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']]