pr c3 bcfen ob ip adresse erreichbar java

1import java.net.*;
2
3public class SimplePing
4{
5  public static void main( String[] args )
6  {
7    System.out.println( "\nUsage: java SimplePing host [port] \n" +
8                        " e.g.: java SimplePing www.torsten-horn.de \n" +
9                        "   or: java SimplePing 1.2.3.4 80 \n" );
10    try {
11      if( args.length <= 0 )
12        throw new Exception( "Parameter missing!" );
13      InetAddress host = InetAddress.getByName( args[0] );
14      int         port = ( args.length > 1 ) ? Integer.parseInt( args[1] ) : 80;
15      long        tm   = System.nanoTime();
16      Socket      so   = new Socket( host, port );
17      so.close();
18      tm = (System.nanoTime() - tm) / 1000000L;
19      System.out.println( "Connection ok (port " + port + ", time = " + tm + " ms). \n" +
20                          "Host Address = " + host.getHostAddress() + "\n" +
21                          "Host Name    = " + host.getHostName() );
22      System.exit( 0 );
23    } catch( Exception ex ) {
24      System.out.println( "Error: " + ex.getMessage() );
25      System.exit( 1 );
26    }
27  }
28}
29