自动填充字段值

SpringData JPA

https://blog.csdn.net/a3562323/article/details/106386099

MybatisPlus

实现MetaObjectHandler接口

重写插入方法：insertFill和修改方法：updateFill

@Slf4j
public class CreateAndUpdateMetaObjectHandler implements MetaObjectHandler {

    @Override
    public void insertFill(MetaObject metaObject) {
        try {
            if (ObjectUtil.isNotNull(metaObject) && metaObject.getOriginalObject() instanceof BaseEntity) {     //判断对象有没有实现基础类，基础类中含有每张表必须的字段，例如创建时间，创建人等
                BaseEntity baseEntity = (BaseEntity) metaObject.getOriginalObject();
                Date current = ObjectUtil.isNotNull(baseEntity.getCreateTime())     
                    ? baseEntity.getCreateTime() : new Date();  //判断创建时间是否空，不空：拿到这个时间，为空：获取当前时间
                baseEntity.setCreateTime(current);      //填充创建时间
                baseEntity.setUpdateTime(current);      //填充修改时间
                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("填充时间异常 => " + 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();
                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("填充人员异常 => " + 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("获取用户信息失败 => 用户未登录");
            return null;
        }
        return ObjectUtil.isNotNull(loginUser) ? loginUser.getUsername() : null;
    }

}
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Mybatis

https://blog.csdn.net/Ronin_88/article/details/104919913