json包中JSONArray、JSONObject等类的使用

最新推荐文章于 2019-04-12 15:23:13 发布

gaishi_hero

最新推荐文章于 2019-04-12 15:23:13 发布

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本文介绍如何使用Java的net.sf.json库进行JSON数据的转换，包括集合到数组、对象到JSON对象及配置排除字段的方法。

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package testJson;

import domain.User;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
import org.junit.Test;

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

public class TestJson {
    @Test//使用JSONArray将集合类型对象转为数组
    public void test1(){
        ArrayList<String> list = new ArrayList<>();
        list.add("zhangsan");
        list.add("lisi");
        list.add("wangwu");
        System.out.println(JSONArray.fromObject(list).toString());
    }
    @Test//使用JSONObject将对象中的成员变量转为json对象
    public void test2(){
        User u = new User();
        u.setName("zhang");
        u.setPassword("haha");
        u.setId(1);
        System.out.println(JSONObject.fromObject(u).toString());
    }
    @Test//使用JSONArray将集合类型对象转为数组，数组中的元素是一个个json对象
    public void test3(){
        List<User> list = new ArrayList<>();
        User u1 = new User();
        u1.setName("zhang");
        u1.setPassword("haha");
        User u2 = new User();
        u2.setName("zhao");
        u2.setPassword("hehe");
        User u3 = new User();
        u3.setName("li");
        u3.setPassword("heng");
        list.add(u1);
        list.add(u2);
        list.add(u3);
        System.out.println(JSONArray.fromObject(list).toString());
    }
    @Test//使用JsonConfig来配置哪些成员变量不需要被写进json对象中
    public void test4(){
        List<User> list = new ArrayList<>();
        User u1 = new User();
        u1.setName("zhang");
        u1.setPassword("haha");
        User u2 = new User();
        u2.setName("zhao");
        u2.setPassword("hehe");
        User u3 = new User();
        u3.setName("li");
        u3.setPassword("heng");
        list.add(u1);
        list.add(u2);
        list.add(u3);
        JsonConfig jc = new JsonConfig();
        jc.setExcludes(new String[]{"birthday","email"});
        System.out.println(JSONArray.fromObject(list,jc).toString());
    }
}

输出结果依次是：

["zhangsan","lisi","wangwu"]
{"birthday":null,"email":"","id":1,"name":"zhang","password":"haha"}
[{"birthday":null,"email":"","id":0,"name":"zhang","password":"haha"},{"birthday":null,"email":"","id":0,"name":"zhao","password":"hehe"},{"birthday":null,"email":"","id":0,"name":"li","password":"heng"}]
[{"id":0,"name":"zhang","password":"haha"},{"id":0,"name":"zhao","password":"hehe"},{"id":0,"name":"li","password":"heng"}]