Commons Net example source code file (rdate.java)

This example Commons Net source code file (rdate.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons Net tags/keywords

io, ioexception, ioexception, net, network, timetcpclient, timetcpclient, timeudpclient, timeudpclient

The Commons Net rdate.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.unix;

import java.io.IOException;
import java.net.InetAddress;

import org.apache.commons.net.time.TimeTCPClient;
import org.apache.commons.net.time.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>
 ***/
public final 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);
        }

    }

}