使用fastjson将对象和字符串进行转换

依赖包：

        <dependency>

            <groupId>com.alibaba</groupId>

            <artifactId>fastjson</artifactId>

            <version>1.2.54</version>

        </dependency>

范例代码：

 package org.study2.tools.json.fastjson;

 import com.alibaba.fastjson.JSON;

 import org.study2.bean.User;

 import java.util.ArrayList;

 import java.util.List;

 /**

  * @Description: 使用fastjson将对象和字符串进行转换

  **/

 public class FastjsonDemo {

     public static void main(String[] args) {

         //    测试数据

         User userDemo = new User("tom", 25, "NO.1 street");

         String jsonStr = "{\"name\":\"Lily\",\"age\":33,\"address\":\"NO.2 street\"}";

 //    json转JavaBean

         User user1 = JSON.parseObject(jsonStr, User.class);

         System.out.println("1、json转JavaBean：" + user1);

 //    JavaBean转json

         String jsonUser = JSON.toJSONString(userDemo);

         System.out.println("2、JavaBean转json：" + jsonUser);

 //        将对象集合转换成为字符串

         List<User> list = new ArrayList<>();

         list.add(user1);

         list.add(userDemo);

         String jsonUsers = JSON.toJSONString(list);

         System.out.println("3、将对象集合转换成为字符串：" + jsonUsers);

 //        将字符串转换成为对象集合

         List<User> usersList = JSON.parseArray(jsonUsers,User.class);

         System.out.println("4、将字符串转换成为对象集合：" + usersList);

     }

 }

运行结果：

1、json转JavaBean：User[name='Lily', age=33, address='NO.2 street']

2、JavaBean转json：{"address":"NO.1 street","age":25,"name":"tom"}

3、将对象集合转换成为字符串：[{"address":"NO.2 street","age":33,"name":"Lily"},{"address":"NO.1 street","age":25,"name":"tom"}]

4、将字符串转换成为对象集合：[User[name='Lily', age=33, address='NO.2 street'], User[name='tom', age=25, address='NO.1 street']]