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.unix;
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 ***/
037public final class rdate
038{
039
040    public static final void timeTCP(String host) throws IOException
041    {
042        TimeTCPClient client = new TimeTCPClient();
043
044        // We want to timeout if a response takes longer than 60 seconds
045        client.setDefaultTimeout(60000);
046        client.connect(host);
047        System.out.println(client.getDate().toString());
048        client.disconnect();
049    }
050
051    public static final void timeUDP(String host) throws IOException
052    {
053        TimeUDPClient client = new TimeUDPClient();
054
055        // We want to timeout if a response takes longer than 60 seconds
056        client.setDefaultTimeout(60000);
057        client.open();
058        System.out.println(client.getDate(InetAddress.getByName(host)).toString());
059        client.close();
060    }
061
062
063    public static void main(String[] args)
064    {
065
066        if (args.length == 1)
067        {
068            try
069            {
070                timeTCP(args[0]);
071            }
072            catch (IOException e)
073            {
074                e.printStackTrace();
075                System.exit(1);
076            }
077        }
078        else if (args.length == 2 && args[0].equals("-udp"))
079        {
080            try
081            {
082                timeUDP(args[1]);
083            }
084            catch (IOException e)
085            {
086                e.printStackTrace();
087                System.exit(1);
088            }
089        }
090        else
091        {
092            System.err.println("Usage: rdate [-udp] <hostname>");
093            System.exit(1);
094        }
095
096    }
097
098}
099