如何发送 HTML email

Question

I have to send HTML file via email but not as attachment.

Message simpleMessage = new MimeMessage(mailSession);
try {
   fromAddress = new InternetAddress(from);
   toAddress = new InternetAddress(to);

} catch (AddressException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
}

try {
    simpleMessage.setFrom(fromAddress);
    simpleMessage.setRecipient(RecipientType.TO, toAddress);

    simpleMessage.setSubject(subject);
    simpleMessage.setText(text);

    Transport.send(simpleMessage);
} catch (MessagingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

It is sending email simply with text message. I want to send HTML content which is stored in another file but not as attachment

Answer 1

Don't upcast your MimeMessage to Message :

MimeMessage simpleMessage = new MimeMessage(mailSession);

Then, when you want to set the message body, either call

simpleMessage.setText(text, "utf-8", "html");

or call

simpleMessage.setContent(text, "text/html; charset=utf-8");

If you'd rather use a charset other than utf-8 , substitute it in the appropriate place.

JavaMail has an extra, useless layer of abstraction that often leaves you holding classes like Multipart , Message , and Address , which all have much less functionality than the real subclasses ( MimeMultipart , MimeMessage , and InternetAddress ) that are actually getting constructed...

Answer 2

Here is my sendEmail java program. It's good to use setContent method of Message class object.

message.setSubject(message_sub);
message.setContent(message_text, "text/html; charset=utf-8");

sendEmail.java

package employee;

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

import java.io.UnsupportedEncodingException;
import java.util.Properties;

public class SendEmail {

    public static void sendEmail(String message_text, String send_to,String message_sub ) throws UnsupportedEncodingException {

        
        final String username = "hello@xyz.com";
        final String password = "password";

        Properties prop = new Properties();
        prop.put("mail.smtp.host", "us2.smtp.mailhostbox.com"); //replace your host address.
        prop.put("mail.smtp.port", "587");
        prop.put("mail.smtp.auth", "true");
        prop.put("mail.smtp.starttls.enable", "true"); //TLS
        
        Session session = Session.getInstance(prop,
                new javax.mail.Authenticator() {
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication(username, password);
                    }
                });

        try {

            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("sender@xyz.com", "Name from which mail has to be sent"));
            message.setRecipients(
                    Message.RecipientType.TO,
                    InternetAddress.parse(send_to)
            );
            message.setSubject(message_sub);
            message.setContent(message_text, "text/html; charset=utf-8");
            
          

            Transport.send(message);

            System.out.println("Done");

        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }

}