001    /*
002     * Copyright 2001-2005 The Apache Software Foundation
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     *     http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package examples;
017    
018    import java.io.IOException;
019    import java.net.InetAddress;
020    import org.apache.commons.net.DaytimeTCPClient;
021    import org.apache.commons.net.DaytimeUDPClient;
022    
023    /***
024     * This is an example program demonstrating how to use the DaytimeTCP
025     * and DaytimeUDP classes.
026     * This program connects to the default daytime service port of a
027     * specified server, retrieves the daytime, and prints it to standard output.
028     * The default is to use the TCP port.  Use the -udp flag to use the UDP
029     * port.
030     * <p>
031     * Usage: daytime [-udp] <hostname>
032     * <p>
033     ***/
034    public final class daytime
035    {
036    
037        public static final void daytimeTCP(String host) throws IOException
038        {
039            DaytimeTCPClient client = new DaytimeTCPClient();
040    
041            // We want to timeout if a response takes longer than 60 seconds
042            client.setDefaultTimeout(60000);
043            client.connect(host);
044            System.out.println(client.getTime().trim());
045            client.disconnect();
046        }
047    
048        public static final void daytimeUDP(String host) throws IOException
049        {
050            DaytimeUDPClient client = new DaytimeUDPClient();
051    
052            // We want to timeout if a response takes longer than 60 seconds
053            client.setDefaultTimeout(60000);
054            client.open();
055            System.out.println(client.getTime(
056                                              InetAddress.getByName(host)).trim());
057            client.close();
058        }
059    
060    
061        public static final void main(String[] args)
062        {
063    
064            if (args.length == 1)
065            {
066                try
067                {
068                    daytimeTCP(args[0]);
069                }
070                catch (IOException e)
071                {
072                    e.printStackTrace();
073                    System.exit(1);
074                }
075            }
076            else if (args.length == 2 && args[0].equals("-udp"))
077            {
078                try
079                {
080                    daytimeUDP(args[1]);
081                }
082                catch (IOException e)
083                {
084                    e.printStackTrace();
085                    System.exit(1);
086                }
087            }
088            else
089            {
090                System.err.println("Usage: daytime [-udp] <hostname>");
091                System.exit(1);
092            }
093    
094        }
095    
096    }
097