Writing a Mail Sender In Java

To write a mail sender in Java, you can use the JavaMail API, which provides a set of classes for sending and receiving emails using the Simple Mail Transfer Protocol (SMTP) and other email protocols. Here's an example of how to send an email using the JavaMail API:

java

Copy code

import java.util.Properties;

import javax.mail.*;

import javax.mail.internet.*;

public class MailSender {

    public static void main(String[] args) {

        // SMTP server configuration

        String smtpHost = "smtp.gmail.com";

        String smtpPort = "587";

        String smtpUser = "your_username@gmail.com";

        String smtpPassword = "your_password";

        // Sender and recipient email addresses

        String from = "your_username@gmail.com";

        String to = "recipient_email@example.com";

        // Email message configuration

        String subject = "Test Email";

        String body = "This is a test email from Java.";

        // Set SMTP server properties

        Properties props = new Properties();

        props.put("mail.smtp.host", smtpHost);

        props.put("mail.smtp.port", smtpPort);

        props.put("mail.smtp.auth", "true");

        props.put("mail.smtp.starttls.enable", "true");

        // Create a Session object with authentication

        Session session = Session.getInstance(props, new Authenticator() {

            protected PasswordAuthentication getPasswordAuthentication() {

                return new PasswordAuthentication(smtpUser, smtpPassword);

            }

        });

        try {

            // Create a new email message

            MimeMessage message = new MimeMessage(session);

            message.setFrom(new InternetAddress(from));

            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

            message.setSubject(subject);

            message.setText(body);

            // Send the email message

            Transport.send(message);

            System.out.println("Email sent successfully.");

        } catch (MessagingException ex) {

            System.err.println("Error sending email: " + ex.getMessage());

        }

    }

}

In this example, we use the JavaMail API to configure the SMTP server properties, authenticate the user credentials, and create a MimeMessage object with the sender and recipient email addresses, subject, and body text. Finally, we send the email message using the Transport.send() method.

Note that you will need to include the JavaMail API JAR file in your classpath to use this code. You can download the JavaMail API from the Oracle website or from Maven Central.