Send email in Java with gmail SMTP

Send email in Java with gmail SMTP example.

MailUtil.java

package mailtest;

import java.io.UnsupportedEncodingException;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
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 MailUtil {

    private String SMTP_HOST = "smtp.gmail.com";
    private String FROM_ADDRESS = "yourname@gmail.com";
    private String PASSWORD = "yourpassword";
    private String FROM_NAME = "Sameera";

    public boolean sendMail(String[] recipients, String[] bccRecipients, String subject, String message) {
        try {
            Properties props = new Properties();
            props.put("mail.smtp.host", SMTP_HOST);
            props.put("mail.smtp.auth", "true");
            props.put("mail.debug", "false");
            props.put("mail.smtp.ssl.enable", "true");

            Session session = Session.getInstance(props, new SocialAuth());
            Message msg = new MimeMessage(session);

            InternetAddress from = new InternetAddress(FROM_ADDRESS, FROM_NAME);
            msg.setFrom(from);

            InternetAddress[] toAddresses = new InternetAddress[recipients.length];
            for (int i = 0; i < recipients.length; i++) {
                toAddresses[i] = new InternetAddress(recipients[i]);
            }
            msg.setRecipients(Message.RecipientType.TO, toAddresses);


            InternetAddress[] bccAddresses = new InternetAddress[bccRecipients.length];
            for (int j = 0; j < bccRecipients.length; j++) {
                bccAddresses[j] = new InternetAddress(bccRecipients[j]);
            }
            msg.setRecipients(Message.RecipientType.BCC, bccAddresses);

            msg.setSubject(subject);
            msg.setContent(message, "text/plain");
            Transport.send(msg);
            return true;
        } catch (UnsupportedEncodingException ex) {
            Logger.getLogger(MailUtil.class.getName()).log(Level.SEVERE, null, ex);
            return false;

        } catch (MessagingException ex) {
            Logger.getLogger(MailUtil.class.getName()).log(Level.SEVERE, null, ex);
            return false;
        }
    }

    class SocialAuth extends Authenticator {

        @Override
        protected PasswordAuthentication getPasswordAuthentication() {

            return new PasswordAuthentication(FROM_ADDRESS, PASSWORD);

        }
    }
}

Main.java

package mailtest;

public class Main {

    public static void main(String[] args) {
        String[] recipients = new String[]{"youremail@yahoo.com"};
        String[] bccRecipients = new String[]{"youremail@gmail.com"};
        String subject = "Hi this is test Mail";
        String messageBody = "Test Mail from codesstore.blogspot.com";

        new MailUtil().sendMail(recipients, bccRecipients, subject, messageBody);

    }
}
 

Note: mail.jar  is required.

Can add multiple recipients and BCC recipients

String[] recipients = new String[]{"youremail@yahoo.com","youremail2@yahoo.com"};

Instead of msg.setContent(message, "text/plain") you can use msg.setContent(message, "text/html") then you can add html tags to message body.

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Note:
Your gmail account  should have 'Access for less secure apps'.
Turn on following,
https://www.google.com/settings/security/lesssecureapps

Note (2022/06/15) :

'Access for less secure apps'  feature is no longer available and you need to create an app password.

Go to 'Account -> security -> Signing in to Google' and enable 2-step verificatiion.

Go to 

'Account -> security -> Signing in to Google -> App passwords' and create a password and use this password in smtp credentials.