<hr>
]]></content>
<categories>
<category>Spring</category>
</categories>
<tags>
<tag>Spring</tag>
</tags>
</entry>
<entry>
<title>Spring框架入门(三):依赖注入和控制反转</title>
<url>/posts/2d0cab43/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/spring3_2018.10.31.png' >
<!-- more -->
<h1 id="依赖注入和控制反转概念"><a href="#依赖注入和控制反转概念" class="headerlink" title="依赖注入和控制反转概念"></a>依赖注入和控制反转概念</h1><p>依赖注入(IoC) 和 控制反转(DI) 有什么关系呢？其实它们是同一个概念的不同角度描述。</p>
<h2 id="依赖注入-Dependency-injection"><a href="#依赖注入-Dependency-injection" class="headerlink" title="依赖注入(Dependency injection)"></a>依赖注入(Dependency injection)</h2><blockquote>
<p>是指应用在运行期，由外部容器（Spring容器）动态地将依赖对象注入到另一个对象中。</p>
</blockquote>
<p>理解 DI 的关键是：<font color="red">“谁依赖谁，为什么需要依赖，谁注入谁，注入了什么”</font>：</p>
<ul>
<li>谁依赖于谁：当然是某个容器管理对象依赖于 IoC 容器；“被注入对象的对象”依赖于“依赖对象”；</li>
<li>为什么需要依赖：容器管理对象需要 IoC 容器来提供对象需要的外部资源；</li>
<li>谁注入谁：很明显是 IoC 容器注入某个对象，也就是注入“依赖对象”；</li>
<li>注入了什么：就是注入某个对象所需要的外部资源（包括对象、资源、常量数据）。</li>
</ul>
<h2 id="控制反转-Inversion-Of-Control"><a href="#控制反转-Inversion-Of-Control" class="headerlink" title="控制反转(Inversion Of Control)"></a>控制反转(Inversion Of Control)</h2><blockquote>
<p>IoC 容器就是具有依赖注入功能的容器，IoC 容器负责实例化、定位、配置应用程序中的对象及建立这些对象间的依赖。应用程序无需直接在代码中 new 相关的对象，应用程序由 IoC 容器进行组装。</p>
</blockquote>
<h3 id="在传统模式下通常有两种做法："><a href="#在传统模式下通常有两种做法：" class="headerlink" title="在传统模式下通常有两种做法："></a>在传统模式下通常有两种做法：</h3><ul>
<li>原始做法: 调用者主动创建被依赖对象，然后再调用被依赖对象的方法。</li>
<li>简单工厂模式: 调用者先找到被依赖对象的工厂，然后主动通过工厂去获取被依赖对象，最后再调用被依赖对象的方法。</li>
</ul>
<h3 id="Spring容器的依赖注入"><a href="#Spring容器的依赖注入" class="headerlink" title="Spring容器的依赖注入"></a>Spring容器的依赖注入</h3><ul>
<li>设值注入：是指IoC容器通过成员变量的setter方法来注入被依赖对象。这种注入方式简单、直观，因而在Spring的依赖注入里大量使用。</li>
<li>构造注入：利用构造器来设置依赖关系的方式，被称为构造注入。通过构造器参数对成员变量执行初始化，驱动Spring在底层以反射方式执行带指定参数的构造器。</li>
</ul>
<p><strong>注意：</strong> 建议采用设值注入为主，构造注入为辅的注入策略。对于依赖关系无须变化的注入，尽量采用构造注入；而其他依赖关系的注入，则考虑采用设值注入。</p>
<h3 id="实例"><a href="#实例" class="headerlink" title="实例"></a>实例</h3><figure class="highlight xml"><table><tr><td class="code"><pre><code class="hljs xml"><span class="hljs-comment"><!-- 通过property属性注入（必须提供set方法） --></span><br><span class="hljs-tag"><<span class="hljs-name">bean</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"user"</span> <span class="hljs-attr">class</span>=<span class="hljs-string">"cn.sr.spring.javabean.User"</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"name"</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"张三"</span>></span><span class="hljs-tag"></<span class="hljs-name">property</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"password"</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"123456"</span>></span><span class="hljs-tag"></<span class="hljs-name">property</span>></span><br><span class="hljs-tag"></<span class="hljs-name">bean</span>></span><br><br><span class="hljs-comment"><!-- 通过构造函数注入 --></span><br><span class="hljs-tag"><<span class="hljs-name">bean</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"user"</span> <span class="hljs-attr">class</span>=<span class="hljs-string">"cn.sr.spring.javabean.User"</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">constructor-arg</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"name"</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"张三"</span>></span><span class="hljs-tag"></<span class="hljs-name">constructor-arg</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">constructor-arg</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"password"</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"123456"</span>></span><span class="hljs-tag"></<span class="hljs-name">constructor-arg</span>></span><br><span class="hljs-tag"></<span class="hljs-name">bean</span>></span><br><br>//除此之外还可以注入集合类型的对象，List、Set、Map、Properties……<br><br></code></pre></td></tr></table></figure>
<h1 id="Spring容器中的Bean"><a href="#Spring容器中的Bean" class="headerlink" title="Spring容器中的Bean"></a>Spring容器中的Bean</h1><blockquote>
<p>对于开发者来说，开发者使用Spring框架主要是做两件事：①开发Bean；②配置Bean。对于Spring框架来说，它要做的就是根据配置文件来创建Bean实例，并调用Bean实例的方法完成”依赖注入”——这就是所谓IoC的本质。</p>
</blockquote>
<h2 id="容器中Bean的作用域"><a href="#容器中Bean的作用域" class="headerlink" title="容器中Bean的作用域"></a>容器中Bean的作用域</h2><p>当通过Spring容器创建一个Bean实例时，不仅可以完成Bean实例的实例化，还可以为Bean指定特定的作用域。Spring支持如下五种作用域：</p>
<ul>
<li>singleton: 单例模式，在整个Spring IoC容器中，singleton作用域的Bean将只生成一个实例。</li>
<li>prototype: 每次通过容器的getBean()方法获取prototype作用域的Bean时，都将产生一个新的Bean实例。</li>
<li>request: 对于一次HTTP请求，request作用域的Bean将只生成一个实例，这意味着，在同一次HTTP请求内，程序每次请求该Bean，得到的总是同一个实例。只有在Web应用中使用Spring时，该作用域才真正有效。</li>
<li>session：该作用域将 bean 的定义限制为 HTTP 会话。 只在web-aware Spring ApplicationContext的上下文中有效。</li>
<li>global session: 每个全局的HTTP Session对应一个Bean实例。在典型的情况下，仅在使用portlet context的时候有效，同样只在Web应用中有效。</li>
</ul>
<h3 id="配置格式如下："><a href="#配置格式如下：" class="headerlink" title="配置格式如下："></a>配置格式如下：</h3><figure class="highlight xml"><table><tr><td class="code"><pre><code class="hljs xml"><span class="hljs-tag"><<span class="hljs-name">bean</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"…"</span> <span class="hljs-attr">class</span>=<span class="hljs-string">"…"</span> <span class="hljs-attr">scope</span>=<span class="hljs-string">"singleton"</span>></span><span class="hljs-tag"></<span class="hljs-name">bean</span>></span><br></code></pre></td></tr></table></figure>
