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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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