@RequestMapping(value = "/add", method = RequestMethod.POST)

　　@ResponseBody

    public String addFile(HttpServletRequest request) throws IOException, ServletException {

        request.setCharacterEncoding("UTF-8");

        Part filePart = request.getPart("file");

        String fileName = filePart.getSubmittedFileName();//文件名

        long size = filePart.getSize();//文件大小

        String contentType = filePart.getContentType();//文件的MIME类型

        byte[] data = new byte[(int) size];

        filePart.getInputStream().read(data);//以InputStream表示的文件流信息

        String fileUUID = this.fileService.addFile(fileName, contentType, size, data);

        return fileUUID;

    }