Use the TimeTCPClient and TimeUDPClient: simple Unix rdate
/*
* Copyright 2001-2005 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package examples;
import java.io.IOException;
import java.net.InetAddress;
import org.apache.commons.net.TimeTCPClient;
import org.apache.commons.net.TimeUDPClient;
/***
* This is an example program demonstrating how to use the TimeTCPClient
* and TimeUDPClient classes. It's very similar to the simple Unix rdate
* command. This program connects to the default time service port of a
* specified server, retrieves the time, and prints it to standard output.
* The default is to use the TCP port. Use the -udp flag to use the UDP
* port. You can test this program by using the NIST time server at
* 132.163.135.130 (warning: the IP address may change).
* <p>
* Usage: rdate [-udp] <hostname>
* <p>
* <p>
* @author Daniel F. Savarese
***/
public class rdate
{
public static final void timeTCP(String host) throws IOException
{
TimeTCPClient client = new TimeTCPClient();
// We want to timeout if a response takes longer than 60 seconds
client.setDefaultTimeout(60000);
client.connect(host);
System.out.println(client.getDate().toString());
client.disconnect();
}
public static final void timeUDP(String host) throws IOException
{
TimeUDPClient client = new TimeUDPClient();
// We want to timeout if a response takes longer than 60 seconds
client.setDefaultTimeout(60000);
client.open();
System.out.println(client.getDate(InetAddress.getByName(host)).toString());
client.close();
}
public static final void main(String[] args)
{
if (args.length == 1)
{
try
{
timeTCP(args[0]);
}
catch (IOException e)
{
e.printStackTrace();
System.exit(1);
}
}
else if (args.length == 2 && args[0].equals("-udp"))
{
try
{
timeUDP(args[1]);
}
catch (IOException e)
{
e.printStackTrace();
System.exit(1);
}
}
else
{
System.err.println("Usage: rdate [-udp] <hostname>");
System.exit(1);
}
}
}
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