json_0">实体类的json/对象转换工具类

以下以QuestionVo为例，对其中的tags和judgeConfig字段进行json和对象的转换.

场景：在与前端交互中，tags和judgeConfig需要存储多个数据或字段，所以在QuestionVo中分别为List和JudgeConfig类型。而在数据库的存储中，tags标签有多个数据，为避免库中数据的冗余，先将其转成json字符串在存入数据库；JudgeConfig类中的字段在开发过程中不确定因素较多，为方便对字段进行扩展和修改，将其转成json字符串再存入数据库。

QuestionVo实体类

/*** 题目封装类* @TableName question*/
@Data
public class QuestionVO implements Serializable {private Long id;private String title;private String content;private List<String> tags;private Integer submitNum;private Integer acceptedNum;private JudgeConfig judgeConfig;private Integer thumbNum;private Integer favourNum;private Long userId;private Date createTime;private Date updateTime;private UserVO userVO;/*** 包装类转对象** @param questionVO* @return*/public static Question voToObj(QuestionVO questionVO) {if (questionVO == null) {return null;}Question question = new Question();BeanUtils.copyProperties(questionVO, question);List<String> tagList = questionVO.getTags();if (tagList != null) {question.setTags(JSONUtil.toJsonStr(tagList));}JudgeConfig voJudgeConfig = questionVO.getJudgeConfig();if (voJudgeConfig != null) {question.setJudgeConfig(JSONUtil.toJsonStr(voJudgeConfig));}return question;}/*** 对象转包装类** @param question* @return*/public static QuestionVO objToVo(Question question) {if (question == null) {return null;}QuestionVO questionVO = new QuestionVO();BeanUtils.copyProperties(question, questionVO);List<String> tagList = JSONUtil.toList(question.getTags(), String.class);questionVO.setTags(tagList);String judgeConfigStr = question.getJudgeConfig();questionVO.setJudgeConfig(JSONUtil.toBean(judgeConfigStr, JudgeConfig.class));return questionVO;}private static final long serialVersionUID = 1L;
}

Question实体类

/*** 题目* @TableName question*/
@TableName(value ="question")
@Data
public class Question implements Serializable {@TableId(type = IdType.ASSIGN_ID)private Long id;private String title;private String content;private String tags;private String answer;private Integer submitNum;private Integer acceptedNum;private String judgeCase;private String judgeConfig;private Integer thumbNum;private Integer favourNum;private Long userId;private Date createTime;private Date updateTime;@TableLogicprivate Integer isDelete;@TableField(exist = false)private static final long serialVersionUID = 1L;
}

JudgeConfig实体类

/*** 题目配置*/
@Data
public class JudgeConfig {private Long timeLimit;private Long memoryLimit;private Long stackLimit;
}