How Can Java Applications Send Emails via Gmail, Yahoo, or Hotmail?

Sending Emails Using GMail, Yahoo, or Hotmail in Java Applications

Question:

Can Java applications utilize email accounts like GMail, Yahoo, or Hotmail to send emails? How can this be achieved?

Answer:

Step 1: Import JavaMail API

Before proceeding, ensure that you have downloaded and added the required JavaMail API jars to your classpath.

Step 2: GMail Configuration

The following Java code snippet demonstrates sending an email using a GMail account:

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class Main {

    private static String USER_NAME = "*****"; // GMail user name (before "@gmail.com")
    private static String PASSWORD = "********"; // GMail password
    private static String RECIPIENT = "[email protected]";

    public static void main(String[] args) {
        String from = USER_NAME;
        String pass = PASSWORD;
        String[] to = { RECIPIENT }; // List of recipient email addresses
        String subject = "Java send mail example";
        String body = "Welcome to JavaMail!";

        sendFromGMail(from, pass, to, subject, body);
    }

    private static void sendFromGMail(String from, String pass, String[] to, String subject, String body) {
        Properties props = System.getProperties();
        String host = "smtp.gmail.com";
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.user", from);
        props.put("mail.smtp.password", pass);
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");

        Session session = Session.getDefaultInstance(props);
        MimeMessage message = new MimeMessage(session);

        try {
            // Set email properties
            message.setFrom(new InternetAddress(from));

            // Create InternetAddress array for recipients
            InternetAddress[] toAddress = new InternetAddress[to.length];
            for (int i = 0; i < to.length; i++) {
                toAddress[i] = new InternetAddress(to[i]);
            }

            // Set recipients
            for (InternetAddress addr : toAddress) {
                message.addRecipient(Message.RecipientType.TO, addr);
            }

            // Set subject and body
            message.setSubject(subject);
            message.setText(body);

            // Establish connection and send email
            Transport transport = session.getTransport("smtp");
            transport.connect(host, from, pass);
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
        } catch (AddressException ae) {
            ae.printStackTrace();
        } catch (MessagingException me) {
            me.printStackTrace();
        }
    }
}

Note: Replace the USER_NAME, PASSWORD, RECIPIENT, subject, and body variables with the appropriate values.

Additional Considerations:

• Proper error handling in the catch blocks should be implemented.
• You may need to adjust the code for different email providers by updating the server address (host) and port (e.g., for Yahoo: host="smtp.mail.yahoo.com" and port="587").

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