How do I send an e-mail in Java?

Question

I need to send e-mails from a servlet running within Tomcat. I\'ll always send to the same recipient with the same subject, but with different contents.

What\'s a sim

Answer 1

To followup on jon's reply, here's an example of sending a mail using simple-java-mail.

The idea is that you don't need to know about all the technical (nested) parts that make up an email. In that sense it's a lot like Apache's commons-email, except that Simple Java Mail is a little bit more straightforward than Apache's mailing API when dealing with attachments and embedded images. Spring's mailing facility works as well but is a bit awkward in use (for example it requires an anonymous innerclass) and ofcourse you need to a dependency on Spring which gets you much more than just a simple mailing library, since it its base it was designed to be an IOC solution.

Simple Java Mail btw is a wrapper around the JavaMail API.

final Email email = new Email();

email.setFromAddress("lollypop", "lolly.pop@somemail.com"); 
email.setSubject("hey");
email.addRecipient("C. Cane", "candycane@candyshop.org", RecipientType.TO);
email.addRecipient("C. Bo", "chocobo@candyshop.org", RecipientType.BCC); 
email.setText("We should meet up! ;)"); 
email.setTextHTML("<img src='cid:wink1'><b>We should meet up!</b><img src='cid:wink2'>");

// embed images and include downloadable attachments 
email.addEmbeddedImage("wink1", imageByteArray, "image/png");
email.addEmbeddedImage("wink2", imageDatesource); 
email.addAttachment("invitation", pdfByteArray, "application/pdf");
email.addAttachment("dresscode", odfDatasource);

new Mailer("smtp.host.com", 25, "username", "password").sendMail(email);
// or alternatively, pass in your own traditional MailSession object.
new Mailer(preconfiguredMailSession).sendMail(email);

• simple-java-mail
• Apache Commons mail
• Spring mail
• JavaMail

Answer 2

Yet another option that wraps the Java Mail API is Apache's commons-email.

From their User Guide.

SimpleEmail email = new SimpleEmail();
email.setHostName("mail.myserver.com");
email.addTo("jdoe@somewhere.org", "John Doe");
email.setFrom("me@apache.org", "Me");
email.setSubject("Test message");
email.setMsg("This is a simple test of commons-email");
email.send();

Answer 3

Tested Code send Mail with attachment :

  public class SendMailNotificationWithAttachment {

            public static void mailToSendWithAttachment(String messageTosend, String snapShotFile) {

                String to = Constants.MailTo;
                String from = Constants.MailFrom;
                String host = Constants.smtpHost;// or IP address
                String subject = Constants.subject;
                // Get the session object
                Properties properties = System.getProperties();
                properties.setProperty("mail.smtp.host", host);
                Session session = Session.getDefaultInstance(properties);
                try {
                    MimeMessage message = new MimeMessage(session);
                    message.setFrom(new InternetAddress(from));
                    message.addRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
                    message.setSubject(subject);
                    // message.setText(messageTosend);
                    BodyPart messageBodyPart = new MimeBodyPart();
                    messageBodyPart.setText(messageTosend);
                    Multipart multipart = new MimeMultipart();
                    multipart.addBodyPart(messageBodyPart);

                    messageBodyPart = new MimeBodyPart();
                    String filepath = snapShotFile;

                    DataSource source = new FileDataSource(filepath);
                    messageBodyPart.setDataHandler(new DataHandler(source));

                    Path p = Paths.get(filepath);
                    String NameOffile = p.getFileName().toString();

                    messageBodyPart.setFileName(NameOffile);
                    multipart.addBodyPart(messageBodyPart);

                    // Send the complete message parts
                    message.setContent(multipart);

                    // Send message
                    Transport.send(message);

        //          Log.info("Message is sent Successfully");
        //          System.out.println("Message is sent Successfully");
                    System.out.println("Message is sent Successfully");
    } catch (MessagingException e) {
    //          Log.error("Mail sending is Failed " + "due to" + e);
                SendMailNotificationWithAttachment smnwa = new SendMailNotificationWithAttachment();
                smnwa.mailSendFailed(e);
                throw new RuntimeException(e);
            }
        }
public void mailSendFailed(MessagingException e) {
        System.out.println("Mail sending is Failed " + "due to" + e);
        Log log = new Log();
        log.writeIntoLog("Mail sending is Failed " + "due to" + e.toString(), false);
    }

}

Answer 4

use the Java Mail library

import javax.mail.*

...

Session mSession = Session.getDefaultInstance(new Properties());
Transport mTransport = null;
mTransport = mSession.getTransport("smtp");
mTransport.connect(cServer, cUser, cPass);
MimeMessage mMessage = new MimeMessage(mSession);
mTransport.sendMessage(mMessage,  mMessage.getAllRecipients());
mTransport.close();

This is a truncated version of the code I use to have an application send emails. Obviously, putting a body and recipients in the message before sending it is probably going to suit you better.

The maven repository location is artifactId: javax.mail, groupId: mail.

Answer 5

Here's my code for doing that:

import javax.mail.*;
import javax.mail.internet.*;

// Set up the SMTP server.
java.util.Properties props = new java.util.Properties();
props.put("mail.smtp.host", "smtp.myisp.com");
Session session = Session.getDefaultInstance(props, null);

// Construct the message
String to = "you@you.com";
String from = "me@me.com";
String subject = "Hello";
Message msg = new MimeMessage(session);
try {
    msg.setFrom(new InternetAddress(from));
    msg.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
    msg.setSubject(subject);
    msg.setText("Hi,\n\nHow are you?");

    // Send the message.
    Transport.send(msg);
} catch (MessagingException e) {
    // Error.
}

You can get the JavaMail libraries from Sun here: http://java.sun.com/products/javamail/