httpclient 實現文件上傳中轉

開發功能： 
web前端提交上傳文件 —> a服務器接收 —> 轉發到b服務器進行文件處理 
下面是簡單實現的代碼，具體細節優化根本本身的需求更改。

public String handleResponse(HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException, IOException { String method = request.getMethod(); String url = "b服務器的api url"; if (method.equals("POST")) { String contentType = "application/json; charset=UTF-8"; if (request.getContentType() != null) contentType = request.getContentType();// 會獲取到空指針 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(); // 請求處理頁面 HttpPost httppost = new HttpPost(url); // 建立待處理的文件 String fileName = file.getOriginalFilename(); ContentBody files = new ByteArrayBody(file.getBytes(), fileName); // 對請求的表單域進行填充 MultipartEntity reqEntity = new MultipartEntity(); reqEntity.addPart("file", files); if (params != null) {//這裏草草處理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(); } } } } // 設置請求 httppost.setEntity(reqEntity); // 執行 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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