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This is a simple client for the Daytime protocol.
It is also a simple demonstration of doing UDP socket
communication in Java.
Here is the Source Code.
©2000, Sean Graham.
License Information
import java.net.*;
import java.io .*;
import java.util.*;
/**
* The Daytime application connects to a UDP Daytime daemon as a client.
*
* @version 1.0
* @author Sean M. Graham <grahams {of} csh [dot] rit [dot] educational>
*
*/
public class Daytime {
/**
* This is a simple app, so it only really requires a main().
*
* @param args The command line arguments
*/
public static void main(String args[]) {
if( args.length > 1) {
System.out.println("Daytime: Too Many Arguments" );
System.exit(-1);
}
try {
DatagramSocket sock = new DatagramSocket();
DatagramPacket pak;
byte msg[] = new byte[64];
InetAddress daytimeHost = InetAddress.getByName( args[0] );
// create a datagram packet to send and recieve the reply. the
// contents on send don't really matter for this application
pak = new DatagramPacket( msg, 64, daytimeHost, 13 );
// Send and receive, and time out after 30 seconds.
sock.send(pak);
sock.setSoTimeout(30000);
sock.receive(pak);
String received = new String( pak.getData() );
received = received.trim();
System.out.println( "Time: " + received );
// Close our socket
sock.close();
}
catch( UnknownHostException e) {
System.out.println( "Daytime: Invalid Machine Name (" +
args[0] + ")" );
}
catch (InterruptedIOException e) {
System.out.println("Daytime: Timeout");
}
catch (Exception e) {}
}
}
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