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/DiscardTCPClient.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.OutputStream;

import org.apache.commons.net.SocketClient;

/**
 * The DiscardTCPClient class is a TCP implementation of a client for the
 * Discard protocol described in RFC 863.  To use the class, merely
 * establish a connection with
 * {@link org.apache.commons.net.SocketClient#connect  connect }
 * and call {@link #getOutputStream  getOutputStream() } to
 * retrieve the discard output stream.  Don't close the output stream
 * when you're done writing to it.  Rather, call
 * {@link org.apache.commons.net.SocketClient#disconnect  disconnect }
 * to clean up properly.
 *
 * @see DiscardUDPClient
 */

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

    /**
     * The default DiscardTCPClient constructor.  It merely sets the default
     * port to <code> DEFAULT_PORT </code>.
     */
    public DiscardTCPClient ()
    {
        setDefaultPort(DEFAULT_PORT);
    }

    /**
     * Returns an OutputStream through which you may write data to the server.
     * You should NOT close the OutputStream when you're finished
     * reading from it.  Rather, you should call
     * {@link org.apache.commons.net.SocketClient#disconnect  disconnect }
     * to clean up properly.
     *
     * @return An OutputStream through which you can write data to the server.
     */
    public OutputStream getOutputStream()
    {
        return _output_;
    }
}

⏎ org/apache/commons/net/discard/DiscardTCPClient.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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