Sending E-Mail to a Group of Recipients - Java Network

Java examples for Network:EMail

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Description

Sending E-Mail to a Group of Recipients 

import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

import javax.mail.Address;
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.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class Main {
  public static void main(String[] args) {
    List<String> emails = new ArrayList<>();
    emails.add("j@java2s.com");
    emails.add("b@java2s.com");
    emails.add("w@java2s.com");
    Properties properties = new Properties();
    properties.put("mail.smtp.host", "smtp.somewhere.com");
    properties.put("mail.smtp.auth", "true");

    Session session = Session.getDefaultInstance(properties,
        new MessageAuthenticator("username", "password"));

    Message message = new MimeMessage(session);
    try {
      message.setFrom(new InternetAddress("someone@somewhere.com"));
      message.setRecipients(Message.RecipientType.BCC, getRecipients(emails));
      message.setSubject("Subject");
      message.setContent("This is a test message", "text/plain");
      Transport.send(message);
    } catch (MessagingException e) {
      e.printStackTrace();
    }
  }

  private static Address[] getRecipients(List<String> emails)
      throws AddressException {
    Address[] addresses = new Address[emails.size()];
    for (int i = 0; i < emails.size(); i++) {
      addresses[i] = new InternetAddress(emails.get(i));
    }
    return addresses;
  }
}

class MessageAuthenticator extends Authenticator {
  PasswordAuthentication authentication = null;

  public MessageAuthenticator(String username, String password) {
    authentication = new PasswordAuthentication(username, password);
  }

  @Override
  protected PasswordAuthentication getPasswordAuthentication() {
    return authentication;
  }
}

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