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/pop3/POP3Command.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.pop3;

/**
 * POP3Command stores POP3 command code constants.
 *
 *
 */

public final class POP3Command
{
    /** Send user name. */
    public static final int USER = 0;
    /** Send password. */
    public static final int PASS = 1;
    /** Quit session. */
    public static final int QUIT = 2;
    /** Get status. */
    public static final int STAT = 3;
    /** List message(s). */
    public static final int LIST = 4;
    /** Retrieve message(s). */
    public static final int RETR = 5;
    /** Delete message(s). */
    public static final int DELE = 6;
    /** No operation.  Used as a session keepalive. */
    public static final int NOOP = 7;
    /** Reset session. */
    public static final int RSET = 8;
    /** Authorization. */
    public static final int APOP = 9;
    /** Retrieve top number lines from message. */
    public static final int TOP = 10;
    /** List unique message identifier(s). */
    public static final int UIDL = 11;
    /**
     * The capabilities command.
     * @since 3.0
     */
    public static final int CAPA = 12;
    /**
     * Authentication
     * @since 3.0
     */
    public static final int AUTH = 13;

    private static final int NEXT = AUTH + 1; // update as necessary when adding new entries

    static final String[] commands = {
                                          "USER", "PASS", "QUIT", "STAT", "LIST", "RETR", "DELE", "NOOP", "RSET",
                                          "APOP", "TOP", "UIDL", "CAPA", "AUTH",
                                      };

    static {
        if (commands.length != NEXT) {
            throw new RuntimeException("Error in array definition");
        }
    }

    // Cannot be instantiated.
    private POP3Command()
    {}

    /**
     * Get the POP3 protocol string command corresponding to a command code.
     * @param command the command code
     *
     * @return The POP3 protocol string command corresponding to a command code.
     */
    public static String getCommand(final int command)
    {
        return commands[command];
    }
}

⏎ org/apache/commons/net/pop3/POP3Command.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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