Checking if server is online from Java code

Question

I want to check if server application is available. After server is started I want to stop checking until the server changes status. How to do that with my code:

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Answer 1

First check if server is running and the server accepts the connection.

   public static boolean hostAvailabilityCheck()
{ 
    s = new Socket(SERVER_ADDRESS, TCP_SERVER_PORT);
    boolean available = true; 
    try {               
        if (s.isConnected())
        { s.close();    
        }               
        } 
    catch (UnknownHostException e) 
        { // unknown host 
        available = false;
        s = null;
        } 
    catch (IOException e) { // io exception, service probably not running 
        available = false;
        s = null;
        } 
    catch (NullPointerException e) {
        available = false;
        s=null;
    }


    return available;   
}