java中处理Json

参考资料：
http://www.cnblogs.com/lpshou/p/3821207.html

package webdemo;

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

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

public class JsonTest {
    public static void main(String[] args) {
        User user = new User();
        user.setUsername("lp");
        user.setPassword("1234");
        JSONArray json = JSONArray.fromObject(user);
        System.out.println(json);
        // 结果：[{"password":"1234","username":"lp"}]
        JSONObject json1 = JSONObject.fromObject(user);
        System.out.println(json1);
        //结果;{"password":"1234","username":"lp"}
        List<User> users = new ArrayList();
        User user1 = new User();
        user.setUsername("lp");
        user.setPassword("1234");
        User userSecond = new User();
        userSecond.setUsername("ch");
        userSecond.setPassword("4567");
        users.add(user);
        users.add(userSecond);
        JSONArray json2 = JSONArray.fromObject(users);
        System.out.println(json2);      
        // 结果：[{"password":"1234","username":"lp"},{"password":"4567","username":"ch"}]
        JSONObject json3=new JSONObject();
        json3.put("userss", users);
        json3.put("usersSecond", userSecond);
        System.out.println(json3);
        //结果：{"users":[{"password":"1234","username":"lp"},{"password":"4567","username":"ch"}],"userSecond":{"password":"4567","username":"ch"}}
        Map<String,Object> map=new HashMap<String,Object>();
        map.put("users",users);
        map.put("users",user);
        JSONArray json4=JSONArray.fromObject(map);
        System.out.println(json4);
        //结果：[{"users":[{"password":"1234","username":"lp"},{"password":"4567","username":"ch"}],"user":{"password":"1234","username":"lp"}}]
        Map<String, Object> map1 = new HashMap<String, Object>();
        map.put("users", users);
        map.put("user", user);
        JSONObject json5 = JSONObject.fromObject(map);
        System.out.println(json5);
        //结果：{"users":[{"password":"1234","username":"lp"},{"password":"4567","username":"ch"}],"user":{"password":"1234","username":"lp"}}
    }

}