Send email using java mail api

Here is an example of how to send an email using the Java Mail API:

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;

public class SendEmail {
    public static void main(String[] args) {
        // Set the properties
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");

        // Create a session
        Session session = Session.getInstance(props,
                new Authenticator() {
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication("[email protected]", "your-password");
                    }
                });

        // Create a message
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress("[email protected]"));
        message.setRecipient(Message.RecipientType.TO, new InternetAddress("[email protected]"));
        message.setSubject("Test Email");
        message.setText("This is a test email sent using Java Mail API");

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

This code sets up a session with the Gmail SMTP server using the Session class and the Authenticator class. It then creates a MimeMessage object and sets the from address, recipient address, subject, and text of the message. Finally, it sends the message using the Transport class.

You'll need to replace the placeholders with your own email address and password, as well as the recipient's email address.

Note: Make sure to enable less secure apps in your Google account settings if you're using Gmail.

Also, you can use Transport.send(message) to send the message asynchronously, or you can use message.saveChanges() to save the message and then use Transport.send(message) to send it.

You can also use Multipart to send HTML emails with attachments.

Multipart multipart = new MimeMultipart();
MimeBodyPart textPart = new MimeBodyPart();
textPart.setText("This is a test email sent using Java Mail API");
multipart.addBodyPart(textPart);

MimeBodyPart htmlPart = new MimeBodyPart();
htmlPart.setContent("<html><body>This is a test email sent using Java Mail API</body></html>", "text/html");
multipart.addBodyPart(htmlPart);

MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress("[email protected]"));
message.setRecipient(Message.RecipientType.TO, new InternetAddress("[email protected]"));
message.setSubject("Test Email");
message.setContent(multipart);

Transport.send(message);

You can also use FileDataSource to attach files to the email.

FileDataSource fileDataSource = new FileDataSource("path/to/file.txt");
MimeBodyPart attachmentPart = new MimeBodyPart();
attachmentPart.setDataHandler(new DataHandler(fileDataSource));
multipart.addBodyPart(attachmentPart);

Make sure to handle exceptions properly, and also make sure to close the Session and Transport objects when you're done with them.

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Send email using java mail api