Sending HTML emails with attachments via SMTP and Java mail API.

The code is clear enough and you won’t need any explanation…

package mail.send.datis.com;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMessage.RecipientType;
import javax.mail.internet.MimeMultipart;
import java.util.ArrayList;
import java.util.Date;
import java.util.Properties;

public class SMTPClient {

    private final String _CONTENT_HTML = "text/html";
    private final String _CONTENT_HOST = "mail.datispars.com";
    private final String _PORT = "25";
    private final String _USERNAME = "amir@datispars.com";
    private final String _PASSWORD = "your_password";

	public static void main(String[] args) throws MessagingException {
        SMTPClient sender = new SMTPClient();

       // sending mail, without attachment.
        sender.send("amir@datispars.com","kamran@datak.net", "Hi Kamran, how is going?" , "
this is a h1 tag so, it may appears in huge size!   

");

       // sending another mail, with 2 attachments.
        ArrayList fileNames = new ArrayList();
        fileNames.add("/home/amir/Documents/hi_world.pdf");
        fileNames.add("/home/amir/projects/datis/sendSMTP.zip");

       sender.send("amir@datispars.com","kamran@datak.net", "Hi Kamran, how is going?" , "
this is a h1 tag so, it may appears in huge size!   

", fileNames);

	}

	private void send(String from, String to, String subject, String body) throws MessagingException {
		Message message = new MimeMessage(getSession());
		message.addRecipient(RecipientType.TO, new InternetAddress(to));
		message.addFrom(new InternetAddress[] { new InternetAddress(from) });
		message.setSubject(subject);
        message.setContent(body, _CONTENT_HTML);
		Transport.send(message);
	}

    private void send(String from, String to, String subject, String body, ArrayList attachments) throws MessagingException {
        Message message = new MimeMessage(getSession());
        message.addRecipient(RecipientType.TO, new InternetAddress(to));
        message.addFrom(new InternetAddress[] { new InternetAddress(from) });
        message.setSubject(subject);
        MimeBodyPart mbp1 = new MimeBodyPart();
        mbp1.setText(body);
        mbp1.setContent(body, _CONTENT_HTML);
        Multipart mp = new MimeMultipart();
        mp.addBodyPart(mbp1);

        for (String fileName: attachments){
            MimeBodyPart mbp = new MimeBodyPart();
            FileDataSource fds = new FileDataSource(fileName);
            mbp.setDataHandler(new DataHandler(fds));
            mbp.setFileName(fds.getName());
            mp.addBodyPart(mbp);
        }

        message.setContent(mp);
        message.setSentDate(new Date());
        Transport.send(message);
    }

	private Session getSession() {
		Authenticator authenticator = new Authenticator();
		Properties properties = new Properties();
		properties.setProperty("mail.smtp.submitter", authenticator.getPasswordAuthentication().getUserName());
		properties.setProperty("mail.smtp.auth", "true");
		properties.setProperty("mail.smtp.host", _CONTENT_HOST);
		properties.setProperty("mail.smtp.port", _PORT);
		return Session.getInstance(properties, authenticator);
	}

	private class Authenticator extends javax.mail.Authenticator {
		private PasswordAuthentication authentication;

		public Authenticator() {
			authentication = new PasswordAuthentication(_USERNAME, _PASSWORD);
		}

		protected PasswordAuthentication getPasswordAuthentication() {
			return authentication;
		}
	}
}

Posted in Java