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| org.apache.commons.net.DaytimeUDPClient |
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| 1 | /* |
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| 2 | * Copyright 2001-2005 The Apache Software Foundation |
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| 3 | * |
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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| 5 | * you may not use this file except in compliance with the License. |
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| 6 | * You may obtain a copy of the License at |
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| 7 | * |
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 9 | * |
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| 10 | * Unless required by applicable law or agreed to in writing, software |
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 13 | * See the License for the specific language governing permissions and |
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| 14 | * limitations under the License. |
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| 15 | */ |
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| 16 | package org.apache.commons.net; |
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| 17 | ||
| 18 | import java.io.IOException; |
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| 19 | import java.net.DatagramPacket; |
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| 20 | import java.net.InetAddress; |
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| 21 | ||
| 22 | /*** |
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| 23 | * The DaytimeUDPClient class is a UDP implementation of a client for the |
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| 24 | * Daytime protocol described in RFC 867. To use the class, merely |
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| 25 | * open a local datagram socket with |
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| 26 | * {@link org.apache.commons.net.DatagramSocketClient#open open } |
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| 27 | * and call {@link #getTime getTime } to retrieve the daytime |
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| 28 | * string, then |
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| 29 | * call {@link org.apache.commons.net.DatagramSocketClient#close close } |
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| 30 | * to close the connection properly. Unlike |
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| 31 | * {@link org.apache.commons.net.DaytimeTCPClient}, |
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| 32 | * successive calls to {@link #getTime getTime } are permitted |
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| 33 | * without re-establishing a connection. That is because UDP is a |
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| 34 | * connectionless protocol and the Daytime protocol is stateless. |
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| 35 | * <p> |
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| 36 | * <p> |
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| 37 | * @author Daniel F. Savarese |
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| 38 | * @see DaytimeTCPClient |
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| 39 | ***/ |
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| 40 | ||
| 41 | 0 | public final class DaytimeUDPClient extends DatagramSocketClient |
| 42 | { |
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| 43 | /*** The default daytime port. It is set to 13 according to RFC 867. ***/ |
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| 44 | public static final int DEFAULT_PORT = 13; |
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| 45 | ||
| 46 | 0 | private byte[] __dummyData = new byte[1]; |
| 47 | // Received dates should be less than 256 bytes |
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| 48 | 0 | private byte[] __timeData = new byte[256]; |
| 49 | ||
| 50 | /*** |
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| 51 | * Retrieves the time string from the specified server and port and |
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| 52 | * returns it. |
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| 53 | * <p> |
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| 54 | * @param host The address of the server. |
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| 55 | * @param port The port of the service. |
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| 56 | * @return The time string. |
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| 57 | * @exception IOException If an error occurs while retrieving the time. |
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| 58 | ***/ |
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| 59 | public String getTime(InetAddress host, int port) throws IOException |
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| 60 | { |
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| 61 | DatagramPacket sendPacket, receivePacket; |
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| 62 | ||
| 63 | 0 | sendPacket = |
| 64 | new DatagramPacket(__dummyData, __dummyData.length, host, port); |
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| 65 | 0 | receivePacket = new DatagramPacket(__timeData, __timeData.length); |
| 66 | ||
| 67 | 0 | _socket_.send(sendPacket); |
| 68 | 0 | _socket_.receive(receivePacket); |
| 69 | ||
| 70 | 0 | return new String(receivePacket.getData(), 0, receivePacket.getLength()); |
| 71 | } |
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| 72 | ||
| 73 | /*** Same as <code>getTime(host, DaytimeUDPClient.DEFAULT_PORT);</code> ***/ |
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| 74 | public String getTime(InetAddress host) throws IOException |
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| 75 | { |
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| 76 | 0 | return getTime(host, DEFAULT_PORT); |
| 77 | } |
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| 78 | ||
| 79 | } |
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| 80 |
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