<blockquote>
<p>如果不指定Bean的作用域，Spring默认使用singleton作用域。prototype作用域的Bean的创建、销毁代价比较大。而singleton作用域的Bean实例一旦创建成果，就可以重复使用。因此，应该尽量避免将Bean设置成prototype作用域。</p>
</blockquote>
<h2 id="创建Bean的3种方式"><a href="#创建Bean的3种方式" class="headerlink" title="创建Bean的3种方式"></a>创建Bean的3种方式</h2><ol>
<li>使用构造器创建Bean实例:<br>需要提供无参数的构造器,Spring对Bean实例的所有属性执行默认初始化，即所有的基本类型的值初始化为0或false；所有的引用类型的值初始化为null。</li>
<li>使用静态工厂方法创建Bean:<br>class属性须指定静态工厂类，使用factory-method属性来指定静态工厂方法，如果静态工厂方法需要参数，则使用<constructor-arg…/>元素指定静态工厂方法的参数。</li>
</ol>
<figure class="highlight xml"><table><tr><td class="code"><pre><code class="hljs xml"><span class="hljs-tag"><<span class="hljs-name">bean</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"user"</span> <span class="hljs-attr">class</span>=<span class="hljs-string">"cn.sr.spring.javabean.UserFactory"</span> <span class="hljs-attr">factory-mothod</span>=<span class="hljs-string">"getUser"</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">constructor-arg</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"name"</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"张三"</span>></span><span class="hljs-tag"></<span class="hljs-name">constructor-arg</span>></span><br><span class="hljs-tag"></<span class="hljs-name">bean</span>></span><br></code></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">package</span> cn.sr.spring.javabean;<br><br><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">UserFactory</span> {<br> <span class="hljs-comment">//对应factory-method</span><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">getUser</span><span class="hljs-params">(String name)</span> {<br> System.out.println(<span class="hljs-string">"这是"</span>+name);<br> }<br>}<br></code></pre></td></tr></table></figure>
<ol start="3">
<li>使用实例工厂方法创建Bean:</li>
</ol>
<ul>
<li>factory-bean指定工厂实例</li>
<li>factory-method指定实例工厂的工厂方法。</li>
<li></li>
</ul>
<p>若调用实例工厂方法时需要传入参数，则使用<constructor-arg…/>元素确定参数值。</p>
<figure class="highlight xml"><table><tr><td class="code"><pre><code class="hljs xml"><span class="hljs-tag"><<span class="hljs-name">bean</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"userFactory"</span> <span class="hljs-attr">class</span>=<span class="hljs-string">"cn.sr.spring.javabean.UserFactory"</span> /></span><br>//此时getUser方法应为非静态<br><span class="hljs-tag"><<span class="hljs-name">bean</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"user"</span> <span class="hljs-attr">factory-bean</span>=<span class="hljs-string">"userFactory"</span> <span class="hljs-attr">factory-mothod</span>=<span class="hljs-string">"getUser"</span>></span><br> <span class="hljs-tag"><<span class="hljs-name">constructor-arg</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"name"</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"张三"</span>></span><span class="hljs-tag"></<span class="hljs-name">constructor-arg</span>></span><br><span class="hljs-tag"></<span class="hljs-name">bean</span>></span><br></code></pre></td></tr></table></figure>
<h2 id="Bean的生命周期"><a href="#Bean的生命周期" class="headerlink" title="Bean的生命周期"></a>Bean的生命周期</h2><p>这里简单的说明一下，对于作用域为prototype的Bean，Spring在仅仅负责创建Bean，每当容器创建Bean后就交给客户端的代码进行维护。但是对应singlton作用域的Bean，Spring会进行创建一次，然后整个容器中共享。所以Spring容器会负责进行跟踪其状态,负责依赖的注入和依赖实例的分配。</p>
<hr>
<h1 id="结尾"><a href="#结尾" class="headerlink" title="结尾"></a>结尾</h1><p>本文只是做简单介绍，个人理解方面偏多，更多有关于IOC和DI以及Bean对象的详解介绍请自行查找相关资料！</p>
]]></content>
<categories>
<category>Spring</category>
</categories>
<tags>
<tag>Spring</tag>
<tag>Java EE</tag>
</tags>
</entry>
<entry>
<title>Spring框架入门(二):安装配置</title>
<url>/posts/1df93bf0/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/wx_title2_2018.10.30.png' >
<span id="more"></span>
<blockquote>
<h5 id="下载架包"><a href="#下载架包" class="headerlink" title="下载架包"></a>下载架包</h5></blockquote>
<p>这里以4.3.20版本为例，点击下载:<a href="http://repo.spring.io/release/org/springframework/spring/4.3.20.RELEASE/spring-framework-4.3.20.RELEASE-dist.zip">SpringFramewoek 4.3.20版本</a></p>
<hr>
<h6 id="解压缩后目录"><a href="#解压缩后目录" class="headerlink" title="解压缩后目录:"></a>解压缩后目录:</h6><p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/20181030144323.png" alt="解压缩"></p>
<p>— docs目录为api和开发文档介绍，schema目录为配置xml的schema约束文件，libs文件夹中为我们要使用的架包<br><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/lib20181030144732.png" alt="在这里插入图片描述"><br><strong><font color=red size=3>注意：</font>另外还要下载spring的依赖架包:</strong> <a href="http://mirrors.shu.edu.cn/apache//commons/logging/binaries/commons-logging-1.2-bin.zip">commons-logging</a></p>
<hr>
<blockquote>
<h5 id="安装"><a href="#安装" class="headerlink" title="安装"></a>安装</h5></blockquote>
<h6 id="1-打开IDE工具，新建项目，导入上文下载好的架包"><a href="#1-打开IDE工具，新建项目，导入上文下载好的架包" class="headerlink" title="1. 打开IDE工具，新建项目，导入上文下载好的架包"></a>1. 打开IDE工具，新建项目，导入上文下载好的架包</h6><p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/prolibs20181030154520.png" alt="导入项目"></p>
<h6 id="2-创建实体类并意添加一个方法打印输入"><a href="#2-创建实体类并意添加一个方法打印输入" class="headerlink" title="2. 创建实体类并意添加一个方法打印输入"></a>2. 创建实体类并意添加一个方法打印输入</h6><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">package</span> cn.sr.spring;<br><br><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">User</span> {<br><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">isSelf</span><span class="hljs-params">()</span> {<br> System.out.println(<span class="hljs-string">"我是谁，我在哪，我在干什么"</span>);<br> }<br><br>}<br></code></pre></td></tr></table></figure>
