TLS/SSL使用javamail

最新推荐文章于 2020-08-11 10:57:31 发布

原创最新推荐文章于 2020-08-11 10:57:31 发布 · 310 阅读

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本文介绍如何从Java Web应用中配置并发送电子邮件。通过读取初始化参数来设置邮件服务器的详细信息，并使用JavaMail API构建邮件消息。此外，还介绍了如何处理SMTP认证、SSL/TLS加密及调试选项。

// 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);
}