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What this is

This file is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

/*
 * Copyright 2001-2004 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.net;
import java.io.IOException;
import java.util.Date;
import java.io.DataInputStream;

/***
 * The TimeTCPClient class is a TCP implementation of a client for the
 * Time protocol described in RFC 868.  To use the class, merely
 * establish a connection with
 *  connect 
 * and call either  getTime()  or
 *  getDate()  to retrieve the time, then
 * call  disconnect 
 * to close the connection properly.
 * 

*

* @author Daniel F. Savarese * @see TimeUDPClient ***/ public final class TimeTCPClient extends SocketClient { /*** The default time port. It is set to 37 according to RFC 868. ***/ public static final int DEFAULT_PORT = 37; /*** * The number of seconds between 00:00 1 January 1900 and * 00:00 1 January 1970. This value can be useful for converting * time values to other formats. ***/ public static final long SECONDS_1900_TO_1970 = 2208988800L; /*** * The default TimeTCPClient constructor. It merely sets the default * port to DEFAULT_PORT . ***/ public TimeTCPClient () { setDefaultPort(DEFAULT_PORT); } /*** * Retrieves the time from the server and returns it. The time * is the number of seconds since 00:00 (midnight) 1 January 1900 GMT, * as specified by RFC 868. This method reads the raw 32-bit big-endian * unsigned integer from the server, converts it to a Java long, and * returns the value. *

* The server will have closed the connection at this point, so you should * call * disconnect * after calling this method. To retrieve another time, you must * initiate another connection with * connect * before calling getTime() again. *

* @return The time value retrieved from the server. * @exception IOException If an error occurs while fetching the time. ***/ public long getTime() throws IOException { DataInputStream input; input = new DataInputStream(_input_); return (long)(input.readInt() & 0xffffffffL); } /*** * Retrieves the time from the server and returns a Java Date * containing the time converted to the local timezone. *

* The server will have closed the connection at this point, so you should * call * disconnect * after calling this method. To retrieve another time, you must * initiate another connection with * connect * before calling getDate() again. *

* @return A Date value containing the time retrieved from the server * converted to the local timezone. * @exception IOException If an error occurs while fetching the time. ***/ public Date getDate() throws IOException { return new Date((getTime() - SECONDS_1900_TO_1970)*1000L); } }

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