/**

      * post 方法

      * @param  url

      * @param params

      * @return

      */

     public static String post(String url, Object content, String encode) throws Exception {

         byte[] responseBody = null;

         HttpClient httpclient = new HttpClient();

         PostMethod httpPost = new PostMethod(url);

         // 设置连接超时时间(单位毫秒)

         httpclient.getHttpConnectionManager().getParams().setConnectionTimeout(60000);

         // 设置读数据超时时间(单位毫秒)

         httpclient.getHttpConnectionManager().getParams().setSoTimeout(60000);

         try {

             httpPost.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,new DefaultHttpMethodRetryHandler(3, false));

             // servlet

             if (content instanceof Map) {

                 @SuppressWarnings("unchecked")

                 Map<String, String> map = (Map<String, String>)content;

                 NameValuePair[] param = new NameValuePair[map.size()];

                 int index = 0;

                 for (Map.Entry<String, String> entry : map.entrySet()) {

                     param[index] = new NameValuePair(entry.getKey(),URLEncoder.encode(entry.getValue(), "GBK"));

                 }

                 httpPost.setRequestBody(param);

             }

             // rest

             else {

                 httpPost.setRequestEntity(new StringRequestEntity((String)content,"plain/text", encode));

             }

             // post

             int statusCode = httpclient.executeMethod(httpPost);

             // success

             if (statusCode == HttpStatus.SC_OK) {

                 responseBody = httpPost.getResponseBody();

             }

             // failure

             else {

             }

         } catch (HttpException e) {

             throw new Exception(e.getMessage());

         } catch (IOException e) {

             throw new Exception(e.getMessage());

         } catch (Exception e) {

             throw new Exception(e.getMessage());

         } finally {

             httpPost.releaseConnection();

         }

         return new String(responseBody, encode);

     }