Send e-mail via GMail

With this example we are going to see how to send an e-mail via GMail in a Java program. To do that you have to specify certain parameters about the SMTP host you have to use.

In short to send an email via GMail in a Java Application, one should follow these steps:

• Set smtp properties using a Properties object.
• Use put("mail.smtp.host", host) to set the smtp host.
• Use put(“mail.smtp.port”, 25) to set the smtp port.
• Use put("mail.debug", "true") if you want to recieve debugging messages.
• Use put("mail.transport.protocol", "smtp") to set the email protocol.
• Use put("mail.smtp.auth", "true") to set on the authentication.
• Use put("mail.smtp.starttls.enable", "true") to set on the tls protocol.
• Create e class tha extends Authenticator.
• Override getPasswordAuthentication that returns a new PasswordAuthentication(username, password).
• Use create a new Session.
• Create a Message using a MimeMessage.
• Set message source using setFrom(new InternetAddress(from)).
• Set message recipients use setRecipients(Message.RecipientType.TO, address).
• Use a Transport to send the email.
• Use send to send the email.

Let’s see the code:

package com.javacodegeeks.snippets.enterprise;

import java.util.Date;
import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SendEMailViaGMail {

	private static final String username = "myusername";
	private static final String password = "mypassword";

	public static void main(String[] args) {

		String host = "smtp.gmail.com";
		String from = "myuser@gmail.com";
		String to = "myrecipient@mailprovider.com";

		// Set properties
		Properties props = new Properties();
		props.put("mail.smtp.host", host);
		props.put("mail.smtp.port", 25);
		props.put("mail.debug", "true");
		props.put("mail.transport.protocol", "smtp");
		props.put("mail.smtp.auth", "true");
		props.put("mail.smtp.starttls.enable", "true");

		// Get session with authenticator
		Session session = Session.getInstance(props, new GMailAuthenticator());

		try {

		    // Instantiate a message
		    Message msg = new MimeMessage(session);

		    // Set the FROM message
		    msg.setFrom(new InternetAddress(from));

		    // The recipients can be more than one so we use an array but you can
		    // use 'new InternetAddress(to)' for only one address.
		    InternetAddress[] address = {new InternetAddress(to)};
		    msg.setRecipients(Message.RecipientType.TO, address);

		    // Set the message subject and date we sent it.
		    msg.setSubject("Email from JavaMail test");
		    msg.setSentDate(new Date());

		    // Set message content
		    msg.setText("Java Code Geeks - Java Examples & Code Snippets");

		    // Send the message
		    Transport.send(msg);

		}
		catch (MessagingException mex) {
		    mex.printStackTrace();
		}

	}

	private static class GMailAuthenticator extends Authenticator {
		@Override
		protected PasswordAuthentication getPasswordAuthentication() {
			return new PasswordAuthentication(username, password);
		}
	}

}

This was an example on how to send e-mail via GMail.

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