TLS/SSL使用javamail

// get the mail configuration options
String mailHost     = servletConfig.getServletContext().getInitParameter( "mailHost" );
String mailTo       = servletConfig.getServletContext().getInitParameter( "mailTo" );
String mailFrom     = servletConfig.getServletContext().getInitParameter( "mailFrom" );
String mailUser     = servletConfig.getServletContext().getInitParameter( "mailUser" );
String mailPassword = servletConfig.getServletContext().getInitParameter( "mailPassword" );
String mailTls      = servletConfig.getServletContext().getInitParameter( "mailTls" );
String mailSsl      = servletConfig.getServletContext().getInitParameter( "mailSsl" );
String mailPort     = servletConfig.getServletContext().getInitParameter( "mailPort" );
String mailDebug    = servletConfig.getServletContext().getInitParameter( "mailDebug" );

// check on the parameters
if (mailHost == null || mailTo == null || mailFrom == null ) {
  throw new ServletException( "Unable to get mail init parameters" );
}

// Build the message
StringBuilder message = new StringBuilder( "Start messagen" );

// add the rest of the message
message.apppend( "line by line construct the message" );

// set the base properties for sending email
Properties mailProperties = System.getProperties();
mailProperties.put( "mail.transport.protocol" , "smtp" );
mailProperties.put( "mail.smtp.host" , mailHost);

// check to see if we need to use a non standard port
if (mailPort != null ) {
  mailProperties.put( "mail.smtp.port" , mailPort);
}

// check to see if we need to use SSL
if (mailSsl != null ) {
  mailProperties.put( "mail.smtp.ssl.enable" , "true" );
  mailProperties.put( "mail.smtp.ssl.trust" , "*" );

  if (mailPort != null ) {
    mailProperties.put( "mail.smtp.socketFactory.port" , mailPort);
  } else {
    // assume default standard port for SSL SMTP
    mailProperties.put( "mail.smtp.socketFactory.port" , "465" );
  }

  mailProperties.put( "mail.smtp.socketFactory.class" , "javax.net.ssl.SSLSocketFactory" );
  mailProperties.put( "mail.smtp.socketFactory.fallback" , "false" );
}

// check to see if we need to output debug messages
if (mailDebug != null && mailDebug.equals( "yes" )) {
  mailProperties.put( "mail.debug" , "true" );
}

// do we need to use TLS?
if (mailTls != null && mailTls.equals( "yes" )) {
  mailProperties.put( "mail.smtp.starttls.enable" , "true" );
}

// start the email session
Session mailSession;

// do we need to do authentication
if (mailUser != null ) {
  mailProperties.put( "mail.smtp.auth" , true );
  mailSession = Session.getInstance(mailProperties, new SMTPAuthenticator(mailUser, mailPassword));
} else {
  mailSession = Session.getInstance(mailProperties, null );
}

try {
  // construct the message
  Message mailMessage = new MimeMessage(mailSession); // base object
  mailMessage.setFrom( new InternetAddress(mailFrom)); // set from address
  mailMessage.setRecipients(Message.RecipientType.TO, InternetAddress.parse(mailTo, false )); // set to address
  mailMessage.setSubject( "Email subject" ); // subject
  mailMessage.setText(message.toString()); // body of the message

  // add additional headers
  mailMessage.setHeader( "X-Mailer" , "JavaMail" );
  mailMessage.setSentDate( new Date());

  // send the message
  Transport.send(mailMessage);

} catch (javax.mail.internet.AddressException ex) {
  throw new ServletException( "Unable to prepare mail message" , ex);
} catch (javax.mail.MessagingException ex) {
  throw new ServletException( "Unable to send mail message" , ex);
}