使用JSONObject(json-lib)格式化bean，map，list！！！

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首先下载json-lib-2.2.2-jdk15.rar，里面的jar包全部放到项目中。

<span style="font-size:18px;">commons-beanutils-1.7.0.jar  commons-collections-3.2.jar  commons-lang-2.3.jar  commons-logging-1.1.jar  ezmorph-1.0.4.jar  json-lib-2.2.2-jdk15.jar </span>

1.格式化bean

package com.json.bean;public class User {private int id;private String name;private int age;private String sex;public User(int id, String name, int age, String sex) {this.id = id;this.name = name;this.age = age;this.sex = sex;}                  //get set方法省略}

public static void main(String[] args) {User user = new User(100, "周星星", 23, "男");JSONObject jsonObject = JSONObject.fromObject(user);String json = jsonObject.toString();System.out.println(json);}

2.格式化 Map

public static void main(String[] args) {Map<String, String> map = new HashMap<String, String>();map.put("name", "张三");map.put("age", "26");map.put("sex", "男");JSONObject jsonObject = JSONObject.fromObject(map);String json = jsonObject.toString();System.out.println(json);}

3.格式化 List

public static void main(String[] args) {User u1 = new User(1, "张三", 23, "男");User u2 = new User(2, "李四", 24, "妖");User u3 = new User(3, "王五", 25, "女");List<User> list = new ArrayList<User>();list.add(u1);list.add(u2);list.add(u3);JSONArray jsonArray = JSONArray.fromObject(list);String json = jsonArray.toString();System.out.println(json);}

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