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

首先下載json-lib-2.2.2-jdk15.rar，裏面的jar包全部放到項目中。

<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", "張三");
		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, "張三", 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);
	}