001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package examples;
019
020import java.io.IOException;
021import java.net.InetAddress;
022
023import org.apache.commons.net.time.TimeTCPClient;
024import org.apache.commons.net.time.TimeUDPClient;
025
026/***
027 * This is an example program demonstrating how to use the TimeTCPClient
028 * and TimeUDPClient classes.  It's very similar to the simple Unix rdate
029 * command.  This program connects to the default time service port of a
030 * specified server, retrieves the time, and prints it to standard output.
031 * The default is to use the TCP port.  Use the -udp flag to use the UDP
032 * port.  You can test this program by using the NIST time server at
033 * 132.163.135.130 (warning: the IP address may change).
034 * <p>
035 * Usage: rdate [-udp] <hostname>
036 * <p>
037 * <p>
038 * @author Daniel F. Savarese
039 ***/
040public final class rdate
041{
042
043    public static final void timeTCP(String host) throws IOException
044    {
045        TimeTCPClient client = new TimeTCPClient();
046
047        // We want to timeout if a response takes longer than 60 seconds
048        client.setDefaultTimeout(60000);
049        client.connect(host);
050        System.out.println(client.getDate().toString());
051        client.disconnect();
052    }
053
054    public static final void timeUDP(String host) throws IOException
055    {
056        TimeUDPClient client = new TimeUDPClient();
057
058        // We want to timeout if a response takes longer than 60 seconds
059        client.setDefaultTimeout(60000);
060        client.open();
061        System.out.println(client.getDate(InetAddress.getByName(host)).toString());
062        client.close();
063    }
064
065
066    public static final void main(String[] args)
067    {
068
069        if (args.length == 1)
070        {
071            try
072            {
073                timeTCP(args[0]);
074            }
075            catch (IOException e)
076            {
077                e.printStackTrace();
078                System.exit(1);
079            }
080        }
081        else if (args.length == 2 && args[0].equals("-udp"))
082        {
083            try
084            {
085                timeUDP(args[1]);
086            }
087            catch (IOException e)
088            {
089                e.printStackTrace();
090                System.exit(1);
091            }
092        }
093        else
094        {
095            System.err.println("Usage: rdate [-udp] <hostname>");
096            System.exit(1);
097        }
098
099    }
100
101}
102