import cn.hutool.json.JSONUtil;
import com.alibaba.fastjson.JSONObject;

ExamAttend examAttend = new ExamAttend();
examAttend.setExamName("考试");
examAttend.setExamAttendUserUuid("123");
String examAttendStr = JSONUtil.toJsonStr(examAttend);
JSONObject jsonObject = JSONObject.parseObject(examAttendStr);
System.out.println(jsonObject);

输出
{“examName”:“考试”,“examAttendUserUuid”:“123”}

Hutool工具包依赖

<!--Hutool-->
<dependency>
	<groupId>cn.hutool</groupId>
	<artifactId>hutool-all</artifactId>
	<version>5.7.16</version>
</dependency>