图片压缩上传mongodb和下载

刺骨的言语ヽ痛彻心扉 2022-04-22 13:00 236阅读 0赞

>     // 获得SpringBoot提供的mongodb的GridFS对象
>     @Autowired
>     private GridFsTemplate gridFsTemplate;
> 
>     public ServiceResult<FileInfoAO> compressUploadFile(HttpServletRequest request) {
>         try {
>             Part part = request.getPart("file");
>             // 获得提交的文件名
>             String fileName = part.getSubmittedFileName();
>             // 获得文件类型
>             String contentType = part.getContentType();
>             // 获得文件输入流
>             InputStream ins = part.getInputStream();
>             BufferedImage image = Thumbnails.of(ins).scale(1f).outputQuality(0.25f).asBufferedImage();
>             ByteArrayOutputStream os = new ByteArrayOutputStream();
>             ImageIO.write(image, "jpg", os);
>             InputStream is = new ByteArrayInputStream(os.toByteArray());
>             // 将文件存储到mongodb中,mongodb 将会返回这个文件的具体信息
>             GridFSFile gridFSFile = gridFsTemplate.store(is, fileName, contentType);
>             FileInfoAO fileInfo = new FileInfoAO();
>             fileInfo.setContentType(contentType);
>             fileInfo.setFileName(fileName);
>             fileInfo.setMongoFileId(gridFSFile.getId().toString());
>             return ServiceResultHelper.genResultWithSuccess(fileInfo);
>         } catch (Exception e) {
>             return ServiceResultHelper.genResultWithFaild("图片上传失败", -1);
>         }
>     }

Thumbnails 依赖包
    
    <dependency>
        <groupId>net.coobird</groupId>
        <artifactId>thumbnailator</artifactId>
        <version>0.4.8</version>
    </dependency>

> 返回结果取mongoFileId 然后下载
> 
> \{  
>     "succeed": true,  
>     "code": 200,  
>     "subCode": 200,  
>     "msg": "成功",  
>     "data": \{  
>         "contentType": "image/jpeg",  
>         "fileName": "2.jpg",  
>         "mongoFileId": "5bdfb9807f76271da8bac485",  
>         "lastUpdateBy": "25540194153267202"  
>     \},  
>     "additionalProperties": \{\}  
> \}

>     /**
>      * 下载文件
>      *
>      * @param fileId   文件id
>      * @param request
>      * @param response
>      */
>     @Override
>     public void downloadFile(String fileId, HttpServletRequest request, HttpServletResponse response) {
>         Query query = Query.query(Criteria.where("_id").is(fileId));
>         // 查询单个文件
>         GridFSDBFile gfsfile = gridFsTemplate.findOne(query);
>         try {
>             if (gfsfile == null) {
>                 return;
>             }
>             String fileName = gfsfile.getFilename().replace(",", "");
>             //处理中文文件名乱码
>             if (request.getHeader("User-Agent").toUpperCase().contains("MSIE") ||
>                     request.getHeader("User-Agent").toUpperCase().contains("TRIDENT")
>                     || request.getHeader("User-Agent").toUpperCase().contains("EDGE")) {
>                 fileName = java.net.URLEncoder.encode(fileName, "UTF-8");
>             } else {
>                 //非IE浏览器的处理：
>                 fileName = new String(fileName.getBytes("UTF-8"), "ISO-8859-1");
>             }
>             // 通知浏览器进行文件下载
>             response.setContentType(gfsfile.getContentType());
>             response.setHeader("Content-Disposition", "attachment;filename=\"" + fileName + "\"");
>             gfsfile.writeTo(response.getOutputStream());
>         } catch (IOException e) {
>     
>         }
>     }