Groups > comp.lang.java.programmer > #9174

Re: Ping from JAVA to IP Address

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Subject	Re: Ping from JAVA to IP Address
Date	Tue, 25 Oct 2011 08:12:30 -0700
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On 10/25/2011 1:56 AM, sahm wrote:
> All I want to do is simple function that can check if there is
> Internet connection or Not ?


Doesn't work for me either, and I'm not sure why.  Try opening an HTTP 
socket on a well known address.  Can anybody supply a public host name 
that doesn't talk on port 80 so I can test this works ok when there's no 
internet connection?

public class PingTest {

    private static String pingVectors[] =
    { "cnn.com", "google.com", };

    public static void main(String[] args)
            throws UnknownHostException, IOException
    {
       for( String s : pingVectors ) {
          InetAddress ia = InetAddress.getByName(s);
          boolean reachable = ia.isReachable(6000);
          System.out.println(s+" is reachable: " + reachable);

          Socket sock = new Socket( s , 80 );
          sock.getOutputStream();
          sock.close();
          System.out.println(s+" opened socket ok");
       }
    }
}

Thread

Ping from JAVA to IP Address sahm <sahm007@gmail.com> - 2011-10-24 11:01 -0700
  Re: Ping from JAVA to IP Address Robert Klemme <shortcutter@googlemail.com> - 2011-10-24 20:26 +0200
    Re: Ping from JAVA to IP Address markspace <-@.> - 2011-10-24 14:52 -0700
      Re: Ping from JAVA to IP Address sahm <sahm007@gmail.com> - 2011-10-24 22:31 -0700
        Re: Ping from JAVA to IP Address sahm <sahm007@gmail.com> - 2011-10-25 01:56 -0700
          Re: Ping from JAVA to IP Address Screamin Lord Byron <scre@min.dot> - 2011-10-25 11:57 +0200
          Re: Ping from JAVA to IP Address markspace <-@.> - 2011-10-25 08:12 -0700
            Re: Ping from JAVA to IP Address Screamin Lord Byron <scre@min.dot> - 2011-10-25 22:13 +0200
              Re: Ping from JAVA to IP Address markspace <-@.> - 2011-10-25 16:02 -0700
                Re: Ping from JAVA to IP Address Screamin Lord Byron <scre@min.dot> - 2011-10-26 13:16 +0200
              Re: Ping from JAVA to IP Address Arne Vajhøj <arne@vajhoej.dk> - 2011-11-06 15:29 -0500
                Re: Ping from JAVA to IP Address glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2011-12-07 08:59 +0000
  Re: Ping from JAVA to IP Address Roedy Green <see_website@mindprod.com.invalid> - 2011-10-25 21:28 -0700
  Re: Ping from JAVA to IP Address Arne Vajhøj <arne@vajhoej.dk> - 2011-11-06 15:36 -0500

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