import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.annotation.JSONField;
import lombok.Data;

@Data
public class Stu {

    private String name;
    //下划线自动转换
    private String alias_name;

    //下划线自动转换
//    @JSONField(name="pen_name")
    private String penName;

    //实体类转为json，使用注解name值
    @JSONField(name="pen_name2")
    private String penName2;


    private String pseudonym;

    //实体类转为json，使用注解name值
    @JSONField(name="pseud")
    //不使用注解为属性名{"penName":"333","name":"1111","alias_name":"222","pen_name2":"444","pseudonym":"555"}
    public String getPseudonym() {
        return pseudonym;
    }

    //json转为实体类，使用注解name值
    @JSONField(name="pseudo")
    public void setPseudonym(String pseudonym) {
        this.pseudonym = pseudonym;
    }

    public static void main(String[] args) {
        String json = "{‘name‘:‘1111‘,‘aliasName‘:‘222‘,‘pen_name‘:‘333‘,‘pen_name2‘:‘444‘,‘pseudo‘:‘555‘}";
        Stu stu = JSON.parseObject(json, Stu.class);

        System.out.println(stu);
        System.out.println(JSONObject.toJSON(stu));
    }
}

Stu(name=1111, alias_name=222, penName=333, penName2=444, pseudonym=555)
{"pseud":"555","penName":"333","name":"1111","alias_name":"222","pen_name2":"444"}

Process finished with exit code 0