Java App: Send SMTP Mail Example

การส่งเมล์โดยใช้ java สามารถใช้ class ใน javax.mail ได้ ซึ่งตัวอย่างข้างล่างเป็น utility ที่สามารถเรียกใช้ได้เลย

MailUtility.java

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package com.amadmonster.util.mail;

import java.util.Date;
import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

import org.apache.log4j.Logger;

public class MailUtility {
/** Get logger. */
private static Logger logger = Logger.getLogger(MailUtility.class);
Properties props;

public MailUtility(String smtpServer) {
    props = System.getProperties();
      props.put("mail.smtp.host", smtpServer);
 }

public void sendMail(String to, String from, String subject, String body) throws MailUtilityException {
    Session session = Session.getDefaultInstance(props);
    session.setDebug(false);

    Message msg = new MimeMessage(session);
    try {
          msg.setFrom(new InternetAddress(from));
          msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to, true));
          msg.setSubject(subject);
         // check mime type from Web: Content Type
          msg.setContent(body, "text/plain");
          msg.setText(body);
          msg.setSentDate(new Date());
         // -- Send the message --
          Transport.send(msg);
         logger.info("Message sent OK.");

    } catch (AddressException e) {
        throw new MailUtilityException("Incorrrect address format", e);
    } catch (MessagingException e) {
        throw new MailUtilityException("Error occurs when sending mail", e);
    }

}
}

MailUtilityException.java

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package com.amadmonster.util.mail;

public class MailUtilityException extends Exception {

public MailUtilityException(String message, Throwable cause) {
    super(message, cause);
}

public MailUtilityException(String message) {
    super(message);
}

public MailUtilityException(Throwable cause) {
    super(cause);
}

}

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Reference:
JavaMail quick start