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 ***/ 038public final class TimeClient 039{ 040 041 public static final void timeTCP(String host) throws IOException 042 { 043 TimeTCPClient client = new TimeTCPClient(); 044 try { 045 // We want to timeout if a response takes longer than 60 seconds 046 client.setDefaultTimeout(60000); 047 client.connect(host); 048 System.out.println(client.getDate()); 049 } finally { 050 client.disconnect(); 051 } 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))); 062 client.close(); 063 } 064 065 public static void main(String[] args) 066 { 067 068 if (args.length == 1) 069 { 070 try 071 { 072 timeTCP(args[0]); 073 } 074 catch (IOException e) 075 { 076 e.printStackTrace(); 077 System.exit(1); 078 } 079 } 080 else if (args.length == 2 && args[0].equals("-udp")) 081 { 082 try 083 { 084 timeUDP(args[1]); 085 } 086 catch (IOException e) 087 { 088 e.printStackTrace(); 089 System.exit(1); 090 } 091 } 092 else 093 { 094 System.err.println("Usage: TimeClient [-udp] <hostname>"); 095 System.exit(1); 096 } 097 098 } 099 100} 101