json官方包和阿里巴巴fastjson包的用法比较

package com.test;

import java.util.ArrayList; 
import java.util.List;

import org.json.JSONException;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

public class TestJson {

    //测试json解析
    public static void main(String[] args) {
        
        //1.从对象或集合到JSON字符串
        
        //对象
        User u1=new User(999,"admin","123"); 
        
        ////使用fistJSON测试
        String ju1= JSONObject.toJSONString(u1);
        
        System.out.println("ju1="+ju1);
        
        

        //集合
        List<User> lu=new ArrayList<User>();
        lu.add(new User(111,"tom","2121"));
        lu.add(new User(2,"tom1","2121"));
        lu.add(new User(3,"tom2","2121"));
        lu.add(new User(4,"tom3","2121"));
        lu.add(new User(5,"tom4","2121"));
        
        String jlu=JSONArray.toJSONString(lu);
        System.out.println("jlu="+jlu);
        

        //2.从JSON字符串到对象或集合
            
        ////使用fistJSON
        User u2= JSONObject.parseObject(ju1, User.class);
        System.out.println("u2="+u2);
                
        List<User> lu2=JSONArray.parseArray(jlu, User.class);
        
        for(User u:lu2)
        {
            System.out.println("lu2="+u);
        }
        
        
        ////使用官方JSON测试,只能JSON到对象或集合    
            try {
                org.json.JSONObject jo=new org.json.JSONObject(ju1);
                int userid=jo.getInt("userid");
                System.out.println("userid="+userid);
                
            } catch (JSONException e) {
                
                e.printStackTrace();
            }
                        
    }

}