<h6 id="3-在src目录下-创建xml文件"><a href="#3-在src目录下-创建xml文件" class="headerlink" title="3. 在src目录下 创建xml文件"></a>3. 在src目录下 创建xml文件</h6><figure class="highlight xml"><table><tr><td class="code"><pre><code class="hljs xml"><span class="hljs-meta"><?xml version=<span class="hljs-string">"1.0"</span> encoding=<span class="hljs-string">"UTF-8"</span>?></span><br><span class="hljs-tag"><<span class="hljs-name">beans</span> <span class="hljs-attr">xmlns</span>=<span class="hljs-string">"http://www.springframework.org/schema/beans"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">xmlns:xsi</span>=<span class="hljs-string">"http://www.w3.org/2001/XMLSchema-instance"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">xsi:schemaLocation</span>=<span class="hljs-string">"http://www.springframework.org/schema/beans</span></span><br><span class="hljs-string"><span class="hljs-tag"> http://www.springframework.org/schema/beans/spring-beans.xsd"</span>></span><br> <span class="hljs-comment"><!-- 配置javabean对象 --></span><br> <span class="hljs-tag"><<span class="hljs-name">bean</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"user"</span> <span class="hljs-attr">class</span>=<span class="hljs-string">"cn.sr.spring.User"</span>></span><span class="hljs-tag"></<span class="hljs-name">bean</span>></span><br><span class="hljs-tag"></<span class="hljs-name">beans</span>></span><br></code></pre></td></tr></table></figure>
<h6 id="4-创建测试类"><a href="#4-创建测试类" class="headerlink" title="4. 创建测试类"></a>4. 创建测试类</h6><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">package</span> cn.sr.spring;<br><span class="hljs-keyword">import</span> org.springframework.context.ApplicationContext;<br><span class="hljs-keyword">import</span> org.springframework.context.support.ClassPathXmlApplicationContext;<br><span class="hljs-keyword">import</span> org.junit.*;<br><br><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">TestBean</span> {<br><br> <span class="hljs-meta">@Test</span><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">test</span><span class="hljs-params">()</span> {<br> <span class="hljs-comment">//通过xml文件获取Spring的上下文对象</span><br> <span class="hljs-type">ApplicationContext</span> <span class="hljs-variable">context</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">ClassPathXmlApplicationContext</span>(<span class="hljs-string">"beans.xml"</span>);<br> <span class="hljs-comment">//通过id获取Spring管理的JavaBean对象</span><br> <span class="hljs-type">User</span> <span class="hljs-variable">user</span> <span class="hljs-operator">=</span> (User) context.getBean(<span class="hljs-string">"user"</span>);<br> System.out.println(user);<br> user.isSelf();<br> }<br><br>}<br></code></pre></td></tr></table></figure>
<blockquote>
<h5 id="配置完成"><a href="#配置完成" class="headerlink" title="配置完成"></a>配置完成</h5></blockquote>
<p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/prolibs.png"></p>
<p>如图所示，即配置成功。</p>
<hr>
]]></content>
<categories>
<category>Spring</category>
</categories>
<tags>
<tag>Spring</tag>
</tags>
</entry>
<entry>
<title>Tomcat服务器配置Https协议</title>
<url>/posts/8baea545/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/wx_title_2019.04.25.png'>
<!-- more -->
<h3 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h3><blockquote>
<p>日常开发项目时,一般本机都是基于http协议,但是要实现某些需求必须要开启https协议。<br>现在https协议已经成为主流,网站如果未开启https协议,浏览器会进行安全提示。<br>本文以<strong>Tomcat</strong>服务器为例,简单介绍如何在<strong>本机开发环境</strong>配置https协议</p>
</blockquote>
<h3 id="证书生成"><a href="#证书生成" class="headerlink" title="证书生成"></a>证书生成</h3><p><strong>使用JDK自带的keytool工具来生成证书库</strong>：</p>
<figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java">keytool -genkeypair -alias <span class="hljs-string">"tomcat"</span> -keyalg <span class="hljs-string">"RSA"</span> -keystore <span class="hljs-string">"d:\https\tomcat.keystore"</span> <br></code></pre></td></tr></table></figure>
<p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/2019-4-25-https1.png"></p>
<table>
<thead>
<tr>
<th>属性</th>
<th>说明</th>
</tr>
</thead>
<tbody><tr>
<td>alias</td>
<td>证书别名</td>
</tr>
<tr>
<td>keyalg</td>
<td>加密算法,RSA</td>
</tr>
<tr>
<td>keystore</td>
<td>证书保存路径</td>
</tr>
</tbody></table>
<h3 id="环境设置"><a href="#环境设置" class="headerlink" title="环境设置"></a>环境设置</h3><p><strong>修改Tomcat配置文件</strong>：<br>打开Tomcat安装目录/conf/server.xml,修改如下配置,并取消注释<br>注：这里以Tomcat8.0为例,8.5以上配置请另行百度</p>
<figure class="highlight xml"><table><tr><td class="code"><pre><code class="hljs xml"><span class="hljs-tag"><<span class="hljs-name">Connector</span> <span class="hljs-attr">port</span>=<span class="hljs-string">"8443"</span> <span class="hljs-attr">protocol</span>=<span class="hljs-string">"org.apache.coyote.http11.Http11NioProtocol"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">maxThreads</span>=<span class="hljs-string">"150"</span> <span class="hljs-attr">SSLEnabled</span>=<span class="hljs-string">"true"</span> <span class="hljs-attr">scheme</span>=<span class="hljs-string">"https"</span> <span class="hljs-attr">secure</span>=<span class="hljs-string">"true"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">clientAuth</span>=<span class="hljs-string">"false"</span> <span class="hljs-attr">sslProtocol</span>=<span class="hljs-string">"TLS"</span></span><br><span class="hljs-tag"> <span class="hljs-attr">keystoreFile</span>=<span class="hljs-string">"d:\https\tomcat.keystore"</span> <span class="hljs-attr">keystorePass</span>=<span class="hljs-string">"123456"</span> /></span><br></code></pre></td></tr></table></figure>
