Spring MVC + Java 多文件上传及多文件中转上传

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

/*
        接口：http://192.168.1.10:8080/GRSS/yw/api/fileDownload
        -------请求参数----
        path：upload/1505474431679.zip //文件路径 以upload/ 开头
        filename: report.zip , //源文件名
        ------测试用例----
        请求地址：//http://localhost:8888/Cyberspace/main/fileDownload.do?filename=JSSDK中文.html
        获取这个文件：//url = "http://210.14.152.181:8188/examples/JSSDK.html";
    */
    @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();
            }
        }
    }