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    
018    package examples;
019    
020    import java.io.IOException;
021    import java.net.InetAddress;
022    
023    import org.apache.commons.net.time.TimeTCPClient;
024    import 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     ***/
040    public 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