SpringMVC 上传和下载核心代码

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1.在springmvc.xml 中配置相应的文件解析器

 <!-- 文件上传解析器 --><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">    <property name="maxUploadSize" value="10240000"></property></bean>

2. 在Controller 中上传与下载处理

上传:

   /**     * 多文件文件上传处理      * 接受Android 端所传递的数据     */    @RequestMapping(value = "/accept.do")    public void accept(HttpServletRequest request, HttpServletResponse response) throws IOException {        String realPath = request.getServletContext().getRealPath("");        String PK = request.getParameter("PK");        File file = new File(realPath + "/upload/" + PK);        if (!file.exists()) {            file.mkdirs();        }        MultipartHttpServletRequest mh = (MultipartHttpServletRequest) request;        for (int i = 0; i < FILE_NAMES.length; i++) {            MultipartFile mf = mh.getFile(FILE_NAMES[i]);            FileOutputStream fos = new FileOutputStream(realPath + "/upload/" + PK + "/" + FILE_NAMES[i] + ".json");            IOUtils.copy(mf.getInputStream(), fos);            fos.close();        }    }

下载：

   /**     * PC 端的 下载处理     */    @RequestMapping("/download.do")    public ResponseEntity<byte[]> download(HttpServletRequest request,                                           @RequestParam("filename") String filename,                                           Model model) throws Exception {        String PK = request.getParameter("PK");        filename = request.getParameter("filename");        if (StringUtils.isEmpty(PK) || StringUtils.isEmpty(filename)) {            return null;        }        String realPath = request.getServletContext().getRealPath("");        File file = new File(realPath + "/upload/" + PK + "/" + filename);        HttpHeaders headers = new HttpHeaders();        //下载显示的文件名，解决中文名称乱码问题        String downloadFielName = new String(filename.getBytes("UTF-8"), "iso-8859-1");        //通知浏览器以attachment（下载方式）打开图片        headers.setContentDispositionFormData("attachment", downloadFielName);        //application/octet-stream ： 二进制流数据（最常见的文件下载）。        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),                headers, HttpStatus.CREATED);    }

源码下载地址：
http://download.csdn.net/download/qq_21434959/10113352

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