public  String sendMsg(String url, byte[] PostData) {

         String content = null;

         URL urls = null;

         try {

         urls = new URL(url);

         HttpURLConnection httpURLConnection = (HttpURLConnection) urls .openConnection();

          // 设置连接时间

         httpURLConnection.setConnectTimeout(3000);

         // 打开输入流，以便从服务器获取数据

         httpURLConnection.setDoInput(true);

         // 打开输出流，以便向服务器提交数据

         httpURLConnection.setDoOutput(true);

          // 设置以POST方式提交数据

         httpURLConnection.setRequestMethod("POST");

         // 使用POST不能使用缓存

         httpURLConnection.setUseCaches(false);

         // 设置请求的类型是文本类型

         httpURLConnection.setRequestProperty("Content-Type",

         "application/x-www-form-urlencoded");

         // 设置请求体的长度

         httpURLConnection.setRequestProperty("Content-Length",

         String.valueOf(PostData.length));

         // 获得输出流，向指定的Url写入数据

         OutputStream outputStream = httpURLConnection.getOutputStream();

         outputStream.write(PostData);

         int response = httpURLConnection.getResponseCode();

                 // 获得服务器响应码

         if (response == HttpURLConnection.HTTP_OK) {

         InputStream inputStream= httpURLConnection.getInputStream();

         BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "gbk"));

                         StringBuilder builder = new StringBuilder();

                         String line = null;

                         while ((line = reader.readLine()) != null) {

                             builder.append(line).append("\n");

                         }

                         content = builder.toString();

                     }

         }catch (IOException e) {

         e.printStackTrace();

         }

         return content;

         }