#4 提交实验代码

jweb/src/edu/hzu/javaweb/labs/se1414080902119/se1414080902119servlet.java

@@ -0,0 +1,159 @@
+package edu.hzu.javaweb.labs.se1414080902119;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+@WebServlet("/1414080902119")
+public class se1414080902119servlet extends HttpServlet {
+	private static final long serialVersionUID = 1L;
+
+	//初始化基本数据
+	private static List<BookType> types;
+	static{
+		types=new ArrayList<>();
+		types.add(new BookType("数学", false));
+		types.add(new BookType("文学",false));
+		types.add(new BookType("天文学",true));
+	}
+
+	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+		doPost(request, response);
+	}
+
+	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+		response.setContentType("application/json;charset=utf-8");
+		request.setCharacterEncoding("utf-8");
+		String operate=request.getParameter("operate");
+		if(operate==null)operate="";
+		switch (operate) {
+		case "add":
+			addTypes(response,request);
+			break;
+		case "delete":
+			deleteTypes(response,request);
+			break;
+		default: showList(response);
+			break;
+		}
+
+	}
+
+	private void deleteTypes(HttpServletResponse response, HttpServletRequest request) throws IOException {
+		// TODO Auto-generated method stub
+		String name=request.getParameter("name");
+		String str="";
+		System.out.println(name);
+		String[]arr=name.split(",");
+		for(int j=0;j<arr.length;j++)
+		{
+			for(int i=0;i<types.size();i++){
+				BookType type=types.get(i);
+				String typeName=type.getName();
+				if(typeName.equals(arr[j]))
+				{
+					if(type.getIsHasBook()==false)
+					types.remove(type);
+					else str+=type.getName()+",";
+					break;
+				}
+			} 
+		}
+		if(str.length()>1){
+			str=str.substring(0, str.length()-1);
+		}
+		PrintWriter writer = response.getWriter();
+		if(str.length()==0){
+			writer.write("{\"msg\":\"success\"}");
+		}
+		else writer.write("{\"msg\":\""+str+" 类别下有图书，不可删除"+"\"}");
+
+		writer.close();
+	}
+
+	public void showList(HttpServletResponse response) throws IOException
+	{
+		PrintWriter writer = response.getWriter();
+		writer.write(reJSON(types));
+		writer.close();
+	}
+
+	public void addTypes(HttpServletResponse response,HttpServletRequest request)throws IOException
+	{
+		String name=request.getParameter("name");
+		PrintWriter writer = response.getWriter();
+		if(name==null||name.equals(""))
+		{
+		writer.write("{\"msg\":\"请输入图书类别\"}");
+		writer.close();
+		return ;
+		}
+		for(int i=0;i<types.size();i++){
+			if(types.get(i).getName().equals(name))
+			{
+				writer.write("{\"msg\":\"该图书类别存在\"}");
+				writer.close();
+				return ;
+			}
+		}
+		BookType type=new BookType();
+		type.setName(name);
+		type.setIsHasBook(false);
+		types.add(type);
+		writer.write("{\"msg\":\"success\"}");
+		writer.close();
+	}
+
+	/**
+	 * 返回JSON数据
+	 * @param list   图书类别集合
+	 * @return 图书类别的JSON数据
+	 */
+	public String reJSON(List<BookType> list)
+	{
+		StringBuffer str=new StringBuffer("{");
+		Iterator<BookType> iterator = list.iterator();
+		while(iterator.hasNext())
+		{
+			BookType bookType = iterator.next();
+			str.append("\""+bookType.getName()+"\":\""+bookType.getIsHasBook()+"\"");
+			if(iterator.hasNext())str.append(",");
+		}
+		str.append("}");
+		return str.toString();
+	}
+}
+//图书类别类
+class BookType
+{
+	private String name;  						//图书类别名字
+	private Boolean isHasBook;				//该类别下是否有图书标志
+	public String getName() {
+		return name;
+	}
+	public void setName(String name) {
+		this.name = name;
+	}
+	public Boolean getIsHasBook() {
+		return isHasBook;
+	}
+	public void setIsHasBook(Boolean isHasBook) {
+		this.isHasBook = isHasBook;
+	}
+	public BookType(String name, Boolean isHasBook) {
+		super();
+		this.name = name;
+		this.isHasBook = isHasBook;
+	}
+	public BookType() {
+		super();
+	}
+}

jweb/web/1414080902119/client.jsp

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+<%@ page language="java" contentType="text/html; charset=utf-8"
+	pageEncoding="utf-8"%>
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<head>
+<title>Insert title here</title>
+<link rel="stylesheet"
+	href="http://cdn.bootcss.com/bootstrap/3.3.0/css/bootstrap.min.css">
+<link rel="stylesheet"
+	href="http://cdn.bootcss.com/bootstrap/3.3.0/css/bootstrap-theme.min.css">
+<script src="http://cdn.bootcss.com/jquery/1.11.1/jquery.min.js"></script>
+<script src="http://cdn.bootcss.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
+</head>
+<script type="text/javascript">
+	var str = null;
+	var url="../1414080902119";
+	var aBtn = document.getElementsByClassName('btn1 btn btn-default button');
+	var aDiv=document.getElementsByClassName("hehe");
+	window.onload = function() {
+		aBtn[0].onclick=function()
+		{
+			ajax(url,addElement);
+		}
+	}
+
+	/* 
+	* 将json数据转化为标签
+	*/
+	function addElement(json)
+	{
+		var oDiv=document.getElementById("top");
+		oDiv.innerText="";
+		for(var a in json)
+		{
+			var oA=document.createElement("a");
+			oA.className="list-group-item";
+			oA.innerText=a;
+			oDiv.appendChild(oA);
+		}
+	}
+	/*
+	* url请求地址
+	* doSome方法对json数据进行处理
+	* ajax获取数据
+	*/
+	function ajax(url,doSome,data) {
+		var xmlHttpRequest = null;
+		try {
+			xmlHttpRequest = new XMLHttpRequest();
+		} catch (e) {
+			xmlHttpRequest = new ActiveXObject('Microsoft.XMLHTTP');
+		}
+		xmlHttpRequest.open('post', url+'?' + new Date().getTime(),
+				true)
+		xmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded");  
+		xmlHttpRequest.send(data);
+		xmlHttpRequest.onreadystatechange = function() {
+			if (xmlHttpRequest.readyState == 4) {
+				if (xmlHttpRequest.status == 200) {
+					str = xmlHttpRequest.responseText;
+					var json=eval('('+str+')')
+					doSome(json);
+				} else {
+					alert("出错了");
+				}
+			}
+		}
+	}
+</script>
+<body>
+	<div style="width: 380px; margin: 0 auto; margin-top: 50px;" id="main"
+		align="center">
+		<div class="btn-group btn-group-justified">
+			<div class="btn-group">
+				<button id="btn1" type="button" class="btn1 btn btn-default button">查看图书类别</button>
+			</div>
+		</div>
+		<div class="hehe"
+			style="width: 380px; height: 200px; border: 1px solid #000; border-radius: 5px">
+			<div class="list-group" id="top">
+			</div>
+		</div>
+	</div>
+</body>
+</html>