为什么80%的码农都做不了架构师？>>> 
package com.adam;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class StringTemplateParser {
private String pstartTag = "${";
private String pendTag = "}";
/**
*
* @param template 要解析的字符串
* @param map 对应的值
* @return 返回解析结果
*/
public String parse(String template,Map<String,String> map){
StringBuffer temp = new StringBuffer(template);
Map<String,String> tagMap = this.getTagIndex(template);
for(Map.Entry<String, String> entry:tagMap.entrySet()){
//获得标识符
String tag = entry.getValue();
//获得替换的值，如果没有，则不变
String repVal = map.get(entry.getKey())==null?entry.getValue():map.get(entry.getKey());
//获得标识符在字符串中出现的次数
int index = 0;
//判断同一个标识符在字符串中出现的次数
while((index=template.indexOf(tag,index))!=-1){
//替换
//System.out.println(tag+"位置:"+index);
temp = temp.replace(temp.indexOf(tag), temp.indexOf(tag)+tag.length(), repVal);
index += tag.length();
}
}
return temp.toString();
}
/**
* 获得key和对应的标识符如{age=${age}, name=${name}}
* @param template
* @return
*/
protected Map<String,String> getTagIndex(String template){
Map<String,String> map = new HashMap<String,String>();
Pattern pattern = Pattern.compile("\\$\\{[\\w]+\\}") ;
Matcher matcher = pattern.matcher(template);
int pstartLen = pstartTag.length();
while(matcher.find()){
//获得标示符
String tag = matcher.group();
//获得key
String key = tag.substring(pstartLen, tag.lastIndexOf(pendTag));
map.put(key, tag);
}
return map;
}
public static void main(String[] args) {
String template = "${age} hi,${name},${name} are you ${age}?";
Map<String, String> map = new HashMap<String, String>();
map.put("name", "adam");
map.put("age", "25");
StringTemplateParser stp = new StringTemplateParser();
System.out.println(stp.parse(template,map));
System.out.println(stp.getTagIndex(template));
}
}