<h3 id="启动Tomcat"><a href="#启动Tomcat" class="headerlink" title="启动Tomcat"></a>启动Tomcat</h3><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java">https:<span class="hljs-comment">//localhost:8443/</span><br></code></pre></td></tr></table></figure>
<p>访问链接,浏览器会提示站点不安全，点击继续访问即可(<strong>本地安装证书</strong>或者<strong>互联网申请证书解决</strong>)<br><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/2019-4-25-https2.png" alt="在这里插入图片描述"></p>
]]></content>
<tags>
<tag>Tomcat</tag>
</tags>
</entry>
<entry>
<title>Hello World</title>
<url>/posts/4a17b156/</url>
<content><![CDATA[<h3 id="永远相信美好的事情即将发生"><a href="#永远相信美好的事情即将发生" class="headerlink" title="永远相信美好的事情即将发生~"></a>永远相信美好的事情即将发生~</h3>]]></content>
</entry>
<entry>
<title>一段Js代码开启任意网站的匿名聊天室</title>
<url>/posts/ccb2c90f/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/blog_chart_2018.12.05.png'>
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<h2 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h2><p>一个’神奇’的在线聊天室 (<a href="http://www.topurl.cn/">http://www.topurl.cn/</a>)</p>
<h2 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h2><ol>
<li>浏览器控制台输入</li>
</ol>
<figure class="highlight js"><table><tr><td class="code"><pre><code class="hljs js"><span class="hljs-keyword">var</span> s=<span class="hljs-variable language_">document</span>.<span class="hljs-title function_">createElement</span>(<span class="hljs-string">'script'</span>);<br>s.<span class="hljs-property">src</span>=<span class="hljs-string">'//topurl.cn/chat.js'</span>;<br><span class="hljs-variable language_">document</span>.<span class="hljs-property">body</span>.<span class="hljs-title function_">append</span>(s);<br></code></pre></td></tr></table></figure>
<ol start="2">
<li>地址栏输入</li>
</ol>
<figure class="highlight js"><table><tr><td class="code"><pre><code class="hljs js"><span class="hljs-attr">javascript</span>:<span class="hljs-keyword">var</span> s=<span class="hljs-variable language_">document</span>.<span class="hljs-title function_">createElement</span>(<span class="hljs-string">'script'</span>);s.<span class="hljs-property">src</span>=<span class="hljs-string">'//topurl.cn/chat.js'</span>;<span class="hljs-variable language_">document</span>.<span class="hljs-property">body</span>.<span class="hljs-title function_">append</span>(s);<br></code></pre></td></tr></table></figure>
<ol start="3">
<li>书签<br>地址为方法2中的代码</li>
</ol>
<h2 id="动图演示"><a href="#动图演示" class="headerlink" title="动图演示"></a>动图演示</h2><p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/gif/blog_chart_2018.12.05.gif"></p>
]]></content>
<tags>
<tag>JS</tag>
<tag>聊天室</tag>
</tags>
</entry>
<entry>
<title>回忆清单之情景喜剧篇</title>
<url>/posts/7a9127ac/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/sitcom.png' >
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<h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><p>听《活着》时,我突然想起了《废柴兄弟》这部电视剧,以及剧中许之一、张晓蛟的形象。从过去的“废柴”,到现在的“摆烂”青年,一切周而复始。紧接着《屌丝男士》、《麻辣隔壁》等作品中的片段也浮现在我脑海里,从那些方方正正的屏幕中涌现出来。曾经我们也聚在一起,以这些剧情为话题沟通交流，汇聚成自己的故事。但是世界仿佛是一个巨大的圆环,我们每个人是一个小圆环，随着时间渐行渐远,有些圆环即使怎样翻滚变化,也再难与之产生交集。<br>好了，不絮叨了。下面整理了一下曾经我看过的电视剧（我也不知道怎么分类，就暂且都认为是情景喜剧吧），虽然以后可能没机会再完整的看一遍了，但是想起时去看看片段，还是会很开心的。</p>
<h2 id="清单"><a href="#清单" class="headerlink" title="清单"></a>清单</h2><blockquote>
<p>我尽量以时间前后排序，虽然我也不知道对不对，哈哈</p>
</blockquote>
<h3 id="星际精灵蓝多多"><a href="#星际精灵蓝多多" class="headerlink" title="星际精灵蓝多多"></a>星际精灵蓝多多</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405155908857.png" style="zoom: 50%;" /></td>
<td align="center">蔡小豆<br />蓝多多<br />唐古拉<br />唐古丽<br />包大雷<br />黑心博士<br /></td>
</tr>
</tbody></table>
<h3 id="家有外星人"><a href="#家有外星人" class="headerlink" title="家有外星人"></a>家有外星人</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405160133844.png" style="zoom: 50%;" /></td>
<td align="center">唐不苦<br />唐朝<br />美丽果<br />可儿<br /></td>
</tr>
</tbody></table>
<h3 id="淘气包马小跳"><a href="#淘气包马小跳" class="headerlink" title="淘气包马小跳"></a>淘气包马小跳</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405163155427.png" style="zoom: 33%;" /></td>
<td align="center">马小跳<br />马天笑<br />丁蕊<br />丁克<br />姥爷<br /></td>
</tr>
</tbody></table>
<h3 id="家有儿女"><a href="#家有儿女" class="headerlink" title="家有儿女"></a>家有儿女</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405161244158.png" style="zoom: 50%;" /></td>
<td align="center">夏东海<br />刘梅<br />夏雪<br />夏雨<br />刘星<br />胡一统<br />键盘<br />鼠标<br /></td>
</tr>
</tbody></table>
<h3 id="疯丫头"><a href="#疯丫头" class="headerlink" title="疯丫头"></a>疯丫头</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405163010525.png" style="zoom:33%;" /></td>
<td align="center">雪儿<br />糖糖<br />爆米花<br /></td>
</tr>
</tbody></table>
<h3 id="粉红女郎"><a href="#粉红女郎" class="headerlink" title="粉红女郎"></a>粉红女郎</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405163353644.png" style="zoom: 50%;" /></td>
