java中实体类和JSON对象之间相互转化

JSON串有两种格式：JSONObject、JSONArray，数据格式如下：

JSONObject:{"address":"昌平区","postNum":"100000","name":"志刚"}

JSONArray:[{"address":"西城区","postNum":"100001","name":"张三"}]

    /**
   * <p>
   *    JSONObject测试
   * </p>
   * @return
   */
   public void jsonObjectTest(){
       List userInfosList = new ArrayList<UserInfo>();
       UserInfo u1 = new UserInfo();
       u1.setUserId(10000);
       u1.setUserName("柳");
       u1.setPassword("liumengli");
       UserInfo u2 = new UserInfo();
       u2.setUserId(10001);
       u2.setUserName("韩");
       u2.setPassword("hanlingsha");
       UserInfo u3 = new UserInfo();
       u3.setUserId(10002);
       u3.setUserName("云");
       u3.setPassword("yuntianhe");
       UserInfo u4 = new UserInfo();
       u4.setUserId(10003);
       u4.setUserName("玄");
       u4.setPassword("xuanxiao");
       userInfosList.add(u1);
       userInfosList.add(u2);
       userInfosList.add(u3);
       userInfosList.add(u4);
       Map map=new HashMap();
       map.put("newData", userInfosList);
       JSONObject jsonObject=JSONObject.fromObject(map);
       System.out.println(jsonObject);

   }

REF

https://www.jb51.net/article/65855.htm

https://www.cnblogs.com/Yasha/p/6268562.html

https://blog.csdn.net/tjcyjd/article/details/7007487