《黑马头条》day03作业

一、素材管理

1.图片删除、收藏与取消

WmMaterialController：

//删除接口
@GetMapping("/del_picture/{id}")
public ResponseResult delPicture(@PathVariable("id") Integer id) {
   return wmMaterialService.delPicture(id);
}

//收藏接口
@GetMapping("/collect/{id}")
    public ResponseResult collect(@PathVariable("id") Integer id) {
        return wmMaterialService.collectOrCancel(id);
    }

//取消收藏接口
    @GetMapping("/cancel_collect/{id}")
    public ResponseResult cancelCollect(@PathVariable("id") Integer id) {
        return wmMaterialService.collectOrCancel(id);
    }

WmMaterialService：

/**
 * 素材图片删除
 * @param id
 * @return
*/
ResponseResult delPicture(Integer id);


/**
     * 收藏或取消收藏
     * @param id
     * @return
     */
    ResponseResult collectOrCancel(Integer id);

WmMaterialServiceImpl:

/**
     * 素材图片删除
     * @param id
     * @return
     */
    @Override
    public ResponseResult delPicture(Integer id) {
        //参数校验
        if (id == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        //判断素材是否存在
        WmMaterial wmMaterial = wmMaterialMapper.selectById(id);
        if (wmMaterial == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.AP_USER_DATA_NOT_EXIST);
        }

        //判断该素材是否被引用，如果是，则返回删除失败
        List<WmNewsMaterial> wmNewsMaterials = wmNewsMaterialMapper.selectList(Wrappers.<WmNewsMaterial>lambdaQuery()
                .eq(WmNewsMaterial::getMaterialId, id));
        if (wmNewsMaterials != null && wmNewsMaterials.size() != 0) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID,"文件删除失败");
        }

        //成功删除 同时删除minio中的文件
        fileStorageService.delete(wmMaterial.getUrl());
        removeById(id);
        return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);
    }



/**
     * 收藏或取消收藏
     * @param id
     * @return
     */
    @Override
    public ResponseResult collectOrCancel(Integer id) {
        if (id == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        WmMaterial wmMaterial = wmMaterialMapper.selectById(id);
        if (wmMaterial == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.DATA_NOT_EXIST);
        }

        if (wmMaterial.getIsCollection() == (short)1) {
            //等于1，说明已经收藏，则取消收藏
            wmMaterial.setIsCollection((short)0);
            updateById(wmMaterial);
            return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);
        }

        //走到这里说明wmMaterial 不为空 且 idCollection == 0
        wmMaterial.setIsCollection((short)1);
        updateById(wmMaterial);
        return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);
    }

二、文章管理

1.查看详情、文章删除、文章上下架

注意！！！！！：

在文章上下架中，老师原来的代码，在WmNewsDto实体类中没有enable属性，需要我们自己加上：private Short enable; （文章上下架接口可以在knife4j中测试）

wmNewsService：

    //查看详情
    @GetMapping("/one/{id}")
    public ResponseResult<WmNews> detail(@PathVariable("id") Integer id) {
        return wmNewsService.detail(id);
    }

    //删除
    @GetMapping("/del_news/{id}")
    public ResponseResult delNews(@PathVariable("id") Integer id) {
        return wmNewsService.delNews(id);
    }

    //文章上下架
    @PostMapping("/down_or_up")
    public ResponseResult downOrUp(@RequestBody WmNewsDto dto) {
        return wmNewsService.downOrUp(dto);
    }

WmNewsService：

    /**
     * 查询文章详情
     * @param id
     * @return
     */
    ResponseResult<WmNews> detail(Integer id);

    /**
     * 删除文章
     * @param id
     * @return
     */
    ResponseResult delNews(Integer id);

    /**
     * 文章上下架
     * @param dto
     * @return
     */
    ResponseResult downOrUp(WmNewsDto dto);

WmNewsServiceImpl:

    /**
     * 根据id查询文章
     * @param id
     * @return
     */
    @Override
    public ResponseResult detail(Integer id) {
        if (id == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }
        WmNews wmNews = wmNewsMapper.selectById(id);
        if (wmNews == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.DATA_NOT_EXIST,"文章不存在");
        }
        return ResponseResult.okResult(wmNews);
    }

    /**
     * 删除文章
     * @param id
     * @return
     */
    @Override
    public ResponseResult delNews(Integer id) {
        if (id == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID,"文章id不可缺少");
        }

        WmNews wmNews = wmNewsMapper.selectById(id);
        if (wmNews == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.DATA_NOT_EXIST,"文章不存在");
        }

        if (wmNews.getStatus().equals(WmNews.Status.PUBLISHED.getCode())) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID,"文章已发布不能删除");
        }

        //删除wm_news表的数据
        wmNewsMapper.deleteById(id);
        //判断在news_material中是否有关联数据
        LambdaQueryWrapper<WmNewsMaterial> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(WmNewsMaterial::getNewsId,id);
        Integer count = wmNewsMaterialMapper.selectCount(queryWrapper);
        if (count > 0) {
            //有则一并删除
            wmNewsMaterialMapper.delete(queryWrapper);
        }
        return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);
    }

    /**
     * 文章上下架
     * @param dto
     * @return
     */
    @Override
    public ResponseResult downOrUp(WmNewsDto dto) {
        //判断id
        if (dto.getId() == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID,"文章id不可缺少");
        }

        //判断有无数据
        WmNews wmNewsDB = wmNewsMapper.selectById(dto.getId());
        if (wmNewsDB == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.DATA_NOT_EXIST,"文章不存在");
        }

        //判断是否已发布
        if (wmNewsDB.getStatus() != WmNews.Status.PUBLISHED.getCode()) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID,"文章未发布不能上架");
        }

        //判断是上架还是下架 -> 0：下 1：上
        if (wmNewsDB.getEnable() == 0) {
            wmNewsDB.setEnable((short)1);
        } else if (wmNewsDB.getEnable() == 1) {
            wmNewsDB.setEnable((short)0);
        }
        updateById(wmNewsDB);
        return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);
    }

这是我写的代码，希望对个位小伙伴能有所帮助，有可以改进的地方欢迎在评论区留言哦。最后希望喜欢的小伙伴可以点点赞和关注支持一下吧，十分感谢。