<td align="center">方小萍<br />万人迷<br />哈妹<br />罗密欧<br /> 龚喜<br />何茹男<br /></td>
</tr>
</tbody></table>
<h3 id="炊事班的故事"><a href="#炊事班的故事" class="headerlink" title="炊事班的故事"></a>炊事班的故事</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405163832435.png" style="zoom:33%;" /></td>
<td align="center">小毛<br />胖洪<br />大周<br />小姜<br />老高<br />连长<br /></td>
</tr>
</tbody></table>
<h3 id="武林外传"><a href="#武林外传" class="headerlink" title="武林外传"></a>武林外传</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405164222944.png" style="zoom:33%;" /></td>
<td align="center">白展堂<br />佟湘玉<br />李大嘴<br />吕轻侯<br />郭芙蓉<br />莫小贝<br />刑捕头<br />祝无双<br />燕小六<br />姬无命<br /></td>
</tr>
</tbody></table>
<h3 id="爱情公寓"><a href="#爱情公寓" class="headerlink" title="爱情公寓"></a>爱情公寓</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405165020578.png" style="zoom: 50%;" /></td>
<td align="center">曾小贤<br />胡一菲<br />张伟<br />吕子乔<br />陈美嘉<br />陆展博<br />林宛瑜<br />唐悠悠<br />关顾神奇<br />秦羽墨<br /></td>
</tr>
</tbody></table>
<h3 id="龙门镖局"><a href="#龙门镖局" class="headerlink" title="龙门镖局"></a>龙门镖局</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405170824862.png" style="zoom: 50%;" /></td>
<td align="center">盛秋月<br />陆三金<br />温良恭<br />蔡八斗<br />吕青橙<br />糊糊<br />邱璎珞<br /></td>
</tr>
</tbody></table>
<h3 id="极品家丁"><a href="#极品家丁" class="headerlink" title="极品家丁"></a>极品家丁</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405171601882.png" style="zoom:50%;" /></td>
<td align="center">林晚荣<br />高酋<br />萧玉若<br />萧玉霜<br />福伯<br />四德<br />元大猛<br />程德<br />陶东成<br />陆中平<br /></td>
</tr>
</tbody></table>
<h3 id="废柴兄弟"><a href="#废柴兄弟" class="headerlink" title="废柴兄弟"></a>废柴兄弟</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405173102717.png" style="zoom:50%;" /></td>
<td align="center">许之一<br />张晓蛟<br />艾玛<br />兰菲<br />小白<br />多多<br /></td>
</tr>
</tbody></table>
<h3 id="麻辣隔壁"><a href="#麻辣隔壁" class="headerlink" title="麻辣隔壁"></a>麻辣隔壁</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220705174056424.png" style="zoom:80%;" /></td>
<td align="center">林大冲<br />吕胖胖<br />李凡达<br />柳小刀<br />四姑娘<br /></td>
</tr>
</tbody></table>
<h3 id="极品女士"><a href="#极品女士" class="headerlink" title="极品女士"></a>极品女士</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405174056424.png" style="zoom:50%;" /></td>
<td align="center">于莎莎(哈哈哈)</td>
</tr>
</tbody></table>
<h3 id="屌丝男士"><a href="#屌丝男士" class="headerlink" title="屌丝男士"></a>屌丝男士</h3><table>
<thead>
<tr>
<th align="center">封面</th>
<th align="center">主要角色</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/recall/image-20220405173815212.png" style="zoom:50%;" /></td>
<td align="center">大鹏(哈哈哈)</td>
</tr>
</tbody></table>
<hr>
<blockquote>
<p>主图拼接工具：<a href="https://www.photocollage.com/">Create online photo collages - PhotoCollage.com</a></p>
</blockquote>
]]></content>
<tags>
<tag>随笔</tag>
</tags>
</entry>
<entry>
<title>荷兰国旗-快速排序应用</title>
<url>/posts/5644be5d/</url>
<content><![CDATA[<hr>
<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/2019-04-20%20.png' height=120px >
<hr>
<span id="more"></span>
<h2 id="荷兰国旗"><a href="#荷兰国旗" class="headerlink" title="荷兰国旗"></a>荷兰国旗</h2><blockquote>
<p>”荷兰国旗难题“是计算机科学中的一个程序难题，它是由Edsger Dijkstra提出的。荷兰国旗是由红、白、蓝三色组成的。现有红白蓝三个不同颜色的小球，乱序排列在一起，请重新排列这些小球，使得红白蓝三色的同颜色的球在一起。<br>ps:我们可以将红白蓝三色小球想象成条状物，有序排列后正好组成荷兰国旗。</p>
</blockquote>
<h2 id="分析"><a href="#分析" class="headerlink" title="分析"></a>分析</h2><blockquote>
<p>arr[i]< key时相当于“荷兰国旗问题”中的0<br>arr[i]= key时相当于“荷兰国旗问题”中的1<br>arr[i]> key时相当于“荷兰国旗问题”中的2</p>
</blockquote>
<p>这样就可以使用“荷兰国旗问题”的解法来解决快速排序了，这样一来，即使待排序的元素中有一些元素和key一样，也能保证时间复杂度是最差是NlogN的，因为对于待排序的等于Key的数值，可以在执行下一次Partition时直接跳过，利于数据规模的降低。</p>
<hr>
<h2 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h2><figure class="highlight java"><figcaption><span>荷兰国旗</span></figcaption><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">NetherlandsFlag</span> {<br> <br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-type">int</span>[] partition(<span class="hljs-type">int</span>[] arr,<span class="hljs-type">int</span> L,<span class="hljs-type">int</span> R,<span class="hljs-type">int</span> p) {<br> <span class="hljs-type">int</span> <span class="hljs-variable">less</span> <span class="hljs-operator">=</span> L-<span class="hljs-number">1</span>;<br> <span class="hljs-type">int</span> <span class="hljs-variable">more</span> <span class="hljs-operator">=</span> R+<span class="hljs-number">1</span>;<br> <span class="hljs-keyword">while</span>(L < more) {<br> <span class="hljs-keyword">if</span>(arr[L] < p) {<br> swap(arr,++less,L++);<br> }<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span>(arr[L] > p) {<br> swap(arr,--more,L);<br> }<span class="hljs-keyword">else</span> {<br> L++;<br> }<br> <br> }<br> <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">int</span>[] {less+<span class="hljs-number">1</span>,more-<span class="hljs-number">1</span>};<br> <br> }<br> <br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">swap</span><span class="hljs-params">(<span class="hljs-type">int</span>[] arr, <span class="hljs-type">int</span> i, <span class="hljs-type">int</span> j)</span> {<br> <span class="hljs-type">int</span> <span class="hljs-variable">temp</span> <span class="hljs-operator">=</span> arr[i];<br> arr[i] = arr[j];<br> arr[j] = temp;<br> <br> }<br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-type">int</span>[] getArray() {<br> <span