Java对象与json的转换使用的依赖是fastjson，转换的简单案例

<dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.47</version>
</dependency>

package com.hh.json;

import com.alibaba.fastjson.JSON;
import com.hh.pojo.User;

/**
 * @author yangLiHua
 * @version 1.0
 * @DATE 2023-09-04 16:57:04
 */
public class TestJson {
    public static void main(String[] args) {
        //先创建一个对象
        User user = new User();
        user.setId(1);
        user.setUsername("zhangsan");
        user.setPassword("123");
        //将Java对象转换为json
        Object o = JSON.toJSON(user);
        System.out.println("o = " + o);
        //将json对象转换为Java对象
        User user1 = JSON.parseObject("{\"password\":\"123\",\"id\":1,\"username\":\"zhangsan\"}", User.class);
        System.out.println("user1 = " + user1);
        
        
    }
}