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1 package org.apache.commons.net; 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.BufferedReader; 58 import java.io.IOException; 59 import java.io.InputStreamReader; 60 61 /**** 62 * The DaytimeTCPClient class is a TCP implementation of a client for the 63 * Daytime protocol described in RFC 867. To use the class, merely 64 * establish a connection with 65 * <a href="org.apache.commons.net.SocketClient.html#connect"> connect </a> 66 * and call <a href="#getTime"> getTime() </a> to retrieve the daytime 67 * string, then 68 * call <a href="org.apache.commons.net.SocketClient.html#disconnect"> disconnect </a> 69 * to close the connection properly. 70 * <p> 71 * <p> 72 * @author Daniel F. Savarese 73 * @see DaytimeUDPClient 74 ***/ 75 76 public final class DaytimeTCPClient extends SocketClient 77 { 78 /**** The default daytime port. It is set to 13 according to RFC 867. ***/ 79 public static final int DEFAULT_PORT = 13; 80 81 // Received dates will likely be less than 64 characters. 82 // This is a temporary buffer used while receiving data. 83 private char[] __buffer = new char[64]; 84 85 /**** 86 * The default DaytimeTCPClient constructor. It merely sets the default 87 * port to <code> DEFAULT_PORT </code>. 88 ***/ 89 public DaytimeTCPClient () 90 { 91 setDefaultPort(DEFAULT_PORT); 92 } 93 94 /**** 95 * Retrieves the time string from the server and returns it. The 96 * server will have closed the connection at this point, so you should 97 * call 98 * <a href="org.apache.commons.net.SocketClient.html#disconnect"> disconnect </a> 99 * after calling this method. To retrieve another time, you must 100 * initiate another connection with 101 * <a href="org.apache.commons.net.SocketClient.html#connect"> connect </a> 102 * before calling <code> getTime() </code> again. 103 * <p> 104 * @return The time string retrieved from the server. 105 * @exception IOException If an error occurs while fetching the time string. 106 ***/ 107 public String getTime() throws IOException 108 { 109 int read; 110 StringBuffer result = new StringBuffer(__buffer.length); 111 BufferedReader reader; 112 113 reader = new BufferedReader(new InputStreamReader(_input_)); 114 115 while (true) 116 { 117 read = reader.read(__buffer, 0, __buffer.length); 118 if (read <= 0) 119 break; 120 result.append(__buffer, 0, read); 121 } 122 123 return result.toString(); 124 } 125 126 } 127

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