package JSON;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class JSONObjectSample {

 //创建JSONObject对象   
    private static JSONObject createJSONObject(){   
    	
        JSONObject jsonObject = new JSONObject();   
        jsonObject.put("username","huangwuyi");   
        jsonObject.put("sex","男");   
        jsonObject.put("QQ","999999999");   
        jsonObject.put("Min.score",new Integer(99));   
        jsonObject.put("nickname","梦中心境");   
        return jsonObject;   
    }   
    public static void main(String[] args) {   
        JSONObject jsonObject = JSONObjectSample.createJSONObject();   
        //输出jsonobject对象   
        System.out.println("jsonObject==>"+jsonObject);   
           
        //判读输出对象的类型   
        boolean isArray = jsonObject.isArray();   
        boolean isEmpty = jsonObject.isEmpty();   
        boolean isNullObject = jsonObject.isNullObject();   
        System.out.println("isArray:"+isArray+" isEmpty:"+isEmpty+" isNullObject:"+isNullObject);  
           
        //添加属性   
        jsonObject.element("address","福建省厦门市");   
        System.out.println("添加属性后的对象==>"+jsonObject);   
           
        //返回一个JSONArray对象   
        JSONArray jsonArray = new JSONArray();   
        jsonArray.add(0,"this is a jsonArray value");   
        jsonArray.add(1,"another jsonArray value");   
        jsonObject.element("jsonArray",jsonArray);   
        JSONArray array = jsonObject.getJSONArray("jsonArray");   
        System.out.println("返回一个JSONArray对象："+array);   
        //添加JSONArray后的值   
//        {"username":"huangwuyi","sex":"男","QQ":"999999999","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市","jsonArray":["this is a jsonArray value","another jsonArray value"]} 
        System.out.println("结果="+jsonObject);   
           
        //根据key返回一个字符串   
        String username = jsonObject.getString("username");   
        System.out.println("username==>"+username);  
        
        //把字符转换为 JSONObject
        String temp=jsonObject.toString();
        
        JSONObject object = JSONObject.fromObject(temp);
        //转换后根据Key返回值
        System.out.println("qq="+object.get("QQ"));
        
    }  

}

=======================================================================================================

结果：

jsonObject==>{"username":"huangwuyi","nickname":"梦中心境"}
isArray:false isEmpty:false isNullObject:false
添加属性后的对象==>{"username":"huangwuyi","address":"福建省厦门市"}
返回一个JSONArray对象：["this is a jsonArray value","another jsonArray value"]
结果={"username":"huangwuyi","another jsonArray value"]}
username==>huangwuyi
qq=999999999