实体类的json和对象转换工具类

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;

    @TableLogic
    private 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;
}