Spring MVC + Java 多文件上传及多文件中转上传-文件上传

1.html内容

<div>
 <form method="post" action="/Cyberspace/main/informationBatchAdd.do" enctype="multipart/form-data">
 <input type="file" id="excelFile" multiple="multiple" name="file"/>
 <button type="submit">批量上传</button>
 </form>
</div>

2.服务端后台支持多文件上传的接口

 /**
 * 信息上报批量增加
 */
 @RequestMapping(value = "informationBatchAdd", method = RequestMethod.POST)
 @ResponseBody
 public JSONResult informationBatchAdd(MultipartHttpServletRequest request) {
 JSONResult jsonResult;
 try {
 Integer result = 0;
 MultiValueMap<String, MultipartFile> multiValues = request.getMultiFileMap();//获取请求中所有的文件流
 Iterator<Map.Entry<String, List<MultipartFile>>> iterator = multiValues.entrySet().iterator();
 while (iterator.hasNext()) {
 Map.Entry<String, List<MultipartFile>> entry = iterator.next();
 for (MultipartFile file : entry.getValue()) {
 InputStream in = file.getInputStream();//转换成输入流
 XSSFWorkbook readWb = new XSSFWorkbook(in);
 for (int i = 0; i < readWb.getNumberOfSheets(); i++) {//遍历该表格中所有的工作表，i表示工作表的数量 getNumberOfSheets表示工作表的总数
 XSSFSheet sheet = readWb.getSheetAt(i);
 。。。
 Integer totalRow = sheet.getLastRowNum();//获取excel共有多少行
 for (int rowNum = 1; rowNum <= totalRow; rowNum++) { // 循环行Row
 XSSFRow hssfRow = sheet.getRow(rowNum);
 if (hssfRow != null && hssfRow.getPhysicalNumberOfCells() >= 7) {//getPhysicalNumberOfCells 获取纵列数
 。。。
 }
 }
 result += 。。。;
 }
 }
 }
 jsonResult = new JSONResult(CODE_SUCCESS, MSG_SUCCESS, result);//JSONResult是自己定义的一个类
 } catch (Exception e) {
 jsonResult = new JSONResult(CODE_FAIL, MSG_FAIL, null);
 e.printStackTrace();
 }
 return jsonResult;
 }

3.假如遇到要中转上传文件流到以上的接口中,那么下面的内容就是你的福音

 /**
 * 中转文件
 *
 * @param files 上传的文件，该参数的获取 request.getFiles("xxxx")或者参照第二步中的方法
 * @return 响应结果
 */
 public static String httpClientUploadFile(List<MultipartFile> files, String remoteUrl) {
 final String remote_url = remoteUrl;// 第三方服务器请求地址
 CloseableHttpClient httpClient = HttpClients.createDefault();
 String result = "";
 try {
 HttpPost httpPost = new HttpPost(remote_url);
 MultipartEntityBuilder builder = MultipartEntityBuilder.create();
 builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);//设置浏览器兼容模式
 for (int i = 0; i < files.size(); i++) {
 MultipartFile file = files.get(i);
 String fileName = file.getOriginalFilename();
 builder.addBinaryBody("file" + i, file.getInputStream(), ContentType.MULTIPART_FORM_DATA, fileName);// 文件流
 builder.addTextBody("filename", fileName);// 类似浏览器表单提交，对应input的name和value
 }
 HttpEntity entity = builder.build();
 httpPost.setEntity(entity);
 HttpResponse response = httpClient.execute(httpPost);// 执行提交
 HttpEntity responseEntity = response.getEntity();
 result = EntityUtils.toString(responseEntity, UTF8);
 } catch (IOException e) {
 e.printStackTrace();
 } catch (Exception e) {
 e.printStackTrace();
 } finally {
 try {
 httpClient.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 return result;
 }

4.中转下载文件

 @RequestMapping(value = "fileDownload", method = RequestMethod.GET)
 @ResponseBody
 public String fileDownload(HttpServletRequest request, HttpServletResponse response) {
 String url;
 try {
 String fileName = StringUtils.isNotEmpty(request.getParameter("filename")) ? request.getParameter("filename") : new Date().getTime() + "";
 fileName = new String(fileName.getBytes("ISO8859-1"),"UTF-8");//解决中文get方式乱码的问题url = "http://192.168.1.100:8188/examples/JSSDK.html";//我想下载这个JSSDK这个html文件
 FileUtil.downloadFileFromNet(url, fileName, response);
 } catch (Exception e) {
 e.printStackTrace();
 }
 return null;
 }

　　/** FiletUtil.downloadFileFromNet
 * 从网络中下载文件
 */
 public static void downloadFileFromNet(String urlPath, String fileName, HttpServletResponse response) throws MalformedURLException {
 InputStream fis = null;
 OutputStream os = null;
 try {
 URL url = new URL(urlPath);
 URLConnection urlConnection = url.openConnection();
 // 以流的形式下载文件
 fis = new BufferedInputStream(urlConnection.getInputStream());
 // 设置响应报头
 response.reset();
 response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, ENCODING));
 response.setCharacterEncoding(ENCODING);
 // 写入响应流数据
 os = new BufferedOutputStream(response.getOutputStream());
 byte[] bytes = new byte[1024];
 while (fis.read(bytes) != -1) {
 os.write(bytes);
 }
 } catch (Throwable e) {
 e.printStackTrace();
 } finally {
 try {
 if (os != null) {
 os.close();
 }
 if (fis != null) {
 fis.close();
 }
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 }