How can I figure out network connection is available in java?

Question

How can I figure out network connection is available in java? I want to get information about network connection. If it is available, I'll connect to network for fetching data otherwise I use local database.

Is There any solution?

Answer 1

Such as @igor said: "Try to connect the network, as you said. If fails, repeat e.g. 3 times. If still failling, use local database. You don't have to additionally ping anything."

For Example:

    public class InternetConnection {
    /*  use at least one reliable host, in most cases you will want
        to use the one you're working with later    */
    private static final String CHECK_URL = "http://www.t-online.de/";
    public static InternetConnectionState isAvailable() {
        try {
            URL url = new URL(InternetConnection.CHECK_URL);
            HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
            Object objData = urlConnection.getContent();
        } catch(UnknownHostException exception) {
            return new InternetConnectionState(false);
        } catch(IOException exception) {
            return new InternetConnectionState(false);
        }
        return new InternetConnectionState(true);
    }
}

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