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/ProtocolCommandListener.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;
import java.util.EventListener;

/**
 * There exists a large class of IETF protocols that work by sending an
 * ASCII text command and arguments to a server, and then receiving an
 * ASCII text reply.  For debugging and other purposes, it is extremely
 * useful to log or keep track of the contents of the protocol messages.
 * The ProtocolCommandListener interface coupled with the
 * {@link ProtocolCommandEvent} class facilitate this process.
 * <p>
 * To receive ProtocolCommandEvents, you merely implement the
 * ProtocolCommandListener interface and register the class as a listener
 * with a ProtocolCommandEvent source such as
 * {@link org.apache.commons.net.ftp.FTPClient}.
 *
 *
 * @see ProtocolCommandEvent
 * @see ProtocolCommandSupport
 */

public interface ProtocolCommandListener extends EventListener
{

    /**
     * This method is invoked by a ProtocolCommandEvent source after
     * sending a protocol command to a server.
     *
     * @param event The ProtocolCommandEvent fired.
     */
    void protocolCommandSent(ProtocolCommandEvent event);

    /**
     * This method is invoked by a ProtocolCommandEvent source after
     * receiving a reply from a server.
     *
     * @param event The ProtocolCommandEvent fired.
     */
    void protocolReplyReceived(ProtocolCommandEvent event);

}

⏎ org/apache/commons/net/ProtocolCommandListener.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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