客户端发一个post请求

 public static String doPostStr(String httpUrl, String str) {
         HttpPost httpPost = null;
         try {
             HttpClient client = getHttpClient();
             httpPost = new HttpPost(httpUrl);
             StringEntity entity = new StringEntity(str);
             entity.setContentType("application/x-www-form-urlencoded");
             entity.setContentEncoding("utf-8");

             httpPost.setEntity(entity);

             HttpResponse response = client.execute(httpPost);
             String result = EntityUtils.toString(response.getEntity(), DEFAULT_CHARSET);
             return result;
         } catch (Exception e) {
             logger.error("http post is error," + e.getMessage(), e.fillInStackTrace());
         } finally {
             httpPost.releaseConnection();
         }
         return null;
     }