Java send smtp mail using Gmail

Today I wanted to make a mail notification mechanism for a project of mine. After some web searching I stumbled upon a mkyong.com tutorial where he uses SMTP with Java Mail API to send emails via Gmail. I modified the code in some places to make it more general and API friendly. Now I can send emails easily using different authentication and encryption methods (TLS,SSL)! I hope you find it useful!

import java.util.Properties;
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;

/**
 *
 * Simple SMTP mail class built using the example from: <a
 * href="http://www.mkyong.com/java/javamail-api-sending-email-via-gmail-smtp-example">mkyong.com</a>
 *
 * <p>If you get {@link java.net.UnknownHostException}: smtp.gmail.com , try
 * ping smtp.gmail.com and make sure you got a response (able to access). Often
 * times, your connection may block by your firewall or proxy behind.</p>
 */
public class MailSender {

    private String userName;
    private String password;
    private Properties props;
    private final static String CONTENT_CHARSET = "text/html; charset=utf-8";

    public MailSender(Properties props) {
        this.userName = (String) props.get("userName");
        this.password = (String) props.get("password");
        this.props = props;
    }

    public void sendMail(String subject, String bodyText) throws MessagingException {
        sendMail(subject, bodyText, false);
    }

    public void sendMail(String subject, String bodyText, boolean isHtmlBody) throws MessagingException {
        Session session = Session.getDefaultInstance(props,
                new javax.mail.Authenticator() {

                    @Override
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication(userName, password);
                    }
                });

        Message message = new MimeMessage(session);

        // set from (sender) address
        message.setFrom(new InternetAddress((String) props.get("fromAddress")));

        // set recipients addresses (may be more than one)
        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse((String) props.get("recipientsAddresses")));

        // set message subject
        message.setSubject(subject);

        // if it is html change multipart information
        if (isHtmlBody) {
            message.setContent(bodyText, CONTENT_CHARSET);
        } else {
            message.setText(bodyText);
        }

        Transport.send(message);

        System.out.println("Done");


    }

    public static void main(String[] args) throws MessagingException {

        Properties proper = new Properties();

        // put credentials
        proper.put("userName", "user");
        proper.put("password", "password");

        // put server information
        proper.put("mail.smtp.host", "smtp.gmail.com");
        proper.put("mail.smtp.socketFactory.port", "465");
        proper.put("mail.smtp.socketFactory.class",
                "javax.net.ssl.SSLSocketFactory");
        proper.put("mail.smtp.auth", "true");
        proper.put("mail.smtp.port", "465");

        // if you do not want to use authentication
        //proper.put("mail.smtp.host", "192.168.1.13");
        //proper.put("mail.smtp.socketFactory.port", "25");
        //proper.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        //proper.put("mail.smtp.connectiontimeout",30000);
        //proper.put("mail.smtp.auth", "false");
        //proper.put("mail.smtp.port", "25");

        // put sender information
        proper.put("fromAddress", "bob@gmail.com");

        // put recipient information
        proper.put("recipientsAddresses", "bob@gmail.com");

        new MailSender(proper).sendMail("Bob", "Some text body for bob");
    }
}

And if you are using maven you can add the dependency to Java Mail API with the following code to your pom.xml. For me, the latest version is 1.4.6

<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4.6</version>
</dependency>
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About cmanios

programming
This entry was posted in Java, Networking, smtp and tagged , , , , , , . Bookmark the permalink.

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