001package examples.ntp;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one or more
005 * contributor license agreements.  See the NOTICE file distributed with
006 * this work for additional information regarding copyright ownership.
007 * The ASF licenses this file to You under the Apache License, Version 2.0
008 * (the "License"); you may not use this file except in compliance with
009 * the License.  You may obtain a copy of the License at
010 *
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019
020 
021import java.io.IOException;
022import java.net.InetAddress;
023
024import org.apache.commons.net.time.TimeTCPClient;
025import org.apache.commons.net.time.TimeUDPClient;
026
027/***
028 * This is an example program demonstrating how to use the TimeTCPClient
029 * and TimeUDPClient classes.
030 * This program connects to the default time service port of a
031 * specified server, retrieves the time, and prints it to standard output.
032 * See <A HREF="ftp://ftp.rfc-editor.org/in-notes/rfc868.txt"> the spec </A>
033 * for details.  The default is to use the TCP port.  Use the -udp flag to
034 * use the UDP port.
035 * <p>
036 * Usage: TimeClient [-udp] <hostname>
037 * <p>
038 ***/
039public final class TimeClient
040{
041
042    public static final void timeTCP(String host) throws IOException
043    {
044        TimeTCPClient client = new TimeTCPClient();
045    try {
046          // We want to timeout if a response takes longer than 60 seconds
047          client.setDefaultTimeout(60000);
048      client.connect(host);
049          System.out.println(client.getDate());
050    } finally {
051          client.disconnect();
052    }
053    }
054
055    public static final void timeUDP(String host) throws IOException
056    {
057        TimeUDPClient client = new TimeUDPClient();
058
059        // We want to timeout if a response takes longer than 60 seconds
060        client.setDefaultTimeout(60000);
061        client.open();
062        System.out.println(client.getDate(InetAddress.getByName(host)));
063        client.close();
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: TimeClient [-udp] <hostname>");
096            System.exit(1);
097        }
098
099    }
100
101}
102