Mailing Application in JAVA using JAVA mail API

How to build Mailing Application in JAVA

         The JavaMail API provides a platform-independent and protocol-independent framework to build mail and messaging applications. To send an e-mail using your Java Application is simple enough but to start with you should haveJavaMail API and Java Activation Framework (JAF) installed on your machine.

You need to add mail.jar and activation.jar files in your CLASSPATH.

import java.util.*;

import javax.mail.*;

import javax.mail.internet.*;

import javax.activation.*;

public class SendEmail

{

   public static void main(String [] args)

   {   

      // Recipient's email ID needs to be mentioned.

      String to = "abcd@gmail.com";

      // Sender's email ID needs to be mentioned

      String from = "web@gmail.com";

      // Assuming you are sending email from localhost

      String host = "localhost";

      // Get system properties

      Properties properties = System.getProperties();

      // Setup mail server

      properties.setProperty("mail.smtp.host", host);

      // Get the default Session object.

      Session session = Session.getDefaultInstance(properties);

      try{

         // Create a default MimeMessage object.

         MimeMessage message = new MimeMessage(session);

         // Set From: header field of the header.

         message.setFrom(new InternetAddress(from));

         // Set To: header field of the header.

         message.addRecipient(Message.RecipientType.TO,

                                  new InternetAddress(to));

         // Set Subject: header field

         message.setSubject("This is the Subject Line!");

         // Now set the actual message

         message.setText("This is actual message");

         // Send message

         Transport.send(message);

         System.out.println("Sent message successfully....");

      }catch (MessagingException mex) {

         mex.printStackTrace();

      }

   }

}

Compile and run this program to send a simple e-mail:

$ java SendEmail

Sent message successfully....

If you want to send an e-mail to multiple recipients then following methods would be used to specify multiple e-mail IDs:

void addRecipients(Message.RecipientType type, 

                   Address[] addresses)

throws MessagingException

Here is the description of the parameters:

·         type: This would be set to TO, CC or BCC. Here CC represents Carbon Copy and BCC represents Black Carbon Copy. Example Message.RecipientType.TO

·         addresses: This is the array of email ID. You would need to use InternetAddress() method while specifying email IDs

User Authentication Part:

If it is required to provide user ID and Password to the e-mail server for authentication purpose then you can set these properties as follows:

·          props.setProperty("mail.user", "myuser");

·          props.setProperty("mail.password", "mypwd");

JavaMail API – Sending Email Via Gmail SMTP Example

Here are two examples to show you how to use JavaMail API method to send an email via Gmail SMTP server, using both TLS and SSL connection.

To run this example, you need two dependency libraries – javaee.jar and mail.jar, both are bundle in JavaEE SDK.

Outgoing Mail (SMTP) Server

requires TLS or SSL: smtp.gmail.com (use authentication)

Use Authentication: Yes

Port for TLS/STARTTLS: 587

Port for SSL: 465

1. JavaMail – GMail via TLS

Send an Email via Gmail SMTP server using TLS connection.

package com.mkyong.common;

import java.util.Properties;

import javax.mail.Message;

import javax.mail.MessagingException;

import javax.mail.PasswordAuthentication;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeMessage;

public class SendMailTLS {

        public static void main(String[] args) {

               final String username = "username@gmail.com";

               final String password = "password";

               Properties props = new Properties();

               props.put("mail.smtp.auth", "true");

               props.put("mail.smtp.starttls.enable", "true");

               props.put("mail.smtp.host", "smtp.gmail.com");

               props.put("mail.smtp.port", "587");

               Session session = Session.getInstance(props,

                 new javax.mail.Authenticator() {

                       protected PasswordAuthentication getPasswordAuthentication() {

                               return new PasswordAuthentication(username, password);

                       }

                 });

               try {

                       Message message = new MimeMessage(session);

                       message.setFrom(new InternetAddress("from-email@gmail.com"));

                       message.setRecipients(Message.RecipientType.TO,

                               InternetAddress.parse("to-email@gmail.com"));

                       message.setSubject("Testing Subject");

                       message.setText("Dear Mail Crawler,"

                               + "\n\n No spam to my email, please!");

                       Transport.send(message);

                       System.out.println("Done");

               } catch (MessagingException e) {

                       throw new RuntimeException(e);

               }

        }

}

2. JavaMail – GMail via SSL

Send an Email via Gmail SMTP server using SSL connection.

package com.mkyong.common;

import java.util.Properties;

import javax.mail.Message;

import javax.mail.MessagingException;

import javax.mail.PasswordAuthentication;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeMessage;

public class SendMailSSL {

        public static void main(String[] args) {

               Properties props = new Properties();

               props.put("mail.smtp.host", "smtp.gmail.com");

               props.put("mail.smtp.socketFactory.port", "465");

               props.put("mail.smtp.socketFactory.class",

                               "javax.net.ssl.SSLSocketFactory");

               props.put("mail.smtp.auth", "true");

               props.put("mail.smtp.port", "465");

               Session session = Session.getDefaultInstance(props,

                       new javax.mail.Authenticator() {

                               protected PasswordAuthentication getPasswordAuthentication() {

                                      return new PasswordAuthentication("username","password");

                               }

                       });

               try {

                       Message message = new MimeMessage(session);

                       message.setFrom(new InternetAddress("from@no-spam.com"));

                       message.setRecipients(Message.RecipientType.TO,

                                      InternetAddress.parse("to@no-spam.com"));

                       message.setSubject("Testing Subject");

                       message.setText("Dear Mail Crawler," +

                                      "\n\n No spam to my email, please!");

                       Transport.send(message);

                       System.out.println("Done");

               } catch (MessagingException e) {

                       throw new RuntimeException(e);

               }

        }

}