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/io/SocketOutputStream.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.io;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;

/**
 * This class wraps an output stream, storing a reference to its originating
 * socket.  When the stream is closed, it will also close the socket
 * immediately afterward.  This class is useful for situations where you
 * are dealing with a stream originating from a socket, but do not have
 * a reference to the socket, and want to make sure it closes when the
 * stream closes.
 *
 *
 * @see SocketInputStream
 */

public class SocketOutputStream extends FilterOutputStream
{
    private final Socket socket;

    /**
     * Creates a SocketOutputStream instance wrapping an output stream and
     * storing a reference to a socket that should be closed on closing
     * the stream.
     *
     * @param socket  The socket to close on closing the stream.
     * @param stream  The input stream to wrap.
     */
    public SocketOutputStream(final Socket socket, final OutputStream stream)
    {
        super(stream);
        this.socket = socket;
    }


    /**
     * Writes a number of bytes from a byte array to the stream starting from
     * a given offset.  This method bypasses the equivalent method in
     * FilterOutputStream because the FilterOutputStream implementation is
     * very inefficient.
     *
     * @param buffer  The byte array to write.
     * @param offset  The offset into the array at which to start copying data.
     * @param length  The number of bytes to write.
     * @throws IOException If an error occurs while writing to the underlying
     *            stream.
     */
    @Override
    public void write(final byte buffer[], final int offset, final int length) throws IOException
    {
        out.write(buffer, offset, length);
    }


    /**
     * Closes the stream and immediately afterward closes the referenced
     * socket.
     *
     * @throws IOException  If there is an error in closing the stream
     *                         or socket.
     */
    @Override
    public void close() throws IOException
    {
        super.close();
        socket.close();
    }
}

⏎ org/apache/commons/net/io/SocketOutputStream.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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