SpringMVC结合Ajaxfileupload异步多文件上传至远程服务器详解编程语言

项目中我们可能会使用到异步上传并且有时需要是异步的，那么Ajaxfileupload是一个不错的选择,最近刚 做了一个多文件上传到远程服务器，远程服务器提供接口，当远程服务器上传结束后返回一个文件的服务器地址。分享出来给有需要的参考 下，Ajaxfileupload默认是一次只能上传一个文件的，所以需要稍稍修改下他的源码就可以上传多个文件，这里就不多说，百度一下自然就知道。

<input type="file" id="playeraddress" name="playeraddress" /> 
<input type="file" id="cover" name="cover" /> 
//这里就是两个file id自己定义

$.ajaxFileUpload({ 
    url : web_path+'upload/upload.do', 
    secureuri : false, 
    data : data,//需要传递的数据 json格式 
    fileElementId :['playeraddress','cover'], 
    dataType : 'json', 
    success : function(data) { 
           //上传成功后的回调。 
    }, 
    error : function(data) { 
    } 
});

/** 
     * 
     *  
     * @param request 
     * @param response 
     * @param audioItem 
     * @return 
     */ 
    @RequestMapping(value = "/upload.do", method = { RequestMethod.POST }) 
    @ResponseBody 
    public String addMusic(HttpServletRequest request, 
            HttpServletResponse response, AudioItem audioItem) { 
        //这里无需理会，这只是 
        String uploadFileUrl = GlobalUtil .getValue("upload_audioItem_audio_url"); 
        String uploadIconUrl = GlobalUtil.getValue("upload_audioItem_pic_url"); 
 
        CommonsMultipartResolver resolver = new CommonsMultipartResolver( 
                request.getServletContext()); 
        if (resolver.isMultipart(request)) { 
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request; 
            // 取得request中的所有文件名 
            Iterator<String> iter = multiRequest.getFileNames(); 
            while (iter.hasNext()) { 
                String fileName = iter.next(); 
                // 取得上传文件 
                MultipartFile file = multiRequest.getFile(fileName); 
                /** 
                 * 获取文件名 
                 */ 
                String originalFilename = file.getOriginalFilename(); 
                 
                if ("playeraddress".equals(fileName)&&!"".equals(originalFilename)) { 
                    try { 
                        //这里的upload方法就是以http post的方式上传文件的 稍后贴出 
                        String url = BaseService.upload(uploadFileUrl, 
                                file.getOriginalFilename(), 
                                file.getInputStream()); 
                    } catch (IOException e) { 
                        // TODO Auto-generated catch block 
                        e.printStackTrace(); 
                    } 
                } 
                if ("cover".equals(fileName)&&!"".equals(originalFilename)){ 
                    try { 
                        String icon = BaseService.upload(uploadIconUrl, 
                                file.getOriginalFilename(), 
                                file.getInputStream()); 
                    } catch (IOException e) { 
                        // TODO Auto-generated catch block 
                        e.printStackTrace(); 
                    } 
                } 
            } 
            //这里需要注意 使用Ajaxfileupload需要使用以下方式返回结果 回调不了success 方法 
            response.setContentType("text/html"); 
   
            try { 
                response.getWriter().write("ok"); 
            } catch (IOException e) { 
                e.printStackTrace(); 
            } 
 
        } 
        return null; 
    }

//最后一步了  
    public static String upload(String httpurl, String fileName, InputStream inputStream) { 
        String result = ""; 
        try { 
            //这里看你的网络环境 按需设置代理  正常都不需要理会 
            if (true) { 
                System.setProperty("http.proxyHost", BaseService.PROXY_IP); 
                System.setProperty("http.proxyPort", BaseService.PROXY_PORT); 
            } 
            String BOUNDARY = "---------7d4a6d158c9"; // 定义数据分隔线 
            URL url = new URL(httpurl); 
            HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
            // 发送POST请求必须设置如下两行 
            conn.setDoOutput(true); 
            conn.setDoInput(true); 
            conn.setUseCaches(false); 
            conn.setRequestMethod("POST"); 
            conn.setRequestProperty("connection", "Keep-Alive"); 
            conn.setRequestProperty("user-agent", 
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)"); 
            conn.setRequestProperty("Charsert", "UTF-8"); 
            conn.setRequestProperty("Content-Type", 
                    "multipart/form-data; boundary=" + BOUNDARY); 
            OutputStream out = new DataOutputStream(conn.getOutputStream()); 
            byte[] end_data = ("/r/n--" + BOUNDARY + "--/r/n").getBytes();// 定义最后数据分隔线 
            StringBuilder sb = new StringBuilder(); 
            sb.append("--"); 
            sb.append(BOUNDARY); 
            sb.append("/r/n"); 
            sb.append("Content-Disposition: form-data;name=/"file" + 1 
                    + "/";filename=/"" + fileName + "/"/r/n"); 
            sb.append("Content-Type:application/octet-stream/r/n/r/n"); 
            byte[] data = sb.toString().getBytes(); 
            out.write(data); 
            DataInputStream in = new DataInputStream(inputStream); 
            int bytes = 0; 
            byte[] bufferOut = new byte[1024]; 
            while ((bytes = in.read(bufferOut)) != -1) { 
                out.write(bufferOut, 0, bytes); 
            } 
            out.write("/r/n".getBytes()); // 多个文件时，二个文件之间加入这个 
            in.close(); 
            out.write(end_data); 
            out.flush(); 
            out.close(); 
            // 定义BufferedReader输入流来读取URL的响应 
            BufferedReader reader = new BufferedReader(new InputStreamReader( 
                    conn.getInputStream())); 
 
            String line = null; 
            while ((line = reader.readLine()) != null) { 
                result+=line; 
            } 
        } catch (Exception e) { 
            System.out.println("发送POST请求出现异常！" + e); 
        }     
        return new JSONObject(result).getString("url"); 
    } 
// 到这就结束了！希望能帮到你。

来自：http://my.oschina.net/pingdy/blog/361833