javaweb项目文件上传

需求：手机端请求uploadFile接口上传文件，并附带了文件的后缀名suffix（jpg,pdf等）
处理步骤：获取request的二进制流文件，调用saveFile传入流和后缀名保存本地

    @RequestMapping(value = "/uploadFile/{suffix}")
    public void uploadFile(HttpServletRequest request, HttpServletResponse response,@PathVariable(name = "suffix") String suffix) throws IOException {
        InputStream is = request.getInputStream();
        DataInputStream dis = new DataInputStream(is);
        String result = "";
        try {
            result = saveFile(dis,suffix);
        } catch (Exception e) {
            e.printStackTrace();
        }
        PrintWriter out = response.getWriter();
        out.append(result);
        dis.close();
        is.close();
    }

    /**
     * 保存文件
     * @param dis
     * @return string
     */
    private String saveFile(DataInputStream dis,String suffix) {
    	//文件保存路径，采用系统时间戳避免文件名重复
        String fileurl = "C:\\Users\\Le\\Desktop\\"+System.currentTimeMillis()+"."+suffix;
        File file = new File(fileurl);
        if (!file.exists()) {
            try {
                file.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        FileOutputStream fps = null;
        try {
            fps = new FileOutputStream(file);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        int bufferSize = 1024;
        byte[] buffer = new byte[bufferSize];
        int length = -1;
        try {
            while ((length = dis.read(buffer)) != -1) {
                fps.write(buffer, 0, length);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            fps.flush();
            fps.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return fileurl;
    }