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PlaceholderUtil.java
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PlaceholderUtil.java
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package me.ctf.lab.util;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* 占位符工具
*
* @author: chentiefeng[chentiefeng@linzikg.com]
* @create: 2019-12-26 11:47
*/
public class PlaceholderUtil {
private static final Pattern PATTERN = Pattern.compile("\\$\\{[^}]+}");
/**
* 解析占位符变量<br/>
* <br/>
* 占位符格式<code>${abc}</code><br/>
* <i>例子1:<code>s = hello ${abc},analyze(s,{abc=world}) = hello world</code></i><br/>
* <i>例子2:<code>s = hello ${abc},analyze(s,{ab=world}) = hello ${abc}</code></i><br/>
* <br/>
* <strong>日期占位符格式:${yyyyMMdd,addAmount,unit}</strong><br/>
* <i>例子1:<code>s = hello ${yyyyMMdd},analyze(s,null) = hello 20191226</code></i><br/>
* <i>例子2:<code>s = hello ${yyyyMMdd,-1},analyze(s,null) = hello 20191225</code></i><br/>
* <i>例子3:<code>s = hello ${yyyyMMdd,-1,Months},analyze(s,null) = hello 20191126</code></i><br/>
* <pre>日期格式和单位请参考java.time.format.DateTimeFormatter和java.time.temporal.ChronoUnit</pre>
*
* @param varString
* @param varMap
* @return 解析后的字符串
* @see DateTimeFormatter
* @see ChronoUnit
*/
public static String analyze(String varString, Map<String, Object> varMap) {
return analyze(varString, varMap, LocalDateTime.now(), null);
}
/**
* 解析参数变量
*
* @param varString
* @param varMap
* @param now
* @param fixedStr
* @return
*/
private static String analyze(String varString, Map<String, Object> varMap, LocalDateTime now, String fixedStr) {
if (varString == null || varString.trim().length() == 0) {
return varString;
}
StringBuffer sb = new StringBuffer();
Matcher matcher = PATTERN.matcher(varString);
String group, var;
while (matcher.find() && (group = matcher.group()) != null) {
var = group.substring(2, group.length() - 1);
Object value;
if ((value = fixedStr) != null || (value = getVarValue(var, varMap, now)) != null) {
matcher.appendReplacement(sb, value.toString());
}
}
matcher.appendTail(sb);
return sb.toString();
}
/**
* 获取变量值
*
* @param var
* @param varMap
* @param now
* @return
*/
private static Object getVarValue(String var, Map<String, Object> varMap, LocalDateTime now) {
Object value;
if (varMap != null && (value = varMap.get(var)) != null) {
//普通变量
return value;
}
if (var != null && now != null) {
String[] arr = var.split(",");
LocalDateTime next;
DateTimeFormatter dtf;
try {
dtf = DateTimeFormatter.ofPattern(arr[0]);
} catch (IllegalArgumentException e) {
return null;
}
switch (arr.length) {
case 2:
//时间变量有加减,默认加减天,${yyyyMMdd,2}
next = getNextDate(now, arr[1].trim(), ChronoUnit.DAYS);
break;
case 3:
//时间变量有加减,默认加减天,${yyyyMMdd,2,Months}
next = getNextDate(now, arr[1].trim(), ChronoUnit.valueOf(arr[2].trim().toUpperCase()));
break;
default:
//时间变量,无加减,${yyyyMMdd}
next = now;
break;
}
return dtf.format(next);
}
return null;
}
/**
* 获取时间
*
* @param now
* @param express
* @param unit
* @return
*/
private static LocalDateTime getNextDate(LocalDateTime now, String express, ChronoUnit unit) {
int amount = express.startsWith("+") ? Integer.parseInt(express.substring(1)) : Integer.parseInt(express);
return now.plus(amount, unit);
}
/**
* 用特定字符串解析,除了日期占位符
*
* @param varString
* @param fixedStr
* @return
*/
public static String analyzeToFixedStr(String varString, String fixedStr) {
return analyze(varString, null, LocalDateTime.now(), fixedStr);
}
public static void main(String[] args) {
String s = "My log file path is /home/admin/${abc}-placeholder-${def}.log";
Map<String, Object> param = new HashMap<>(8);
param.put("abc", "lab");
param.put("def", "util");
System.out.println("==========场景1==========");
System.out.println("模板:" + s);
System.out.println("参数:" + param);
System.out.println("结果:" + analyze(s, param));
System.out.println("==========场景2==========");
s = "My log file path is /home/admin/${abc}-placeholder-${def}.log";
param.clear();
param.put("abc", "lab");
System.out.println("模板:" + s);
System.out.println("参数:" + param);
System.out.println("结果:" + analyze(s, param));
System.out.println("==========场景3==========");
s = "My log file path is /home/admin/${abc}-placeholder-${def}-${yyyyMMdd}.log";
param.clear();
param.put("abc", "lab");
param.put("def", "util");
System.out.println("模板:" + s);
System.out.println("参数:" + param);
System.out.println("结果:" + analyze(s, param));
System.out.println("==========场景4==========");
s = "My log file path is /home/admin/${abc}-placeholder-${def}-${yyyyMMdd,-1}.log";
param.clear();
param.put("abc", "lab");
param.put("def", "util");
System.out.println("模板:" + s);
System.out.println("参数:" + param);
System.out.println("结果:" + analyze(s, param));
System.out.println("==========场景5==========");
s = "My log file path is /home/admin/${abc}-placeholder-${def}-${yyyyMMdd,-1,Years}.log";
param.clear();
param.put("abc", "lab");
param.put("def", "util");
System.out.println("模板:" + s);
System.out.println("参数:" + param);
System.out.println("结果:" + analyze(s, param));
}
}