json转换成对象

一.gson

<dependency>
   <groupId>com.google.code.gson</groupId>
   <artifactId>gson</artifactId>
   <version>2.2.4</version>
</dependency>

//1、创建Gson对象  

Gson gson = new Gson();  

User user = new User(1, "liujinghan", "123456", "[e-mail]"); 

 //2、调用toJson(Object)将对象转为字符串  String json = gson.toJson(user); 

 //{"id":1,"username":"liujinghan","password":"123456","email":"[e-mail]"} 

 System.out.println(json);  

//3、将json字符串封装为java对象[json字符串 的属性名要和javabean的属性一样]  

User user2 = gson.fromJson(json, User.class); 

 System.out.println(user2);

二.JSONObject

　　例如：

UnZip unZip = (UnZip) JSONObject.toBean(JSONObject.fromObject(string.toString()),UnZip.class);