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Commons Net example source code file (

This example Commons Net source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Net tags/keywords

datagrampacket, datagrampacket, datagramsocketclient, daytimeudpclient, default_port, default_port, io, ioexception, ioexception, net, network, string, string

The Commons Net source code

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.




 * The DaytimeUDPClient class is a UDP implementation of a client for the
 * Daytime protocol described in RFC 867.  To use the class, merely
 * open a local datagram socket with
 * {@link  open }
 * and call {@link #getTime  getTime } to retrieve the daytime
 * string, then
 * call {@link  close }
 * to close the connection properly.  Unlike
 * {@link},
 * successive calls to {@link #getTime  getTime } are permitted
 * without re-establishing a connection.  That is because UDP is a
 * connectionless protocol and the Daytime protocol is stateless.
 * <p>
 * <p>
 * @see DaytimeTCPClient

public final class DaytimeUDPClient extends DatagramSocketClient
    /*** The default daytime port.  It is set to 13 according to RFC 867. ***/
    public static final int DEFAULT_PORT = 13;

    private final byte[] __dummyData = new byte[1];
    // Received dates should be less than 256 bytes
    private final byte[] __timeData = new byte[256];

     * Retrieves the time string from the specified server and port and
     * returns it.
     * <p>
     * @param host The address of the server.
     * @param port The port of the service.
     * @return The time string.
     * @exception IOException If an error occurs while retrieving the time.
    public String getTime(InetAddress host, int port) throws IOException
        DatagramPacket sendPacket, receivePacket;

        sendPacket =
            new DatagramPacket(__dummyData, __dummyData.length, host, port);
        receivePacket = new DatagramPacket(__timeData, __timeData.length);


        return new String(receivePacket.getData(), 0, receivePacket.getLength());

    /*** Same as <code>getTime(host, DaytimeUDPClient.DEFAULT_PORT); ***/
    public String getTime(InetAddress host) throws IOException
        return getTime(host, DEFAULT_PORT);


Other Commons Net examples (source code examples)

Here is a short list of links related to this Commons Net source code file:

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