Module 1...Adding email notification on registration

In my last blog (http://productdesignsagain.blogspot.in/2015/09/user-master-data-save-application.html) we made a registration page. Now we will add email notification feature. For this we need to modify 'com.users.controller' package from previous shown project structure:

UserController.java will have a slight modification, it will create object of mail.java on save:

package com.users.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.users.bean.UserBean;
import com.users.model.User;
import com.users.service.UserService;



@Controller
public class UserController {

 @Autowired
 private UserService userService;
 

 @RequestMapping(value = "/save", method = RequestMethod.POST)
 public ModelAndView saveUser( @ModelAttribute("user") UserBean u1, BindingResult result) {
  User u = prepareModel(u1);
  System.out.println("+++++++++++++"+u);
  userService.addUser(u);  

  mail m = new mail(u1.getEmail_id()); // create mail class object
  return new ModelAndView("save");

 }



 @RequestMapping(value = "/welcome", method = RequestMethod.GET)
 public ModelAndView welcome(@ModelAttribute("user") UserBean u1, BindingResult result) {

  System.out.println("1*****************");
  return new ModelAndView("welcome");
 }





 private User prepareModel(UserBean uBean){
  User u1 = new User();
  u1.setPassword(uBean.getPassword());
  u1.setEmail_id(uBean.getEmail_id());
  u1.setUser_id(uBean.getUser_id());
  uBean.setUser_id(null);
  return u1;
 }


}

Mail.java

--------------------------

package com.users.controller;

import java.util.Properties;
import java.util.regex.Pattern;

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;

import org.apache.xerces.impl.xs.identity.Selector.Matcher;

public class mail {
mail(String m)
{

System.out.println("in mail constructor");
boolean trueBinary = false;
final String username = "< SENDING SERVER ID";
 final String password = "SENDING SERVER PASSWORD";

 String patt = "@(([a-zA-Z0-9_/-/.]+))*.*.";

 Pattern pattern2 =Pattern.compile(patt);
 java.util.regex.Matcher mat = pattern2.matcher(m);
 int count = 0;
    while(mat.find()) {
    System.out.println("found gila bila: " + mat.group(0));
    if(mat.group(0).equals("@gmail.com"))
    {
    System.out.println("gmail");
    trueBinary = true;
   
    }
    else
    trueBinary = false;
    }
   
 if(trueBinary == true)
 {
 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("SENDING SERVER ID"));
     message.setRecipients(Message.RecipientType.TO,
         InternetAddress.parse(m));
     message.setSubject("Registration Complete");
     message.setText("Dear user you have successfully registered");

     Transport.send(message);

     System.out.println("Done");

 } catch (MessagingException e) {
     throw new RuntimeException(e);
 }


}
 else
 {
 String to = "sento@ta.com";//change accordingly
     String from = "sendfrom@lala.com";
     String host = "localhost";//or IP address

    //Get the session object
     Properties properties = System.getProperties();
     properties.setProperty("mail.smtp.host", host);
     Session session = Session.getDefaultInstance(properties);

    //compose the message
     try{
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress(from));
        message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));
        message.setSubject("Ping");
        message.setText("Hello, this is example of sending email  ");

        // Send message
        Transport.send(message);
        System.out.println("message sent successfully....");

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


}