json于java之间的转化

最新推荐文章于 2025-07-05 12:34:26 发布

原创最新推荐文章于 2025-07-05 12:34:26 发布 · 250 阅读

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本文介绍如何将JavaBean对象转换为JSON格式，并演示了如何使用JSONArray和JSONObject进行转换。同时，文章还展示了如何将JavaBean列表和Map集合转换为JSON格式。

TestUser:

private String userName;
private String password;
private String old;
private String sex;
private String phone;

//1.普通的javabean转化为json格式
      TestUser testUser = new TestUser();
      testUser.setUserName("wangbingbing");
      testUser.setPassword("123456");
      testUser.setOld("18");
      testUser.setPhone("15748574147");
      testUser.setSex("女");
      //转为JSONArray类型
      JSONArray json = JSONArray.fromObject(testUser);
      System.out.println(json);//[{"old":"18","password":"123456","phone":"15748574147","sex":"女","userName":"wangbingbing"}]
      //转为JSONObject
      JSONObject jsonObj = JSONObject.fromObject(testUser);
      System.out.println(jsonObj);//{"old":"18","password":"123456","phone":"15748574147","sex":"女","userName":"wangbingbing"}
      //JSONObject转化为javabean
      TestUser o = (TestUser) JSONObject.toBean(jsonObj, TestUser.class);
      System.out.println(o.getUserName());//wangbingbing
      //2.list转为json格式
      List<TestUser> users = new ArrayList<TestUser>();
      TestUser testUser1 = new TestUser();
      testUser1.setUserName("wangfeng");
      testUser1.setPassword("789456");
      testUser1.setOld("68");
      testUser1.setPhone("15784571147");
      testUser1.setSex("男");
      users.add(testUser1);
      users.add(testUser);
      //list转为JSONArray
      JSONArray json1 = JSONArray.fromObject(users);
      System.out.println(json1.toString());//[{"old":"68","password":"789456","phone":"15784571147","sex":"男","userName":"wangfeng"},{"old":"18","password":"123456","phone":"15748574147","sex":"女","userName":"wangbingbing"}]

      //list转为JSONObject
      JSONObject jsonObj1 = new JSONObject();
      jsonObj1.put("testUser", testUser);
      jsonObj1.put("testUser1", testUser1);
      System.out.println(jsonObj1);//{"testUser":{"old":"18","password":"123456","phone":"15748574147","sex":"女","userName":"wangbingbing"},"testUser1":{"old":"68","password":"789456","phone":"15784571147","sex":"男","userName":"wangfeng"}}

      //map转为JSONArray
      Map<String,Object> map = new HashMap<String,Object>();
      map.put("testUser", testUser);
      map.put("testUser1", testUser1);
      JSONArray json2 = JSONArray.fromObject(map);
      System.out.println(json2.toString());//[{"testUser1":{"old":"68","password":"789456","phone":"15784571147","sex":"男","userName":"wangfeng"},"testUser":{"old":"18","password":"123456","phone":"15748574147","sex":"女","userName":"wangbingbing"}}]
      //map转为JSONObject
      JSONObject json3 = JSONObject.fromObject(map);
      System.out.println(json3);// {"testUser1":{"old":"68","password":"789456","phone":"15784571147","sex":"男","userName":"wangfeng"},"testUser":{"old":"18","password":"123456","phone":"15748574147","sex":"女","userName":"wangbingbing"}}