与使用相同服务器端服务的iPhone App相比,HttpURLConnection.getInputStream需要很长时间.

以下代码用于服务：

         date= new java.util.Date();             
         Log.d("time","Time Stamp before posting  "+new Timestamp(date.getTime()));

         URL ur= new URL(url);           
         HttpURLConnection conn = (HttpURLConnection) ur.openConnection();
         conn.setRequestProperty("Connection", "close");
         conn.setReadTimeout(10000);
         conn.setConnectTimeout(15000);
         conn.setRequestMethod("POST");
         conn.setDoInput(true);
         conn.setDoOutput(true);             
         OutputStream os = conn.getOutputStream();
         BufferedWriter writer = new BufferedWriter(
                 new OutputStreamWriter(os, "UTF-8"));
         writer.write(getQuery(nameValuePairs));
         writer.close();
         os.close();
         conn.connect();

         StringBuffer response=null;             
         try{           
             Log.d("time","Time Stamp bfr InputStream  "+new Timestamp(date.getTime()));    

             InputStream is = conn.getInputStream();

             date= new java.util.Date();             
             Log.d("time","Time Stamp aftr InputStream  "+new Timestamp(date.getTime()));            

             BufferedReader rd = new BufferedReader(new InputStreamReader(is));
             String line;
             response = new StringBuffer(); 
             while((line = rd.readLine()) != null) {
                 response.append(line);
                 response.append('\r');
             }
             rd.close();
             response.toString();
             result=response.toString();

         } catch (Exception e) {

        }

要检查服务花费时间的位置,我将日志条目打印到TimeStamp.

该过程的平均时间如下：

Average time for posting to server takes less than 2 Mil seconds
Average time for creating input stream takes almost 5 seconds

Average time for writing response is less than 2 mil seconds.

有什么想法为什么输入流需要很长时间才能使整个服务变得非常慢？

解决方法:

你没有衡量你认为自己在测量什么.在调用getInputStream()或getResponseCode()之前,不会将任何内容写入服务器.所以你真的在测量：

>连接时间
>传输时间
>在服务器上处理时间

当你认为你只是在测量getInputStream()时.

原因是HttpURLConnection通过缓冲所有输出来自动设置内容长度标头.您可以通过使用分块传输模式来避免这种情况.那么至少你会看到时间的真正去向.