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1 package examples; 2 3 /* ==================================================================== 4 * The Apache Software License, Version 1.1 5 * 6 * Copyright (c) 2001 The Apache Software Foundation. All rights 7 * reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The end-user documentation included with the redistribution, 22 * if any, must include the following acknowledgment: 23 * "This product includes software developed by the 24 * Apache Software Foundation (http://www.apache.org/)." 25 * Alternately, this acknowledgment may appear in the software itself, 26 * if and wherever such third-party acknowledgments normally appear. 27 * 28 * 4. The names "Apache" and "Apache Software Foundation" and 29 * "Apache Commons" must not be used to endorse or promote products 30 * derived from this software without prior written permission. For 31 * written permission, please contact apache@apache.org. 32 * 33 * 5. Products derived from this software may not be called "Apache", 34 * nor may "Apache" appear in their name, without 35 * prior written permission of the Apache Software Foundation. 36 * 37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This software consists of voluntary contributions made by many 52 * individuals on behalf of the Apache Software Foundation. For more 53 * information on the Apache Software Foundation, please see 54 * <http://www.apache.org/>;. 55 */ 56 57 import java.io.IOException; 58 import java.net.InetAddress; 59 import org.apache.commons.net.TimeTCPClient; 60 import org.apache.commons.net.TimeUDPClient; 61 62 /**** 63 * This is an example program demonstrating how to use the TimeTCPClient 64 * and TimeUDPClient classes. It's very similar to the simple Unix rdate 65 * command. This program connects to the default time service port of a 66 * specified server, retrieves the time, and prints it to standard output. 67 * The default is to use the TCP port. Use the -udp flag to use the UDP 68 * port. You can test this program by using the NIST time server at 69 * 132.163.135.130 (warning: the IP address may change). 70 * <p> 71 * Usage: rdate [-udp] <hostname> 72 * <p> 73 * <p> 74 * @author Daniel F. Savarese 75 ***/ 76 public final class rdate 77 { 78 79 public static final void timeTCP(String host) throws IOException 80 { 81 TimeTCPClient client = new TimeTCPClient(); 82 83 // We want to timeout if a response takes longer than 60 seconds 84 client.setDefaultTimeout(60000); 85 client.connect(host); 86 System.out.println(client.getDate().toString()); 87 client.disconnect(); 88 } 89 90 public static final void timeUDP(String host) throws IOException 91 { 92 TimeUDPClient client = new TimeUDPClient(); 93 94 // We want to timeout if a response takes longer than 60 seconds 95 client.setDefaultTimeout(60000); 96 client.open(); 97 System.out.println(client.getDate(InetAddress.getByName(host)).toString()); 98 client.close(); 99 } 100 101 102 public static final void main(String[] args) 103 { 104 105 if (args.length == 1) 106 { 107 try 108 { 109 timeTCP(args[0]); 110 } 111 catch (IOException e) 112 { 113 e.printStackTrace(); 114 System.exit(1); 115 } 116 } 117 else if (args.length == 2 && args[0].equals("-udp")) 118 { 119 try 120 { 121 timeUDP(args[1]); 122 } 123 catch (IOException e) 124 { 125 e.printStackTrace(); 126 System.exit(1); 127 } 128 } 129 else 130 { 131 System.err.println("Usage: rdate [-udp] <hostname>"); 132 System.exit(1); 133 } 134 135 } 136 137 } 138

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