java中JSON将数组对象转换成JSON字符串输出实例

先上代码和结果

 

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

import net.sf.json.JSONArray;

public class TestJsonObject {

    public static void main(String args[]){
        ArrayList   <User> users=new  ArrayList<User>();
        users.add(new User("zhangsan",21));
        users.add(new User("lisi",18));
        users.add(new User("wangwu",32));

        JSONArray result = JSONArray.fromObject(users);
        System.out.println(result);

    }

}

public class User {

    private String name;
    private int age;

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }
}

输出结果

 

[{"name":"zhangsan","value":21},{"name":"lisi","value":18},{"name":"wangwu","value":32}]

在这个例子中，json将users数组对象转化为json字符串输出了