开发功能： 
web前端提交上传文件 —> a服务器接收 —> 转发到b服务器进行文件处理 
下面是简单实现的代码，具体细节优化根本自己的需求更改。

    public String handleResponse(HttpServletRequest request, HttpServletResponse response)throws UnsupportedEncodingException, IOException {String method = request.getMethod();String url = "b服务器的api url";if (method.equals("POST")) { String contentType = "application/json; charset=UTF-8"; if (request.getContentType() != null) contentType = request.getContentType();// 会获取到空指针 Map<String, String[]> tmp = new HashMap(request.getParameterMap()); if (contentType.toLowerCase().startsWith("multipart/")) { MultipartHttpServletRequest multipartRequest = WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class); MultipartFile file = multipartRequest.getFile("file"); return httpClientUpload(url, file, tmp); } } return null; }

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public String httpClientUpload(String url, MultipartFile file, Map<String, String[]> params)throws ClientProtocolException, IOException {HttpClient httpclient = new DefaultHttpClient();// 请求处理页面 HttpPost httppost = new HttpPost(url); // 创建待处理的文件 String fileName = file.getOriginalFilename(); ContentBody files = new ByteArrayBody(file.getBytes(), fileName); // 对请求的表单域进行填充 MultipartEntity reqEntity = new MultipartEntity(); reqEntity.addPart("file", files); if (params != null) {//这里草草处理values[] for (String key : params.keySet()) { String[] values = params.get(key); for (int i = 0; i < values.length; i++) { String value = values[i]; try { value = URLEncoder.encode(value, "UTF-8"); reqEntity.addPart(key, new StringBody(value)); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } // 设置请求 httppost.setEntity(reqEntity); // 执行 HttpResponse response = httpclient.execute(httppost); if (HttpStatus.SC_OK == response.getStatusLine().getStatusCode()) { HttpEntity entity = response.getEntity(); return EntityUtils.toString(entity, Charset.forName("UTF-8")); } return null; }

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