For example :
- Confirming a user registration
- Password reset via emails
Following code segments can be used to send these emails using Google SMTP server. Here I am sharing two ways to do it.
- Using javax.mail.jar directly
- Using Apache commons email jar which wraps javax.mail
Using javax.mail
try {
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.auth", "true");
props.put("mail.debug", "false");
props.put("mail.smtp.ssl.enable", "true");
Session session = Session.getInstance(props, new EmailAuth());
Message msg = new MimeMessage(session);
InternetAddress from = new InternetAddress("sendersEmailAddress", "Sender's name");
msg.setFrom(from);
InternetAddress toAddress = new InternetAddress("Receiver's email");
msg.setRecipient(Message.RecipientType.TO, toAddress);
msg.setSubject("Test");
msg.setContent(msg.setContent("<html>\n" +
"<body>\n" +
"\n" +
"<a href=\"http://pushpalankajaya.blogspot.com\">\n" +
"This is a link</a>\n" +
"\n" +
"</body>\n" +
"</html>", "text/html");, "text/html");
Transport.send(msg);
} catch (UnsupportedEncodingException ex) {
ex.printStackTrace();
} catch (MessagingException ex) {
ex.printStackTrace();
}
}
static class EmailAuth extends Authenticator {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("sendersEmailAddress", "password");
}
}Using Apache commons e-mail
HtmlEmail email = new HtmlEmail();
email.setHostName("smtp.gmail.com");
email.setSmtpPort(465);
email.setAuthenticator(new DefaultAuthenticator("sendersEmailAddress", "password"));
email.setSSLOnConnect(true);
email.setFrom("Senders' email");
email.setSubject("TestMail- Alternative message");
email.setHtmlMsg("<html>\n" +
"<body>\n" +
"\n" +
"<a href=\"http://pushpalankajaya.blogspot.com\">\n" +
"This is a link</a>\n" +
"\n" +
"</body>\n" +
"</html>");
// set the alternative message
email.setTextMsg("This is a link: http://pushpalankajaya.blogspot.com");
email.addTo("lanka@wso2.com");
email.send();Here with setTextMsg method we can set a plain text message to be shown
at receiver's end if receiver is not supporting HTML content in emails.
If the gmail account used to send the email is 2-Step verification
enabled and you used your usual password to send the email in code, you
will get a similar error to the following.
javax.mail.AuthenticationFailedException: 534-5.7.9 Application-specific password required. Learn more at 534 5.7.9 http://support.google.com/accounts/bin/answer.py?answer=185833
The solution is to go to Account>Security>App passwords>Settings and generate a password for the app we are to run.
Reference
[1] - http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/javamail/javamail.html
[2] - http://commons.apache.org/proper/commons-email/userguide.html
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