闲话少说，通过实例简单介绍一下org.json的用法，用到的jar包是json-20090211.jar

<pre name="code" class="java">package com.ilucky.util.orgjson;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

/**
 * 重点:JSONObject对应集合Map,JSONArray对应集合List.
 * 用json类(fastjson和orgjson)库处理复杂的集合时,要将集合直接放到value处,不能将其转换为json字符串放到value处,* 如果将其转换为字符串放到value处,最终生成的json字符串会带有转义字符.
 * @author IluckySi
 * @since 20150407
 */
public class OrgjsonUtil {

	public static void main(String[] args) {
		try {
			//JSONObject的用法.
			System.out.println("-----test1-----");
			testJsonObject();
			
			//JSONArray的用法.
			System.out.println("-----test2-----");
			testJsonArray();
			
			//JSONObject,JSONArray和集合的复杂用法.
			System.out.println("-----test3-----");
			testComplex();
			
			//JSONObject,JSONArray和集合的复杂用法.
			System.out.println("-----test4-----");
			testComplex2();
		} catch (Exception e) {
			System.out.println("测试发生异常: " + e);
		}
	}
	
	public static void testJsonObject() throws JSONException {
		JSONObject jo = new JSONObject();
		jo.put("username","IluckySi");
		jo.put("age",27);
		jo.put("sex",true);
		Map<String,String> skill = new HashMap<String,String>();
		skill.put("java","不错");
		skill.put("javascript","凑合");
		skill.put("jquery","挺好");
		jo.put("skill",skill);
		String username = jo.getString("username");
		int age = jo.getInt("age");
		boolean sex = jo.getBoolean("sex");
		JSONObject skill2 = new JSONObject(jo.getString("skill"));
		System.out.println(username + ",年龄 = " + age + ",性别 = " + (sex == true ? "男" : "女") + ",技能如下:");
		String[] names = JSONObject.getNames(skill2);
		for(String name : names) {
			System.out.println(name + ": " + skill2.getString(name));
		}
	}
	
	public static void testJsonArray() throws JSONException {
		JSONArray ja = new JSONArray();
		JSONObject jo = new JSONObject();
		jo.put("username",true);
		ja.put(jo);
		JSONObject jo2 = new JSONObject();
		jo2.put("username","IluckySi2");
		jo2.put("age",28);
		jo2.put("sex",false);
		ja.put(jo2);
		for(int i = 0; i < ja.length(); i++) {
			JSONObject j = (JSONObject)ja.get(i);
			String username = j.getString("username");
			int age = j.getInt("age");
			boolean sex = j.getBoolean("sex");
			System.out.println(username + ",性别 = " + (sex == true ? "男" : "女"));
		}
		
	}
	
	public static void testComplex() throws JSONException {
		JSONObject jo = new JSONObject();
		jo.put("result","success");
		List<Map<Object,Object>> list = new ArrayList<Map<Object,Object>>();
		Map<Object,Object> user1 = new HashMap<Object,Object>();
		user1.put("name","name1");
		user1.put("password","password1");
		list.add(user1);
		Map<Object,Object> user2 = new HashMap<Object,Object>();
		user2.put("name","name2");
		user2.put("password","password2");
		list.add(user2);
		jo.put("message",list);
		String send = jo.toString();
		System.out.println("要测试的消息" + send);
		send(send);
	}
	
	private static void send(String send) throws JSONException {
		JSONObject jo = new JSONObject(send);
		String result = jo.getString("result");
		System.out.println("result=" + result);
		JSONArray ja = new JSONArray(jo.getString("message"));
		for(int i = 0; i < ja.length(); i++) {
			JSONObject j = (JSONObject)ja.get(i);
			String name = j.getString("name");
			String password = j.getString("password");
			System.out.println("name = " + name + ",password = " + password);
		}
	}
	
	public static void testComplex2() throws JSONException {	
		JSONObject jo = new JSONObject();
		jo.put("result","success");
		JSONObject message = new JSONObject();
		List<Map<Object,"password2");
		list.add(user2);
		message.put("message",list);
		jo.put("message",message.toString());//注意:如果直接写message,也不会有转义字符.
		String send = jo.toString();
		System.out.println("要测试的消息" + send);
		send2(send);
	}
	
	private static void send2(String send) throws JSONException {
		JSONObject jo = new JSONObject(send);
		String result = jo.getString("result");
		System.out.println("result=" + result);
		JSONObject message = new JSONObject(jo.getString("message"));
		JSONArray message2 = new JSONArray(message.getString("message"));
		for(int i = 0; i < message2.length(); i++) {
			JSONObject j = (JSONObject)message2.get(i);
			String name = j.getString("name");
			String password = j.getString("password");
			System.out.println("name = " + name + ",password = " + password);
		}
	}
}

/**
输出结果:
-----test1-----
IluckySi,年龄 = 27,性别 = 男,技能如下:
javascript: 凑合
java: 不错
jquery: 挺好
-----test2-----
IluckySi,性别 = 男
IluckySi2,年龄 = 28,性别 = 女
-----test3-----
要测试的消息{"message":[{"name":"name1","password":"password1"},{"name":"name2","password":"password2"}],"result":"success"}
result=success
name = name1,password = password1
name = name2,password = password2
-----test4-----
要测试的消息{"message":"{\"message\":[{\"name\":\"name1\",\"password\":\"password1\"},{\"name\":\"name2\",\"password\":\"password2\"}]}",password = password2

*/