Springmvc与Mongo GridFs 实现文件的上传和获取

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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)@ResponseBodypublic 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<String> 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<String, Object> hashMap = new HashMap<String, Object>();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：

@Autowiredprivate 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 = "/{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;}

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