Java/Network Protocol/SMTP
A Thin SMTP Client
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.net.Socket;
import java.text.DateFormat;
import java.util.Date;
import java.util.Locale;
public class Main {
public static void main(String[] args) throws Exception {
String host = "host";
int port = 25;
String from = "from@from.net";
String toAddr = "to@to.net";
Socket servSocket = new Socket(host, port);
DataOutputStream os = new DataOutputStream(servSocket.getOutputStream());
DataInputStream is = new DataInputStream(servSocket.getInputStream());
if (servSocket != null && os != null && is != null) {
os.writeBytes("HELO\r\n");
os.writeBytes("MAIL From:" + from + " \r\n");
os.writeBytes("RCPT To:" + toAddr + "\r\n");
os.writeBytes("DATA\r\n");
os.writeBytes("X-Mailer: Java\r\n");
os.writeBytes("DATE: " + DateFormat.getDateInstance(DateFormat.FULL, Locale.US).format(new Date()) + "\r\n");
os.writeBytes("From:" + from + "\r\n");
os.writeBytes("To:" + toAddr + "\r\n");
}
os.writeBytes("Subject:\r\n");
os.writeBytes("body\r\n");
os.writeBytes("\r\n.\r\n");
os.writeBytes("QUIT\r\n");
String responseline;
while ((responseline = is.readUTF()) != null) {
if (responseline.indexOf("Ok") != -1)
break;
}
}
}
SMTP package to send a message to the specified recipients
/*
* Copyright 2001-2005 The Apache Software Foundation
*
* Licensed 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 examples;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.Enumeration;
import java.util.Vector;
import org.apache.rumons.net.io.Util;
import org.apache.rumons.net.smtp.SMTPClient;
import org.apache.rumons.net.smtp.SMTPReply;
import org.apache.rumons.net.smtp.SimpleSMTPHeader;
/***
* This is an example program using the SMTP package to send a message
* to the specified recipients. It prompts you for header information and
* a filename containing the message.
* <p>
***/
public class mail
{
public final static void main(String[] args)
{
String sender, recipient, subject, filename, server, cc;
Vector ccList = new Vector();
BufferedReader stdin;
FileReader fileReader = null;
Writer writer;
SimpleSMTPHeader header;
SMTPClient client;
Enumeration en;
if (args.length < 1)
{
System.err.println("Usage: mail smtpserver");
System.exit(1);
}
server = args[0];
stdin = new BufferedReader(new InputStreamReader(System.in));
try
{
System.out.print("From: ");
System.out.flush();
sender = stdin.readLine();
System.out.print("To: ");
System.out.flush();
recipient = stdin.readLine();
System.out.print("Subject: ");
System.out.flush();
subject = stdin.readLine();
header = new SimpleSMTPHeader(sender, recipient, subject);
while (true)
{
System.out.print("CC <enter one address per line, hit enter to end>: ");
System.out.flush();
// Of course you don"t want to do this because readLine() may be null
cc = stdin.readLine().trim();
if (cc.length() == 0)
break;
header.addCC(cc);
ccList.addElement(cc);
}
System.out.print("Filename: ");
System.out.flush();
filename = stdin.readLine();
try
{
fileReader = new FileReader(filename);
}
catch (FileNotFoundException e)
{
System.err.println("File not found. " + e.getMessage());
}
client = new SMTPClient();
client.addProtocolCommandListener(new PrintCommandListener(
new PrintWriter(System.out)));
client.connect(server);
if (!SMTPReply.isPositiveCompletion(client.getReplyCode()))
{
client.disconnect();
System.err.println("SMTP server refused connection.");
System.exit(1);
}
client.login();
client.setSender(sender);
client.addRecipient(recipient);
en = ccList.elements();
while (en.hasMoreElements())
client.addRecipient((String)en.nextElement());
writer = client.sendMessageData();
if (writer != null)
{
writer.write(header.toString());
Util.copyReader(fileReader, writer);
writer.close();
client.rupletePendingCommand();
}
fileReader.close();
client.logout();
client.disconnect();
}
catch (IOException e)
{
e.printStackTrace();
System.exit(1);
}
}
}
SMTP talker class
/*
* Copyright (c) Ian F. Darwin, http://www.darwinsys.ru/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS""
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Java, the Duke mascot, and all variants of Sun"s Java "steaming coffee
* cup" logo are trademarks of Sun Microsystems. Sun"s, and James Gosling"s,
* pioneering role in inventing and promulgating (and standardizing) the Java
* language and environment is gratefully acknowledged.