class="hljs-type">int</span> arr[] = <span class="hljs-keyword">new</span> <span class="hljs-title class_">int</span>[<span class="hljs-number">10</span>];<br> <span class="hljs-keyword">for</span>(<span class="hljs-type">int</span> <span class="hljs-variable">i</span> <span class="hljs-operator">=</span> <span class="hljs-number">0</span>;i < arr.length;i++) {<br> arr[i] = (<span class="hljs-type">int</span>)(Math.random()*<span class="hljs-number">3</span>);<br> }<br> <span class="hljs-keyword">return</span> arr;<br> }<br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">printArray</span><span class="hljs-params">(<span class="hljs-type">int</span> arr[])</span> {<br> <span class="hljs-keyword">if</span>(arr == <span class="hljs-literal">null</span>) {<br> <span class="hljs-keyword">return</span> ;<br> }<br> <span class="hljs-keyword">for</span>(<span class="hljs-type">int</span> <span class="hljs-variable">i</span> <span class="hljs-operator">=</span> <span class="hljs-number">0</span>;i < arr.length;i++) {<br> System.out.print(arr[i]+<span class="hljs-string">" "</span>);<br> }<br> System.out.println();<br> <br> }<br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">main</span><span class="hljs-params">(String args[])</span> {<br> <span class="hljs-type">int</span> test[] = getArray();<br> printArray(test); <br> <span class="hljs-type">int</span> res[] = partition(test,<span class="hljs-number">0</span>,test.length-<span class="hljs-number">1</span>,<span class="hljs-number">1</span>); <span class="hljs-comment">//p值为1，用来判断0，1，2 </span><br> printArray(test);<br> System.out.println(res[<span class="hljs-number">0</span>]);<br> System.out.println(res[<span class="hljs-number">1</span>]);<br> }<br><br>}<br></code></pre></td></tr></table></figure>
]]></content>
<tags>
<tag>算法</tag>
<tag>快速排序</tag>
</tags>
</entry>
<entry>
<title>记录腾讯云服务器当矿机的一天</title>
<url>/posts/23f6ec83/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/wx_title_2019-11-26-0.png' >
<span id="more"></span>
<h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><p>最近入手了一台腾讯云服务器玩玩，兴致勃勃的装上<code>Docker</code>，打算把之前的<code>SpringBoot</code>项目跑一跑。</p>
<p>安装<code>Docker</code>、配置<code>Maven Docker</code>插件、开放<code>Docker</code>远程端口(这里划重点要考)、配置服务器安全组端口、编写<code>Dockerfile</code>文件、打包上传镜像、运行项目,一切都很正常。</p>
<p>第二天早上，再次登录服务器时发现特别卡，下意识以为是自己运行项目的问题，初步排查一下，CPU占用100%，2M小水管带宽被占满……</p>
<h2 id="排查"><a href="#排查" class="headerlink" title="排查"></a>排查</h2><h3 id="TOP命令查看进程信息"><a href="#TOP命令查看进程信息" class="headerlink" title="TOP命令查看进程信息"></a><code>TOP</code>命令查看进程信息</h3><ul>
<li><p><code>TOP</code>命令查看进程信息，可以看到“sic”这个进程内存占用非常高，下面的“masscan”进程占用也相当高(百度发现可能是扫描端口的程序)</p>
<p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/2019-11-26-192508-3.png"></p>
</li>
</ul>
<h3 id="定位进程文件"><a href="#定位进程文件" class="headerlink" title="定位进程文件"></a>定位进程文件</h3><ul>
<li><p>根据<code>PID</code>执行命令,<code>ll /proc/7844</code>,发现执行路径在 /var/tmp/sic/sic ,同目录有一个<code>config.json</code>文件,其内容如下图,百度一下发现各个属性像极了挖矿程序的配置 - .-</p>
<p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/2019-11-26-192525-2.png"></p>
</li>
</ul>
<h3 id="查看定时任务"><a href="#查看定时任务" class="headerlink" title="查看定时任务"></a>查看定时任务</h3><ul>
<li>执行<code>crontab -l</code>命令,发现三个异常任务,以第一个为例，<code>corn表达式</code>0,30 * * * *表示每0分钟和每三十分钟执行一次任务,网址返回的为一段shell脚本代码,通过管道在本地执行脚本，任务三则是每0秒(每分钟)执行一段<code>Python</code>脚本，任务四是腾讯云的监控组件。</li>
<li>脚本内容大概就是通过<code>ssh</code>提权,删除系统日志,卸载安全组件,挖矿程序,代理服务等,然后定时执行，循环往复。</li>
</ul>
<p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/2019-11-26-192531-1.png"></p>
<h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p>百度一圈发现是因为<code>Docker</code>的远程服务没有任何加密措施，黑客可以远程直接运行任意容器,通过<code>-v</code> 命令(数据卷)将他的<code>ssh</code>公钥挂载到宿主机的<code>/root/.ssh</code>目录，从而实现提权。</p>
<p>傻乎乎当了一天矿机,出于安全考虑(系统已经惨不忍睹,也无法保证没有其他暗门),我立刻更换了公网IP,并且重置了系统镜像,然后我又安装上了<code>Docker</code>，不同的是这次我老老实实地在本地构建了镜像~</p>
]]></content>
<tags>
<tag>服务器</tag>
<tag>Docker</tag>
<tag>网络安全</tag>
</tags>
</entry>
<entry>
<title>最大间隔数-桶排序应用</title>
<url>/posts/28e83e0e/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/2019-05-23_wx_title.png' >
<span id="more"></span>
<h2 id="问题"><a href="#问题" class="headerlink" title="问题"></a>问题</h2><blockquote>
<p>给定一个未排序的数组，返回其排序后的数组中<strong>相邻元素之差</strong>的最大值<br>例：给定数组：[5,9,8,3,15]<br>   排序后：[3,5,8,9,15]<br>相邻元素之差最大的是15-9=6,结果即为6。<br>要求:时间空间复杂度均为O(n)。</p>
</blockquote>
<h2 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h2><figure class="highlight java"><table><tr><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">MaximumGap</span> {<br><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-type">int</span> <span class="hljs-title function_">maximumGap</span><span class="hljs-params">(<span class="hljs-type">int</span>[] arr)</span> {<br> <span class="hljs-keyword">if</span> (arr == <span class="hljs-literal">null</span> || arr.length < <span class="hljs-number">2</span>) {<br> <span class="hljs-keyword">return</span> <span class="hljs-number">0</span>;<br> }<br> <span class="hljs-type">int</span> <span class="hljs-variable">len</span> <span class="hljs-operator">=</span> arr.length;<br> <span class="hljs-type">int</span> <span class="hljs-variable">min</span> <span