Java Tutorial/Email/Email Attachment
Get Attachment File Name
<source lang="java">
import java.util.Properties; import javax.mail.Authenticator; import javax.mail.Folder; import javax.mail.Message; import javax.mail.Part; import javax.mail.PasswordAuthentication; import javax.mail.Session; import javax.mail.URLName; import javax.mail.internet.InternetAddress; public class MainClass {
public static void main(String[] args) throws Exception { URLName server = new URLName("protocol://username@host/foldername"); Session session = Session.getDefaultInstance(new Properties(), new MailAuthenticator()); Folder folder = session.getFolder(server); if (folder == null) { System.out.println("Folder " + server.getFile() + " not found."); System.exit(1); } folder.open(Folder.READ_ONLY); Message[] messages = folder.getMessages(); for (int i = 0; i < messages.length; i++) { System.out.println(messages[i].getSize() + " bytes long."); System.out.println(messages[i].getLineCount() + " lines."); String disposition = messages[i].getDisposition(); if (disposition == null){ ; // do nothing }else if (disposition.equals(Part.INLINE)) { System.out.println("This part should be displayed inline"); } else if (disposition.equals(Part.ATTACHMENT)) { System.out.println("This part is an attachment"); String fileName = messages[i].getFileName(); System.out.println("The file name of this attachment is " + fileName); } String description = messages[i].getDescription(); if (description != null) { System.out.println("The description of this message is " + description); } } folder.close(false); }
} class MailAuthenticator extends Authenticator {
public MailAuthenticator() { } public PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication("username", "password"); }
}</source>
How to use the FileDataSource to send a file via mail
<source lang="java">
/*
* @(#)sendfile.java 1.11 03/06/19 * * Copyright 1996-2003 Sun Microsystems, Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistribution 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. * * Neither the name of Sun Microsystems, Inc. or the names of contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * This software is provided "AS IS," without a warranty of any kind. ALL * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND * ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES OR LIABILITIES * SUFFERED BY LICENSEE AS A RESULT OF OR RELATING TO USE, MODIFICATION * OR DISTRIBUTION OF THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL * SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR * FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, * ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS * BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. * * You acknowledge that Software is not designed, licensed or intended * for use in the design, construction, operation or maintenance of any * nuclear facility. */
import java.util.*; import java.io.*; import javax.mail.*; import javax.mail.internet.*; import javax.activation.*; /**
* sendfile will create a multipart message with the second* block of the message being the given file.
*
* This demonstrates how to use the FileDataSource to send
* a file via mail.<P>
*
* usage: java sendfile to from smtp file true|false
* where to and from are the destination and
* origin email addresses, respectively, and smtp
* is the hostname of the machine that has smtp server
* running. file is the file to send. The next parameter
* either turns on or turns off debugging during sending.
*
* @author Christopher Cotton
*/
public class sendfile {
public static void main(String[] args) {
if (args.length != 5) {
System.out.println("usage: java sendfile <to> <from> <smtp> <file> true|false");
System.exit(1);
}
String to = args[0];
String from = args[1];
String host = args[2];
String filename = args[3];
boolean debug = Boolean.valueOf(args[4]).booleanValue();
String msgText1 = "Sending a file.\n";
String subject = "Sending a file";
// create some properties and get the default Session
Properties props = System.getProperties();
props.put("mail.smtp.host", host);
Session session = Session.getInstance(props, null);
session.setDebug(debug);
try {
// create a message
MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(from));
InternetAddress[] address = {new InternetAddress(to)};
msg.setRecipients(Message.RecipientType.TO, address);
msg.setSubject(subject);
// create and fill the first message part
MimeBodyPart mbp1 = new MimeBodyPart();
mbp1.setText(msgText1);
// create the second message part
MimeBodyPart mbp2 = new MimeBodyPart();
// attach the file to the message
FileDataSource fds = new FileDataSource(filename);
mbp2.setDataHandler(new DataHandler(fds));
mbp2.setFileName(fds.getName());
// create the Multipart and add its parts to it
Multipart mp = new MimeMultipart();
mp.addBodyPart(mbp1);
mp.addBodyPart(mbp2);
// add the Multipart to the message
msg.setContent(mp);
// set the Date: header
msg.setSentDate(new Date());
// send the message
Transport.send(msg);
} catch (MessagingException mex) {
mex.printStackTrace();
Exception ex = null;
if ((ex = mex.getNextException()) != null) {
ex.printStackTrace();
}
}
}
}</source>