public void sendMail(/*String from,String to, String subject, String text*/) {
    String host = "smtp.naver.com";
    String user = "123123213@naver.com";
    String password = "123123123123";

    Properties prop = new Properties();
    prop.put("mail.smtp.host", "smtp.naver.com");
    prop.put("mail.smtp.port", 587);
    prop.put("mail.smtp.auth", "true");
    prop.put("mail.smtp.ssl.enable", "true");
    prop.put("mail.smtp.ssl.trust", "smtp.naver.com");

    Session session = Session.getDefaultInstance(prop, new javax.mail.Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(user, password); }
    });
    try {
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress(user));
        message.addRecipient(Message.RecipientType.TO, new InternetAddress("ktko@ktko.com"));
        // 메일 제목
        message.setSubject("KTKO SMTP TEST1111"); // 메일 내용
        message.setText("KTKO Success!!"); // send the message
        Transport.send(message);
        System.out.println("Success Message Send");
    }catch (MessagingException e) { e.printStackTrace(); System.out.println("에러"); }

}