java 正则提取及替换字符串

<%@ page import="java.util.regex.Pattern" %>
<%@ page import="java.util.regex.Matcher" %>
<%@ page import="java.util.List" %>
<%@ page import="java.util.ArrayList" %>

<%@ page import="java.util.HashMap" %>
<%@ page import="java.util.Map" %>
    <%@ page import="org.apache.commons.lang.StringUtils" %><%--
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--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%

//String callbackurl="http://gad.netease.com/mmad/click?s=o%2FYhx2YEuzG0A4tdBTuxfvAWBzo%3D&project_id=11612469&monitor_type=4&idfa={idfa}&imei={idfa}";
//
//    String s = "dsadsadas({idfa})<peter>dsadasdas<lionel>\"www.163.com\"<kenny>{idfa}<>";
//    Pattern p = Pattern.compile("(\\{[^>]*})");
//    Matcher m = p.matcher(s);
//    List<String> result=new ArrayList<String>();
//    while(m.find()){
//        result.add(m.group());
//    }
//    for(String s1:result){
//        System.out.println(s1);
//    }


    Map<String,String> tokens = new HashMap<String,String>();
    tokens.put("cat", "Garfield");
    tokens.put("beverage", "coffee");
    tokens.put("jim", "ccf");

    //匹配类似velocity规则的字符串
    String template = "{cat} really needs {jim} some {beverage}.";
    //生成匹配模式的正则表达式
    String patternString = "\\{(" + StringUtils.join(tokens.keySet(), "|") + ")\\}";

    Pattern pattern = Pattern.compile(patternString);
    Matcher matcher = pattern.matcher(template);

    //两个方法：appendReplacement, appendTail
    StringBuffer sb = new StringBuffer();
    while(matcher.find()) {
        matcher.appendReplacement(sb, tokens.get(matcher.group(1)));
    }
    matcher.appendTail(sb);

    //out: Garfield really needs some coffee.
    System.out.println(sb.toString());



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