Java Mailing API

Sending Email with an attachment via Java Mailing API

Set up the properties either from the properties file or via final variables

private static final String EMAIL_HOST = "xxxx.xxxx.com";
private static final int EMAIL_PORT = 25;
private static final String EMAIL_FROM = "test.test@test.com";
private static final String PERSONAL_NAME = "Automatic Report Sending Service";

We can create a method that can be used to send emails from service sendJavaEmail(String to, String subject, String msg, String pathToAttachment)

Initially set up the properties

Properties emailProps = new Properties();
emailProps.put("mail.smtp.auth", false);
emailProps.put("mail.smtp.starttls.enable", "false");
emailProps.put("mail.smtp.host", EMAIL_HOST);
emailProps.put("mail.smtp.port", EMAIL_PORT);
emailProps.put("mail.smtp.ssl.trust", EMAIL_HOST);

Create a mail session

Session session = Session.getInstance(emailProps);

Set up message with email ids, subject line

Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(EMAIL_FROM,PERSONAL_NAME));
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
message.setSubject(subject);

Prepare the body part

BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText(msg);

Prepare the attachment

MimeBodyPart mimeBodyPart = new MimeBodyPart();
mimeBodyPart.setContent(msg, "text/html");
mimeBodyPart.attachFile(pathToAttachment);

Set up the Multipart message by adding the attachment and the email body

Multipart multipart = new MimeMultipart();
multipart.addBodyPart(mimeBodyPart);
multipart.addBodyPart(messageBodyPart);

Finally, prepare the message with all the contents

message.setContent(multipart);

Send the email

Transport.send(message);

The invoking method can then use this simple invocation and as per the properties set, the email will be sent

javaEmailService.sendJavaEmail("test.test@test.com","Some Daily Report "+ ZonedDateTime.now(ZoneOffset.UTC).format(DateTimeFormatter.ofPattern("E dd.MM.yyyy HH:MM:SSS a z")), "Mic Testing...1...2....3...",CSV_LOCATION);