class="hljs-operator">=</span> Integer.MAX_VALUE;<br> <span class="hljs-type">int</span> <span class="hljs-variable">max</span> <span class="hljs-operator">=</span> Integer.MIN_VALUE;<br> <span class="hljs-keyword">for</span> (<span class="hljs-type">int</span> <span class="hljs-variable">i</span> <span class="hljs-operator">=</span> <span class="hljs-number">0</span>; i < len; i++) {<br> min = Math.min(min, arr[i]);<br> max = Math.max(max, arr[i]);<br> }<br> <span class="hljs-keyword">if</span> (min == max) {<br> <span class="hljs-keyword">return</span> <span class="hljs-number">0</span>;<br> }<br> <span class="hljs-type">boolean</span> book[] = <span class="hljs-keyword">new</span> <span class="hljs-title class_">boolean</span>[len + <span class="hljs-number">1</span>];<br> <span class="hljs-type">int</span> maxs[] = <span class="hljs-keyword">new</span> <span class="hljs-title class_">int</span>[len + <span class="hljs-number">1</span>];<br> <span class="hljs-type">int</span> mins[] = <span class="hljs-keyword">new</span> <span class="hljs-title class_">int</span>[len + <span class="hljs-number">1</span>];<br> <span class="hljs-type">int</span> <span class="hljs-variable">id</span> <span class="hljs-operator">=</span> <span class="hljs-number">0</span>;<br> <span class="hljs-keyword">for</span> (<span class="hljs-type">int</span> <span class="hljs-variable">i</span> <span class="hljs-operator">=</span> <span class="hljs-number">0</span>; i < len; i++) {<br> <span class="hljs-comment">// 划分桶号</span><br> id = (<span class="hljs-type">int</span>) ((arr[i] - min) * len / (max - min));<br> mins[id] = book[id] ? Math.min(mins[id], arr[i]) : arr[i];<br> maxs[id] = book[id] ? Math.max(maxs[id], arr[i]) : arr[i];<br> book[id] = <span class="hljs-literal">true</span>;<br> }<br> <span class="hljs-type">int</span> <span class="hljs-variable">res</span> <span class="hljs-operator">=</span> <span class="hljs-number">0</span>;<br> <span class="hljs-comment">// 第一个桶内默认是最小值</span><br> <span class="hljs-type">int</span> <span class="hljs-variable">lastMax</span> <span class="hljs-operator">=</span> maxs[<span class="hljs-number">0</span>];<br> <span class="hljs-type">int</span> <span class="hljs-variable">i</span> <span class="hljs-operator">=</span> <span class="hljs-number">1</span>;<br> <span class="hljs-keyword">for</span> (; i <= len; i++) {<br> <span class="hljs-keyword">if</span> (book[i]) {<br> <span class="hljs-comment">// 两个相邻的非空桶，后一个的最小值减去前一个的最大值为相对间隔最大值</span><br> res = Math.max(res, mins[i] - lastMax);<br> <span class="hljs-comment">// 当前桶的最大值更新为前一个最大值</span><br> lastMax = maxs[i];<br> }<br> }<br> <span class="hljs-keyword">return</span> res;<br><br> }<br><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-type">int</span> <span class="hljs-title function_">comparator</span><span class="hljs-params">(<span class="hljs-type">int</span>[] arr)</span> {<br> <span class="hljs-keyword">if</span> (arr == <span class="hljs-literal">null</span> || arr.length < <span class="hljs-number">2</span>) {<br> <span class="hljs-keyword">return</span> <span class="hljs-number">0</span>;<br> }<br> Arrays.sort(arr);<br> <span class="hljs-type">int</span> <span class="hljs-variable">gap</span> <span class="hljs-operator">=</span> Integer.MIN_VALUE;<br> <span class="hljs-keyword">for</span> (<span class="hljs-type">int</span> <span class="hljs-variable">i</span> <span class="hljs-operator">=</span> <span class="hljs-number">1</span>; i < arr.length; i++) {<br> gap = Math.max(arr[i] - arr[i - <span class="hljs-number">1</span>], gap);<br> }<br> <span class="hljs-keyword">return</span> gap;<br> }<br><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-type">int</span>[] getRandomArray(<span class="hljs-type">int</span> maxSize, <span class="hljs-type">int</span> maxValue) {<br> <span class="hljs-type">int</span>[] arr = <span class="hljs-keyword">new</span> <span class="hljs-title class_">int</span>[(<span class="hljs-type">int</span>) ((maxSize + <span class="hljs-number">1</span>) * Math.random())];<br> <span class="hljs-keyword">for</span> (<span class="hljs-type">int</span> <span class="hljs-variable">i</span> <span class="hljs-operator">=</span> <span class="hljs-number">0</span>; i < arr.length; i++) {<br> <span class="hljs-comment">// 获取 -maxVlaue + 1 ~ maxValue 的值</span><br> arr[i] = (<span class="hljs-type">int</span>) ((maxValue + <span class="hljs-number">1</span>) * Math.random()) - (<span class="hljs-type">int</span>) (maxValue * Math.random());<br> }<br><br> <span class="hljs-keyword">return</span> arr;<br><br> }<br><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-type">int</span>[] copyArray(<span class="hljs-type">int</span>[] arr) {<br> <span class="hljs-keyword">if</span> (arr == <span class="hljs-literal">null</span>) {<br> <span class="hljs-keyword">return</span> <span class="hljs-literal">null</span>;<br> }<br> <span class="hljs-type">int</span>[] book = <span class="hljs-keyword">new</span> <span class="hljs-title class_">int</span>[arr.length];<br> <span class="hljs-keyword">for</span> (<span class="hljs-type">int</span> <span class="hljs-variable">i</span> <span class="hljs-operator">=</span> <span class="hljs-number">0</span>; i < arr.length; i++) {<br> book[i] = arr[i];<br> }<br> <span class="hljs-keyword">return</span> book;<br> }<br><br> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">main</span><span class="hljs-params">(String[] args)</span> {<br> <span class="hljs-comment">// 测试次数</span><br> <span class="hljs-type">int</span> <span class="hljs-variable">test</span> <span class="hljs-operator">=</span> <span class="hljs-number">50000</span>;<br><br> <span class="hljs-comment">// 数组长度</span><br> <span class="hljs-type">int</span> <span class="hljs-variable">maxSize</span> <span class="hljs-operator">=</span> <span class="hljs-number">100</span>;<br><br> <span class="hljs-comment">// 最大数值</span><br> <span class="hljs-type">int</span> <span class="hljs-variable">maxValue</span> <span class="hljs-operator">=</span> <span class="hljs-number">100</span>;<br><br> <span class="hljs-type">boolean</span> <span class="hljs-variable">flag</span> <span class="hljs-operator">=</span> <span class="hljs-literal">true</span>;<br><br> <span class="hljs-keyword">for</span> (<span class="hljs-type">int</span> <span class="hljs-variable">i</span> <span class="hljs-operator">=</span> <span class="hljs-number">0</span>; i < test; i++) {<br> <span class="hljs-type">int</span> arr1[] = getRandomArray(maxSize, maxValue);<br> <span class="hljs-comment">// 拷贝比较</span><br> <span class="hljs-type">int</span> arr2[] = copyArray(arr1);<br> <span class="hljs-keyword">if</span> (maximumGap(arr1) != comparator(arr2)) {<br> flag = <span class="hljs-literal">false</span>;<br> <span class="hljs-keyword">break</span>;<br> }<br><br> }<br> System.out.println(flag ? <span class="hljs-string">"测试正常"</span> : <span class="hljs-string">"发生错误"</span>);<br> <span class="hljs-comment">// 随机测试一组数据</span><br> <span class="hljs-type">int</span> arr[] = getRandomArray(maxSize, maxValue);<br> <span class="hljs-type">int</span> <span class="hljs-variable">t</span> <span class="hljs-operator">=</span> maximumGap(arr);<br> System.out.println(<span class="hljs-string">"原数组:"</span>+Arrays.toString(arr));<br> Arrays.sort(arr);<br> System.out.println(<span class="hljs-string">"排序后:"</span>+Arrays.toString(arr));<br> System.out.println(<span class="hljs-string">"最大差值:"</span>+t);<br> }<br>}<br></code></pre></td></tr></table></figure>]]></content>
<tags>
<tag>桶排序</tag>
<tag>对数器</tag>
</tags>
</entry>
<entry>
<title>腾讯云轻量应用服务器入门指南</title>
<url>/posts/6e63f1a7/</url>
<content><![CDATA[<img src='https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/lighthouse1.png' >
<!-- more -->
<h1 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h1><p>轻量应用服务器（TencentCloud Lighthouse）是新一代开箱即用、面向轻量应用场景的云服务器产品，助力中小企业和开发者便捷高效的在云端构建网站、小程序/小游戏、电商、云盘/图床以及各类开发测试和学习环境。</p>
<blockquote>
<p>最近同学们都在准备毕业设计，正好借这次征文活动，水一水文章 - 。-</p>
</blockquote>
<h1 id="使用指南"><a href="#使用指南" class="headerlink" title="使用指南"></a>使用指南</h1><h2 id="地域"><a href="#地域" class="headerlink" title="地域"></a>地域</h2><ul>
<li>优先选择距离自己所在地相近区域，降低访问时延迟（类似CF游戏大区模式，hhh）</li>
<li>如果拥有多台服务器，尽量选择相同地域可以组建内网服务</li>
<li>非中国大陆地域不支持Linux与Windows之间系统转换</li>
</ul>
<h2 id="镜像"><a href="#镜像" class="headerlink" title="镜像"></a>镜像</h2><h3 id="系统镜像"><a href="#系统镜像" class="headerlink" title="系统镜像"></a>系统镜像</h3><ul>
<li>Linux Server：CentOS、Ubuntu、Debian、TencentOS……</li>
<li>Windows Server ：系统盘容量>50G，不支持二次虚拟化</li>
</ul>
<h3 id="应用镜像（这里主要列举用途）"><a href="#应用镜像（这里主要列举用途）" class="headerlink" title="应用镜像（这里主要列举用途）"></a>应用镜像（这里主要列举用途）</h3><ul>
<li>宝塔Linux面板：服务器运维面板，可以快速集成各类应用环境。小白首选（bushi<br><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/baota.png"></li>
<li>SRS流媒体服务器：个人服务器规格可能只适合于音视频相关知识学习，以及测试Demo</li>
<li>Typecho/WordPress/Discuz! Q：个人博客和内容管理网站</li>
<li>Theia IDE：云端IDE，便于临时开发，以及调研各类Demo（这里推荐下<a href="https://www.cloudstudio.net/">Cloud Studio - 开启云端开发模式 WebIDE</a>）</li>
</ul>
<p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/couldstudio.png"></p>
<ul>
<li>Docker镜像：开源的容器引擎，实现容器虚拟化。如选择基础镜像，则可以通过腾讯云控制台直接管理Docker容器</li>
</ul>
<p><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/docker.png"></p>
<ul>
<li>更多用途：个人网盘/图床/<strong>毕业设计</strong>……</li>
</ul>
<h2 id="防火墙"><a href="#防火墙" class="headerlink" title="防火墙"></a>防火墙</h2><ul>
<li>开放公有协议访问端口</li>
<li>开放自定义程序访问端口</li>
</ul>
<h2 id="快照"><a href="#快照" class="headerlink" title="快照"></a>快照</h2><ul>
<li>备份功能，在某个不可逆操作节点前进行快照备份</li>
<li>存储型套餐的实例不支持创建快照</li>
<li>免费快照配额为已创建实例数(待回收实例和存储型套餐实例除外)乘以2，且最多不超过10个</li>
</ul>
<h2 id="监控告警"><a href="#监控告警" class="headerlink" title="监控告警"></a>监控告警</h2><ul>
<li>实时监控服务器状态，最低时间粒度10s。（基于实例中默认安装的腾讯云监控组件，可卸载）</li>
<li>可配置告警规则，当服务器状态异常时（植入挖矿程序/程序卡死/硬盘爆满/内存溢出），触发告警通知</li>
</ul>
<h2 id="公网IP"><a href="#公网IP" class="headerlink" title="公网IP"></a>公网IP</h2><ul>
<li>最新策略：每台服务器生命周期内，只可更换一次公网IP（2022年3月）</li>
</ul>
<h2 id="域名解析"><a href="#域名解析" class="headerlink" title="域名解析"></a>域名解析</h2><ul>
<li>域名备案接入腾讯云</li>
<li>添加解析记录指向轻量应用服务器公网IP即可</li>
</ul>
<h1 id="体验-选购"><a href="#体验-选购" class="headerlink" title="体验&选购"></a>体验&选购</h1><p><a href="https://curl.qcloud.com/bUpvTDNp">【腾讯云轻量应用服务器】新用户首单特惠秒杀，2核2G云服务器（开箱即用）最低仅需45元/年</a><br><a href="https://curl.qcloud.com/bUpvTDNp"><br><img src="https://blog-resource-1251242863.cos.ap-shanghai.myqcloud.com/imags/cps2.png" style="zoom: 60%;" /><br></a></p>
]]></content>
<tags>
<tag>服务器</tag>
</tags>
</entry>
</search>