Sending Email through Gmail Server Using JavaServlets

import java.io.*;
import java.net.*;

import java.util.Properties;
import javax.mail.AuthenticationFailedException;
import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.servlet.*;
import javax.servlet.http.*;

public class SendEmail extends HttpServlet {

 protected void processRequest(HttpServletRequest request,
                                  HttpServletResponse response)
                   throws IOException, ServletException {

        final String err = "/error.jsp";
        //final String succ = "/success.jsp";

        String from = "abc@gmail.com"    // Sender Email-Id
        String to = "xyz@gmail.com"     // Receiver Email-Id

System.out.println("mail : "+to);
        String subject = "Subject";          //Your Subject.
        String message = "Message"    Your Message

        String login = "abc@gmail.com";        //Sender Mail_Id
        String password = "xyx"; //Sender Mail Password

        try {
            Properties props = new Properties();
            props.setProperty("mail.host", "smtp.gmail.com");
            props.setProperty("mail.smtp.port", "587");
            props.setProperty("mail.smtp.auth", "true");
            props.setProperty("mail.smtp.starttls.enable", "true");

            Authenticator auth = new SMTPAuthenticator(login, password);

            Session session = Session.getInstance(props,auth);

            MimeMessage msg = new MimeMessage(session);
            msg.setText(message);
            msg.setSubject(subject);
            msg.setFrom(new InternetAddress(from));
            msg.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            Transport.send(msg);

        } catch (AuthenticationFailedException ex) {
            request.setAttribute("ErrorMessage", "Authentication failed");

            RequestDispatcher dispatcher = request.getRequestDispatcher(err);
            dispatcher.forward(request, response);
            return;

        } catch (AddressException ex) {
            request.setAttribute("ErrorMessage", "Wrong email address");

            RequestDispatcher dispatcher = request.getRequestDispatcher(err);
            dispatcher.forward(request, response);
            return;
        } catch (MessagingException ex) {
           request.setAttribute("ErrorMessage", ex.getMessage());
       
            RequestDispatcher dispatcher = request.getRequestDispatcher(err);
            dispatcher.forward(request, response);
            return;
        }
            RequestDispatcher dispatcher = request.getRequestDispatcher("/success.jsp?email="+to);
            dispatcher.forward(request, response);
            return;
    }

    private class SMTPAuthenticator extends Authenticator {

        private PasswordAuthentication authentication;

        public SMTPAuthenticator(String login, String password) {
            authentication = new PasswordAuthentication(login, password);
        }

        protected PasswordAuthentication getPasswordAuthentication() {
            return authentication;
        }
    }

    protected void doPost(HttpServletRequest request,
                         HttpServletResponse response)
                   throws ServletException, IOException {
        processRequest(request, response);
    }

 
}

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