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/smtp/SMTPCommand.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.smtp;

/**
 * SMTPCommand stores a set of constants for SMTP command codes.  To interpret
 * the meaning of the codes, familiarity with RFC 821 is assumed.
 * The mnemonic constant names are transcriptions from the code descriptions
 * of RFC 821.  For those who think in terms of the actual SMTP commands,
 * a set of constants such as {@link #HELO  HELO } are provided
 * where the constant name is the same as the SMTP command.
 */

public final class SMTPCommand
{


    public static final int HELO = 0;
    public static final int MAIL = 1;
    public static final int RCPT = 2;
    public static final int DATA = 3;
    public static final int SEND = 4;
    public static final int SOML = 5;
    public static final int SAML = 6;
    public static final int RSET = 7;
    public static final int VRFY = 8;
    public static final int EXPN = 9;
    public static final int HELP = 10;
    public static final int NOOP = 11;
    public static final int TURN = 12;
    public static final int QUIT = 13;

    /**
     * The authorization command
     * @since 3.0
     */
    public static final int AUTH = 14 ;

    /**
     * The extended hello command
     * @since 3.0
     */
    public static final int EHLO = 15 ;

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

    public static final int HELLO = HELO;
    public static final int LOGIN = HELO;
    public static final int MAIL_FROM = MAIL;
    public static final int RECIPIENT = RCPT;
    public static final int SEND_MESSAGE_DATA = DATA;
    public static final int SEND_FROM = SEND;
    public static final int SEND_OR_MAIL_FROM = SOML;
    public static final int SEND_AND_MAIL_FROM = SAML;
    public static final int RESET = RSET;
    public static final int VERIFY = VRFY;
    public static final int EXPAND = EXPN;
    // public static final int HELP = HELP;
    // public static final int NOOP = NOOP;
    // public static final int TURN = TURN;
    // public static final int QUIT = QUIT;
    public static final int LOGOUT = QUIT;

    // Cannot be instantiated
    private SMTPCommand()
    {}

    private static final String[] commands = {
                                          "HELO", "MAIL FROM:", "RCPT TO:", "DATA", "SEND FROM:", "SOML FROM:",
                                          "SAML FROM:", "RSET", "VRFY", "EXPN", "HELP", "NOOP", "TURN", "QUIT",
                                          "AUTH", "EHLO"
                                      };


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

    /**
     * Retrieve the SMTP protocol command string corresponding to a specified
     * command code.
     * <p>
     * @param command The command code.
     * @return The SMTP protcol command string corresponding to a specified
     *         command code.
     */
    public static String getCommand(final int command)
    {
        return commands[command];
    }

}

⏎ org/apache/commons/net/smtp/SMTPCommand.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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