commons-net-3.6.jar - Apache Commons Net

commons-net-3.6.jar is the JAR file for Apache Commons Net 3.6, which implements the client side of many basic Internet protocols.

commons-net-3.6.jar is distributed as part of the download file.

JAR File Size and Download Location:

JAR name: commons-net.jar, commons-net-3.6.jar
Target JDK version: 1.6
Dependency: None
File name: commons-net-3.6.jar
File size: 307410 bytes
Release date: 2017-02-11
Download: Apache Commons Net

✍: FYIcenter


 * 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.
 * @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.
     * @param host The address of the server.
     * @param port The port of the service.
     * @return The time string.
     * @throws 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(), getCharsetName()); // Java 1.6 can use getCharset()

    /** Same as <code>getTime(host, DaytimeUDPClient.DEFAULT_PORT);</code>
     * @param host the host
     * @return  the time
     * @throws IOException on error
    public String getTime(InetAddress host) throws IOException
        return getTime(host, DEFAULT_PORT);




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