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/echo/EchoTCPClient.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.echo;

import java.io.InputStream;

import org.apache.commons.net.discard.DiscardTCPClient;

/**
 * The EchoTCPClient class is a TCP implementation of a client for the
 * Echo protocol described in RFC 862.  To use the class, merely
 * establish a connection with
 * {@link org.apache.commons.net.SocketClient#connect  connect }
 * and call {@link DiscardTCPClient#getOutputStream  getOutputStream() } to
 * retrieve the echo output stream and
 * {@link #getInputStream getInputStream() }
 *  to get the echo input stream.
 * Don't close either stream when you're done using them.  Rather, call
 * {@link org.apache.commons.net.SocketClient#disconnect  disconnect }
 * to clean up properly.
 *
 * @see EchoUDPClient
 * @see DiscardTCPClient
 */

public final class EchoTCPClient extends DiscardTCPClient
{
    /** The default echo port.  It is set to 7 according to RFC 862. */
    public static final int DEFAULT_PORT = 7;

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

    /**
     * Returns an InputStream from which you may read echoed data from
     * the server.  You should NOT close the InputStream 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 InputStream from which you can read echoed data from the
     *         server.
     */
    public InputStream getInputStream()
    {
        return _input_;
    }

}

⏎ org/apache/commons/net/echo/EchoTCPClient.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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