http://commons.apache.org/proper/commons-net/: Apache Commons Net library contains a collection of network utilities and protocol implementations. Supported protocols include: Echo, Finger, FTP, NNTP, NTP, POP3(S), SMTP(S), Telnet, Whois (The Apache Software Foundation)
  • Henrik Sorensen
  • Jeff Nadler
  • William Noto
  • Stephane ESTE-GRACIAS
  • Dan Armbrust
  • Yuval Kashtan
  • Joseph Hindsley
  • Rob Hasselbaum
  • Mario Ivankovits
  • Naz Irizarry (MITRE Corp)
  • Tapan Karecha
  • Jason Mathews (MITRE Corp)
  • Winston Ojeda (Quad/Graphics, Inc.)
  • Ted Wise
  • Bogdan Drozdowski
  • Jeffrey D. Brekke (Quad/Graphics, Inc.)
  • Steve Cohen (javactivity.org)
  • Bruno D'Avanzo (Hewlett-Packard)
  • Daniel F. Savarese (<a href="http://www.savarese.com/">Savarese Software Research</a>)
  • Rory Winston ()
  • Rory Winston () 
/*
 * 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  HELO are provided where the constant name is the same as the SMTP command. 
/**
 * 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
/**
     * The authorization command
     * @since 3.0
     */
    public static final int AUTH = 14 ;

    
The extended hello command

Since:3.0
/**
     * 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.



Params:
  • command – The command code.
Returns:The SMTP protcol command string corresponding to a specified
        command code.
/***
     * 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 final String getCommand(int command)
    {
        return _commands[command];
    }

}