Java Mail Client with GMAIL SMTP and PURE SMTP

This post shows you small example of java mail client with gmail smtp and pure smtp server.

 package ia.demo.utils;  
 import ia.demo.exception.fault.EmptyRecipientException;  
 import java.util.Properties;  
 import javax.mail.AuthenticationFailedException;  
 import javax.mail.Authenticator;  
 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;  
 /**  
  * Mail sending class  
  *  
  * @author Erdenebayar  
  */  
 public class MailUtil {  
  /* GMAIL SMTP CONFIGURATION */  
  static String GMAIL_HOST = "smtp.gmail.com";  
  static String GMAIL_FROM = "yourmail@gmail.com";  
  static String GMAIL_PASS = "yourpass";  
  static String GMAIL_PORT = "587";  
  
/* PURE SMTP CONFIGURATION */  
  static final String SMTP_HOST_NAME = "mail.server.com";  
  static final String SMTP_AUTH_USER = "yourmail@server.com";  
  static final String SMTP_FROM_ADDRESS = "yourmail@server.com";  
  static final String SMTP_AUTH_PWD = "yourpass";  
 
public static void main(String[] aaa) throws MessagingException {  
   String emailMsgTxt = "Message from Java";  
   final String emailSubjectTxt = "You are receiving mail from Java system";  
   String[] to = {"recipient1@yahoo.com", "recipient2@outlook.com"};  
   sendMailWithGmail(to, emailMsgTxt, emailSubjectTxt);  
   sendMailWithSmtp(to, emailMsgTxt, emailSubjectTxt);  
  }

  /**  
   * Email configured with GMAIL SMTP server  
   *  
   * @param recipients - List of recipients mail address  
   * @param subjectText - Subject of mail  
   * @param bodyText - Body of mail  
   * @throws MessagingException  
   */
public static void sendMailWithGmail(String[] recipients, String subjectText, String bodyText) throws MessagingException {  
   if (recipients.length > 0) {  
    Properties props = System.getProperties();  
    props.put("mail.smtp.starttls.enable", "true"); // added this line  
    props.put("mail.smtp.host", GMAIL_HOST);  
    props.put("mail.smtp.user", GMAIL_FROM);  
    props.put("mail.smtp.password", GMAIL_PASS);  
    props.put("mail.smtp.port", GMAIL_PORT);  
    props.put("mail.smtp.auth", "true");  
    Session session = Session.getDefaultInstance(props, null);  
    MimeMessage message = new MimeMessage(session);  
    message.setFrom(new InternetAddress(GMAIL_FROM));  
    InternetAddress[] toAddress = new InternetAddress[recipients.length];  
    // To get the array of addresses  
    for (int i = 0; i < recipients.length; i++) { // changed from a while loop  
     toAddress[i] = new InternetAddress(recipients[i]);  
    }  
    System.out.println(Message.RecipientType.TO);  
    for (int i = 0; i < toAddress.length; i++) { // changed from a while loop  
     message.addRecipient(Message.RecipientType.TO, toAddress[i]);  
    }  
    message.setSubject(subjectText);  
    message.setText(bodyText);  
    Transport transport = session.getTransport("smtp");  
    transport.connect(GMAIL_HOST, GMAIL_FROM, GMAIL_PASS);  
    transport.sendMessage(message, message.getAllRecipients());  
    transport.close();  
   } else {  
    throw new EmptyRecipientException("There are no recipient");  
   }  
  }

  /**  
   * Email configured with PURE SMTP server  
   *  
   * @param recipients - List of recipients mail address  
   * @param subjectText - Subject of mail  
   * @param bodyText - Body of mail  
   * @throws MessagingException  
   * @throws AuthenticationFailedException  
   */  
  public static void sendMailWithSmtp(String recipients[], String subjectText, String bodyText) throws MessagingException, AuthenticationFailedException {  
   if (recipients.length > 0) {  
    boolean debug = false;  
    //Set the host smtp address  
    Properties props = new Properties();  
    props.put("mail.smtp.host", SMTP_HOST_NAME);  
    props.put("mail.smtp.auth", "true");  
    Authenticator auth = new SMTPAuthenticator();  
    Session session = Session.getDefaultInstance(props, auth);  
    session.setDebug(debug);  
    // create a message  
    Message msg = new MimeMessage(session);  
    // set the from and to address  
    InternetAddress addressFrom = new InternetAddress(SMTP_FROM_ADDRESS);  
    msg.setFrom(addressFrom);  
    InternetAddress[] addressTo = new InternetAddress[recipients.length];  
    for (int i = 0; i < recipients.length; i++) {  
     addressTo[i] = new InternetAddress(recipients[i]);  
    }  
    msg.setRecipients(Message.RecipientType.TO, addressTo);  
    // Setting the Subject and Content Type  
    msg.setSubject(subjectText);  
    msg.setContent(bodyText, "text/plain");  
    Transport.send(msg);  
   } else {  
    throw new EmptyRecipientException("There are no recipient");  
   }  
  }  
  private static class SMTPAuthenticator extends javax.mail.Authenticator {  
   @Override  
   public PasswordAuthentication getPasswordAuthentication() {  
    String username = SMTP_AUTH_USER;  
    String password = SMTP_AUTH_PWD;  
    return new PasswordAuthentication(username, password);  
   }  
  }  
 }  

Thank you,
Erdenebayar

Linkedin: http://www.linkedin.com/in/erdenebayare
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