*
* The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
* inventing predecessor languages C and C++ is also gratefully acknowledged.
*/
///
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.ConnectException;
import java.net.NoRouteToHostException;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.StringTokenizer;
/**
* SMTP talker class, usable standalone (as a SendMail(8) backend) or inside
* applications such as JabaDex that need to send mail..
*
* OBSOLETE!! Use javax.mail instead, now that it"s available!
*
* Needs more parameterization - bit of a hack to start. Should use same
* interface as Mailer (subclass, and override doSend()).
*
* @author Ian Darwin
* @version $Id: SmtpTalk.java,v 1.10 2002/10/26 13:53:45 ian Exp $
*/
public class SmtpTalk {
BufferedReader is;
PrintStream os;
private boolean debug = true;
private String host;
/**
* A simple main program showing the class in action.
*
* TODO generalize to accept From arg, read msg on stdin
*/
public static void main(String[] argv) {
if (argv.length != 2) {
System.err.println("Usage: java SmtpTalk host user");
System.exit(1);
}
try {
SmtpTalk st = new SmtpTalk(argv[0]);
System.out.println("SMTP Talker ready");
st.converse("MAILER-DAEMON@daroad.darwinsys.ru", argv[1],
"Test message", "Hello there");
} catch (Exception ig) {
System.err.println(ig.getMessage());
System.exit(0);
}
}
/**
* Constructor taking a server hostname as argument.
*/
SmtpTalk(String server) throws Exception {
host = server;
try {
Socket s = new Socket(host, 25);
is = new BufferedReader(new InputStreamReader(s.getInputStream()));
os = new PrintStream(s.getOutputStream());
} catch (NoRouteToHostException e) {
die( "No route to host " + host);
} catch (ConnectException e) {
die("Connection Refused by " + host);
} catch (UnknownHostException e) {
die("Unknown host " + host);
} catch (IOException e) {
die( "I/O error setting up socket streams\n" + e);
}
}
/** Send a command with an operand */
protected void send_cmd(String cmd, String oprnd) {
send_cmd(cmd + " " + oprnd);
}
/* Send a command with no operand */
protected void send_cmd(String cmd) {
if (debug)
System.out.println(">>> " + cmd);
os.print(cmd + "\r\n");
}
/** Send_text sends the body of the message. */
public void send_text(String text) {
os.print(text + "\r\n");
}
/** Expect (read and check for) a given reply */
protected boolean expect_reply(String rspNum) throws Exception {
String s = null;
try {
s = is.readLine();
} catch (IOException e) {
die( "I/O error reading from host " + host + " " + e);
}
if (debug)
System.out.println("<<< " + s);
return s.startsWith(rspNum + " ");
}
/**
* Convenience routine to print message & exit, like K&P error(), perl
* die(), ...
*
* @param ret
* Numeric value to pass back
* @param msg
* Error message to be printed on stdout.
*/
protected void die(String msg) throws Exception {
throw new Exception( msg);
}
/**
* send one Mail message to one or more recipients via smtp to server
* "host".
*/
public void converse(String sender, String recipients, String subject,
String body) throws Exception {
if (!expect_reply("220"))
die("did not get SMTP greeting");
send_cmd("HELO", "darwinsys.ru");
if (!expect_reply("250"))
die("did not ack our HELO");
send_cmd("MAIL", "From:<" + sender + ">"); // no spaces!
if (!expect_reply("250"))
die("did not ack our MAIL command");
StringTokenizer st = new StringTokenizer(recipients);
while (st.hasMoreTokens()) {
String r = st.nextToken();
send_cmd("RCPT", "To:<" + r + ">");
if (!expect_reply("250"))
die("didn"t ack RCPT " + r);
}
send_cmd("DATA");
if (!expect_reply("354"))
die("did not want our DATA!");
send_text("From: " + sender);
send_text("To: " + recipients);
send_text("Subject: " + subject);
send_text("");
send_text(body + "\r");
send_cmd(".");
if (!expect_reply("250"))
die("Mail not accepted");
send_cmd("QUIT");
if (!expect_reply("221"))
die("Other end not closing down");
}
}
