JavaMail API Part 3 - Send attachment in email

Here is an example to send an email with attachment from your machine.

We assume that mail server is running on localhost and is connected to internet to send email.



For prerequisites please refer to my previous article on JavaMail API.

// File Name SendFileEmail.java



import java.util.*;

import javax.mail.*;

import javax.mail.internet.*;

import javax.activation.*;



public class SendFileEmail

{

   public static void main(String [] args)

   {

    

      // Recipient's email ID needs to be mentioned.

      String to = "abcd@gmail.com";

      // Sender's email ID needs to be mentioned

      String from = "web@gmail.com";

      // Assuming you are sending email from localhost

      String host = "localhost";

      // Get system properties

      Properties properties = System.getProperties();

      // Setup mail server

      properties.setProperty("mail.smtp.host", host);

      // Get the default Session object.

      Session session = Session.getDefaultInstance(properties);

      try{
         // Create a default MimeMessage object.

         MimeMessage message = new MimeMessage(session);

         // Set From: header field of the header.

         message.setFrom(new InternetAddress(from));

         // Set To: header field of the header.

         message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

         // Set Subject: header field

         message.setSubject("This is the Subject Line!");

         // Create the message part

         BodyPart messageBodyPart = new MimeBodyPart();

         // Fill the message

         messageBodyPart.setText("This is message body");

        

         // Create a multipar message

         Multipart multipart = new MimeMultipart();

         // Set text message part

         multipart.addBodyPart(messageBodyPart);

         // Part two is attachment

         messageBodyPart = new MimeBodyPart();

         String filename = "file.txt";

         DataSource source = new FileDataSource(filename);

         messageBodyPart.setDataHandler(new DataHandler(source));

         messageBodyPart.setFileName(filename);

         multipart.addBodyPart(messageBodyPart);

         // Send the complete message parts

         message.setContent(multipart );

         // Send message

         Transport.send(message);

         System.out.println("Sent message successfully....");

      }catch (MessagingException mex) {

         mex.printStackTrace();

      }

   }

}

Compile and run this program to send an HTML email:

$ java SendFileEmail

Sent message successfully....

User Authentication

If it is required to provide user ID and Password to the email server for authentication purpose then you can set these properties as follows:

props.setProperty("mail.user", "myuser");

props.setProperty("mail.password", "mypwd");

Rest of the email sending mechanism would remain as explained above.