commons-net.jar is the bytecode of Apache Commons Net library, which implements the client side of many basic Internet protocols.

Apache Commons Net Source Code files are provided in the binary packge (commons-net-3.8.0-bin.zip). You can download it at Apache Commons Net Website.

The source code of commons-net-3.8.0.jar is provided below:

⏎ org/apache/commons/net/discard/DiscardUDPClient.java

/*
 * 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
 *
 *      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.discard;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;

import org.apache.commons.net.DatagramSocketClient;
import org.apache.commons.net.util.NetConstants;

/**
 * The DiscardUDPClient class is a UDP implementation of a client for the
 * Discard protocol described in RFC 863.  To use the class,
 * just open a local UDP port
 * with {@link org.apache.commons.net.DatagramSocketClient#open  open }
 * and call {@link #send  send } to send datagrams to the server
 * After you're done sending discard data, call
 * {@link org.apache.commons.net.DatagramSocketClient#close  close() }
 * to clean up properly.
 *
 * @see DiscardTCPClient
 */

public class DiscardUDPClient extends DatagramSocketClient
{
    /** The default discard port.  It is set to 9 according to RFC 863. */
    public static final int DEFAULT_PORT = 9;

    private final DatagramPacket sendPacket;

    public DiscardUDPClient()
    {
        sendPacket = new DatagramPacket(NetConstants.EMPTY_BTYE_ARRAY, 0);
    }


    /**
     * Sends the specified data to the specified server at the specified port.
     *
     * @param data  The discard data to send.
     * @param length  The length of the data to send.  Should be less than
     *    or equal to the length of the data byte array.
     * @param host  The address of the server.
     * @param port  The service port.
     * @throws IOException If an error occurs during the datagram send
     *            operation.
     */
    public void send(final byte[] data, final int length, final InetAddress host, final int port)
    throws IOException
    {
        sendPacket.setData(data);
        sendPacket.setLength(length);
        sendPacket.setAddress(host);
        sendPacket.setPort(port);
        _socket_.send(sendPacket);
    }


    /**
     * Same as
     * <code>send(data, length, host. DiscardUDPClient.DEFAULT_PORT)</code>.
     * @param data the buffer to send
     * @param length the length of the data in the buffer
     * @param host the target host
     * @see #send(byte[], int, InetAddress, int)
     * @throws IOException if an error occurs
     */
    public void send(final byte[] data, final int length, final InetAddress host)
    throws IOException
    {
        send(data, length, host, DEFAULT_PORT);
    }


    /**
     * Same as
     * <code>send(data, data.length, host. DiscardUDPClient.DEFAULT_PORT)</code>.
     * @param data the buffer to send
     * @param host the target host
     * @see #send(byte[], int, InetAddress, int)
     * @throws IOException if an error occurs
     */
    public void send(final byte[] data, final InetAddress host) throws IOException
    {
        send(data, data.length, host, DEFAULT_PORT);
    }

}

⏎ org/apache/commons/net/discard/DiscardUDPClient.java

Or download all of them as a single archive file:

File name: commons-net-3.8.0-sources.jar
File size: 437325 bytes
Release date: 2020-01-22
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