MyBatis-Puls插入或修改时某些字段自动填充操作示例

/**
 * MP注入处理器
 *
 * @author 
 * @date 2021/4/25
 */
@Slf4j
public class CreateAndUpdateMetaObjectHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        try {
            if (ObjectUtil.isNotNull(metaObject) && metaObject.getOriginalObject() instanceof BaseEntity) {
                BaseEntity baseEntity = (BaseEntity) metaObject.getOriginalObject();//获得当前要进行sql操作的实体类
                Date current = ObjectUtil.isNotNull(baseEntity.getCreateTime())
                    ? baseEntity.getCreateTime() : new Date();
                baseEntity.setCreateTime(current);
                baseEntity.setUpdateTime(current);
                String username = StringUtils.isNotBlank(baseEntity.getCreateBy())
                    ? baseEntity.getCreateBy() : getLoginUsername();
                // 当前已登录 且 创建人为空 则填充
                baseEntity.setCreateBy(username);
                // 当前已登录 且 更新人为空 则填充
                baseEntity.setUpdateBy(username);
            }
        } catch (Exception e) {
            throw new ServiceException("自动注入异常 => " + e.getMessage(), HttpStatus.HTTP_UNAUTHORIZED);
        }
    }
    @Override
    public void updateFill(MetaObject metaObject) {
        try {
            if (ObjectUtil.isNotNull(metaObject) && metaObject.getOriginalObject() instanceof BaseEntity) {
                BaseEntity baseEntity = (BaseEntity) metaObject.getOriginalObject();//获得当前要进行sql操作的实体类
                Date current = new Date();
                // 更新时间填充(不管为不为空)
                baseEntity.setUpdateTime(current);
                String username = getLoginUsername();
                // 当前已登录 更新人填充(不管为不为空)
                if (StringUtils.isNotBlank(username)) {
                    baseEntity.setUpdateBy(username);
                }
            }
        } catch (Exception e) {
            throw new ServiceException("自动注入异常 => " + e.getMessage(), HttpStatus.HTTP_UNAUTHORIZED);
        }
    }
    /**
     * 获取登录用户名
     */
    private String getLoginUsername() {
        LoginUser loginUser;
        try {
            loginUser = LoginHelper.getLoginUser();
        } catch (Exception e) {
            log.warn("自动注入警告 => 用户未登录");
            return null;
        }
        return ObjectUtil.isNotNull(loginUser) ? loginUser.getUsername() : null;
    }
}

/**
 * Entity基类
 *
 * @author
 */
@Data
public class BaseEntity implements Serializable {
    private static final long serialVersionUID = 1L;
    /**
     * 搜索值
     */
    @JsonIgnore
    @TableField(exist = false)
    private String searchValue;
    /**
     * 创建者
     */
    @TableField(fill = FieldFill.INSERT) //创建时自动填充
    private String createBy;
    /**
     * 创建时间
     */
    @TableField(fill = FieldFill.INSERT)
    private Date createTime;
    /**
     * 更新者
     */
    @TableField(fill = FieldFill.INSERT_UPDATE) //创建 or 修改时自动填充
    private String updateBy;
    /**
     * 更新时间
     */
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Date updateTime;
    /**
     * 请求参数
     */
    @JsonInclude(JsonInclude.Include.NON_EMPTY)
    @TableField(exist = false)
    private Map<String, Object> params = new HashMap<>();
}