Springmvc与Mongo GridFs 实现文件的上传和获取 JavaWeb-Spring

Springmvc与Mongo GridFs 实现文件的上传和获取，最常见的情景莫过于手机客户端实现头像上传

上传文件，代码片段一：

@RequestMapping(method = RequestMethod.POST) @ResponseBody public Object uploadFile(HttpServletRequest request) { CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver( request.getSession().getServletContext()); // 先判断request中是否包涵multipart类型的数据， String fileUrl = ""; if (multipartResolver.isMultipart(request)) { // 再将request中的数据转化成multipart类型的数据 MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request; Iterator iter = multiRequest.getFileNames(); while (iter.hasNext()) { MultipartFile file = multiRequest.getFile((String) iter.next()); if (file != null) { try { GridFSInputFile inputFile = fileService.save(file.getInputStream(), file.getOriginalFilename()); if (inputFile == null) { return StatusConfig.FileUploadError; } else { fileUrl = inputFile.getId().toString(); } } catch (IllegalStateException | IOException e) {} } } HashMap hashMap = new HashMap(); fileUrl = this.getHttpFilePath() + fileUrl; hashMap.put(ConstantsKey.STATUS, 200); hashMap.put(ConstantsKey.DATA, fileUrl); String json = ConvertUtils.as().toJson(hashMap); System.out.println("photourl:" + json); return json; } else {} }

上传文件，代码片段二：

@Autowired private MongoDbFactory mongodbfactory; /** * 用给出的id，保存文件，透明处理已存在的情况 * id 可以是string，long，int，org.bson.types.ObjectId 类型 * @param in * @param id */ public GridFSInputFile save(InputStream in, Object id){ GridFS gridFS = new GridFS(mongodbfactory.getDb()); GridFSInputFile gridFSInputFile = gridFS.createFile(in); gridFSInputFile.save(); return gridFSInputFile; }

通过Http请求文件

@RequestMapping(value = "https://www.it610.com/{id}", method = RequestMethod.GET) public void getFile(@PathVariable String id, HttpServletResponse response) { GridFSDBFile file = fileService.getById(new ObjectId(id)); OutputStream os = null; try { os = response.getOutputStream(); os.write(FileUtils.readInputStream(file.getInputStream())); os.flush(); } catch (Exception e) { e.printStackTrace(); } }

请求文件代码片段2：

/** * 据id返回文件 */ public GridFSDBFile getById(Object id){ DBObject query= new BasicDBObject("_id", id); GridFS gridFS = new GridFS(mongodbfactory.getDb()); GridFSDBFile gridFSDBFile = gridFS.findOne(query); return gridFSDBFile; }

【Springmvc与Mongo GridFs 实现文件的上传和获取】