检查服务器是否可用?

本文介绍了检查服务器是否可用?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我开发了一个连接到服务器的应用程序.因此，我想使用波纹管函数来检查服务器是否可用，但我不知道如何在 线程中使用它，以及每次需要检查服务器是否在活动中可用时如何调用它或片段:

I developing an application which connects to the server. Therefore i want use the bellow function to check if the server is available , But I don't know how I can use it in a thread and how call it each time when I need check if the server is available in activity or fragment :

static public boolean isURLReachable(Context context) { ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo netInfo = cm.getActiveNetworkInfo(); if (netInfo != null && netInfo.isConnected()) { try { URL url = new URL("192.168.1.13"); // Change to "google" for www test. HttpURLConnection urlc = (HttpURLConnection) url.openConnection(); urlc.setConnectTimeout(10 * 1000); // 10 s. urlc.connect(); if (urlc.getResponseCode() == 200) { // 200 = "OK" code (http connection is fine). Log.wtf("Connection", "Success !"); return true; } else { return false; } } catch (MalformedURLException e1) { return false; } catch (IOException e) { return false; } } return false; }

推荐答案

看看这段代码:

public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo netInfo = cm.getActiveNetworkInfo(); if (netInfo != null && netInfo.isConnected()) { MyTask task = new MyTask(); task.execute(); } } private class MyTask extends AsyncTask<Void, Void, Boolean> { @Override protected void onPreExecute() { } @Override protected Boolean doInBackground(Void... params) { try { URL url = new URL("192.168.1.13"); // Change to "google" for www test. HttpURLConnection urlc = (HttpURLConnection) url.openConnection(); urlc.setConnectTimeout(10 * 1000); // 10 s. urlc.connect(); if (urlc.getResponseCode() == 200) { // 200 = "OK" code (http connection is fine). Log.wtf("Connection", "Success !"); return true; } else { return false; } } catch (MalformedURLException e1) { return false; } catch (IOException e) { return false; } } @Override protected void onPostExecute(Boolean result) { boolean bResponse = result; if (bResponse==true) { Toast.makeText(MainActivity.this, "server is available", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(MainActivity.this, "server is not available", Toast.LENGTH_SHORT).show(); } } } }