json转java对象 和 java对象转json 的方法 (一个类renturn的数据 映射到另外一个类接收)

背景:

　　发现A类返回的json可以映射到B类里面，然后就进行测试

XX类

import lombok.Data;

@Data
public class xx {

    private String a;
    private String b;

    public xx(){};

    public xx(String a ,String b){
        this.a=a;
        this.b=b;
    };


}

Tub类

package com.example.number;
import lombok.Data;

@Data
public class Tub {
    private String a;
    private String b;

    public Tub(){};

    public Tub(String a , String b){
        this.a=a;
        this.b=b;
    };

test 测试文件

import com.alibaba.fastjson.JSONObject;

public static void main(String[]args){
        Tub Tub =new Tub("张三","李四");
        System.out.println(Tub);
//        java类转json字符串
        String Tubjson=JSONArray.toJSONString(Tub);
        System.out.println(Tubjson);
//        json字符串转java类
        xx xx = JSONObject.parseObject(Tubjson,xx.class);
        System.out.println(xx);
    }

终端输出

Tub(a=张三, b=李四)
{"a":"张三","b":"李四"}
xx(ab=null, b=李四)

主要这2句

java类转json字符串

String Tubjson= JSONObject.toJSONString(Tub);

json字符串转java类
xx xx = JSONObject.parseObject(Tubjson,xx.class);

maven依赖

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.59</version>
        </dependency>

　　

参考: https://blog.csdn.net/kswkly/article/details/106984153?utm_term=fastjson%E5%AD%97%E7%AC%A6%E4%B8%B2%E8%BD%AC%E6%88%90%E5%AF%B9%E8%B1%A1&utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~all~sobaiduweb~default-0-106984153&spm=3001.4430