2013-04-21 76 views
2

我的活动使用AsynTask执行http请求。 如果Web服务器不回答,如何处理HttpResponse? 当前当我的网络服务器关闭时,AsynTask停止在“HttpResponse response = client.execute(httppost);”然后什么都不做。我需要处理这个响应并做一些事情,但是下面的代码“execute”不会被执行。如何在AsyncTask中处理HttpResponse android

这里是纽约后台任务:

protected String doInBackground(String... params) { 
     HttpClient client = new DefaultHttpClient(); 
     String result = null; 
     try { 
      // Add your data 
      List<NameValuePair> postData = new ArrayList<NameValuePair>(2); 
      postData.add(new BasicNameValuePair("session_id", session_id)); 
      postData.add(new BasicNameValuePair("i_key", params[0])); 

      HttpPost httppost = new HttpPost("http://my.webserver.com/getInfo.php"); 
      httppost.setEntity(new UrlEncodedFormEntity(postData)); 

      HttpResponse response = client.execute(httppost); 
      HttpEntity responseEntity = response.getEntity(); 
      if (responseEntity != null) { 
       BufferedReader reader = new BufferedReader(
         new InputStreamReader(responseEntity.getContent(), 
           "UTF-8")); 
       result = reader.readLine().toString(); 
      } else { 
       Toast.makeText(this, "DDDDDDD",Toast.LENGTH_LONG).show(); 
      } 

     } catch (IllegalArgumentException e1) { 
      e1.printStackTrace(); 
     } catch (IOException e2) { 
      e2.printStackTrace(); 
     } 
     return result; 
    } 

如何,如果Web服务器已关闭,没有回答我能处理的响应?

+0

1分钟后您是否超时异常? – Adil 2013-04-21 17:05:14

+0

如果您的网络服务器没有关闭/不回复,请设置超时,之后您将收到超时异常。试一试,http://stackoverflow.com/questions/16098810/access-network-availability-state-android/16099100#16099100 – surender8388 2013-04-21 17:10:27

+0

你不应该使用AsyncTask来执行网络请求,因为当你的设备的方向改变活动被破坏,但也是与此活动的生命周期相关的AsyncTask。为了避免这种情况,应该使用服务模式。 – Pcriulan 2013-04-24 19:43:19

回答

3

您需要为客户端的连接设置超时。例如:

protected String doInBackground(String... params) { 
    HttpParams httpParameters = new BasicHttpParams(); 
    // set the connection timeout and socket timeout parameters (milliseconds) 
    HttpConnectionParams.setConnectionTimeout(httpParameters, 5000); 
    HttpConnectionParams.setSoTimeout(httpParameters, 5000); 

    HttpClient client = new DefaultHttpClient(httpParameters); 
    . . . // the rest of your code 
}