如何检查服务器可用性的Android

我有以下代码来检查服务器的可用性，但它不工作我一直在使用连接管理器效果很好如何检查服务器可用性的Android

public static boolean isConnected(Context context, String url){ 
    ConnectivityManager connectivityManager=(ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE); 
    if(connectivityManager!=null){ 

     if ((connectivityManager.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED) 
        ||(connectivityManager.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTING) 
        ||(connectivityManager.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTING) 
        ||(connectivityManager.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED)) 
      { 


        try{ 
         URL myUrl = new URL(url); 
         URLConnection connection = myUrl.openConnection(); 
         connection.setConnectTimeout(5000); 
         connection.connect(); 
         return true; 
        } catch (Exception e) { 
         // Handle your exceptions 
         return false; 
        } 



      } 

    } 
    return false; 

}

来源

2014-02-11 HemangNirmal

您的**代码在哪里检查服务器可用性**？ –

内部尝试并捕获 – HemangNirmal

您可以通过提出请求来检查服务器的可用性。如果你在超时时间内得到响应（检查响应长度），那么你的服务器可用，如果没有，那么服务器失败。这就是 –

检查网络可用性，你可以这样做：

  HttpParams httpParams = new BasicHttpParams(); 
     //int some_reasonable_timeout = (int) (30 * DateUtils.SECOND_IN_MILLIS); 
     int some_reasonable_timeout = 10; 
     HttpConnectionParams.setConnectionTimeout(httpParams, some_reasonable_timeout); 
     HttpConnectionParams.setSoTimeout(httpParams, some_reasonable_timeout); 
     //DefaultHttpClient client = new DefaultHttpClient(); 

     // get the response 
     HttpResponse response = null; 
     try { 
      response = client.execute(request); 
     } catch (ClientProtocolException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

     StatusLine status = response.getStatusLine(); 
     Log.d("tag","status is"+status.toString()); 
      if (status.getStatusCode() == HttpStatus.SC_OK) 
      { 
      //cserver is available 
      } 
      else 
      { 
       //server is not available 
      }

来源

2014-02-11 06:06:53

有很多方法。但我选择这个way.You可以实现像下面：

HttpClient httpclient = new DefaultHttpClient(); 
    String response = null; 
    URI url; 
    try { 

     String s = "url"; 

     url = new URI(s.replace(" ", "%20")); 

     Log.e("my webservice", "My webservice : " + url); 

     HttpGet httpget = new HttpGet(url); 
     HttpResponse httpResponse = null; 

     HttpParams httpParameters = new BasicHttpParams(); 
     // Set the timeout in milliseconds until a connection is 
     // established. 
     // The default value is zero, that means the timeout is not used. 
     int timeoutConnection = 3000; 
     HttpConnectionParams.setConnectionTimeout(httpParameters, 
       timeoutConnection); 
     // Set the default socket timeout (SO_TIMEOUT) 
     // in milliseconds which is the timeout for waiting for data. 
     int timeoutSocket = 5000; 
     HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket); 


     DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters); 

     // Execute HTTP Post Request 
     httpResponse = httpClient.execute(httpget); 

     response = EntityUtils.toString(httpResponse.getEntity(), "UTF-8"); 
      Log.e("Login service", "resonse length : " + url); 


      if(response.length()>0){ 
       return true;//server available 
      }else{ 
       return false;//server not available 
      } 

      // this is what we extended for the getting the response string 
      // which we going to parese for out use in database // 


    } catch (Exception e1) { 
     // TODO Auto-generated catch block 
     e1.printStackTrace(); 
    } 
    return false;

来源

2014-02-11 06:12:14

感谢您的指导 – HemangNirmal

您可以简单地声明Socket。我在我的许多项目中使用了以下代码，并且超时确实可行。

Socket socket; 
final String host = "your.server.IP.or.host"; 
final int port = 80; 
final int timeout = 30000; // 30 seconds 

try { 
    socket = new Socket(); 
    socket.connect(new InetSocketAddress(host, port), timeout); 
} 
catch (UnknownHostException uhe) { 
    Log.e("ServerSock", "I couldn't resolve the host you've provided!"); 
} 
catch (SocketTimeoutException ste) { 
    Log.e("ServerSock", "After a reasonable amount of time, I'm not able to connect, Server is probably down!"); 
} 
catch (IOException ioe) { 
    Log.e("ServerSock", "Hmmm... Sudden disconnection, probably you should start again!"); 
}

虽然这可能会很棘手。正确地在UnknownHostException之间，超时可能需要更长的时间，大约45秒 - 但另一方面，当您无法解析主机时，通常会发生这种情况，因此这更像是意味着您的Internet访问配置了DNS配置错误（这是不太可能）。

无论如何，如果你想对冲你的赌注，你可以简单地使用你的IP地址，而不是主机。这样，如果有任何例外情况发生，您将确保这不是问题。

来源

2014-02-11 07:35:12 nKn

如何检查服务器可用性的Android

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