httpclient 實現檔案上傳中轉

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開發功能： 
web前端提交上傳檔案 —> a伺服器接收 —> 轉寄到b伺服器進行檔案處理 
下面是簡單實現的代碼，具體細節最佳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伺服器的api url";        if (method.equals("POST")) {            String contentType = "application/json; charset=UTF-8";            if (request.getContentType() != null)                contentType = request.getContentType();// 會擷取到null 指標            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);        // 建立待處理的檔案        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) {//這裡草草處理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();                    }                }            }        }        // 佈建要求        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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httpclient 實現檔案上傳中轉