Sending email through JavaMail API in Servlet

In this example we will see how to send email in Servlet application. JavaMail API that provides all classes require for sending an email. JavaMail API encapsulate two important package javax.mail and javax.mail.internet. These packages provides classes that can be used to send and receive simple emails. You simply need an Internet connection to send email using this simple Application.

• index.html will get the input from user
• MailApp.java servlet file will control the request and response. It will invoke send() of SendMail class that we have created to send the mail.
• SendMail.java, a java class that contains method to send mail.

index.html

<form action="mail" method="post">
 To:<input type="text" name="to"  /><br/>
 Subject:<input type="text" name="subject"  /><br/>
 Message:<input type="text" name="message"  /><br/>
 Your Email id:<input type="text" name="user" ><br/>
 Password<;input type="password" name="pass"   /><br/>
<input type="submit" value="send" />
 </form>

MailApp.java

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;


public class MailApp extends HttpServlet {

    
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        
        String to = request.getParameter("to");
        String subject = request.getParameter("subject");
        String message =  request.getParameter("message");
        String user = request.getParameter("user");
        String pass = request.getParameter("pass");
        SendMail.send(to,subject, message, user, pass);
        out.println("Mail send successfully");
        
    }   
}

SendMail.java

import java.io.*;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;


public class SendMail 
    
   {
    
    public static void send(String to, String sub, 
                         String msg, final String user,final String pass)
    {
     
     //create an instance of Properties Class     
     Properties props = new Properties();
     
     /* Specifies the IP address of your default mail server
     for e.g if you are using gmail server as an email sever
     you will pass smtp.gmail.com as value of mail.smtp host. As shown here in the 
    coding. Change accordingly, if your email id is not an gmail id*/
     props.put("mail.smtp.host", "smtp.gmail.com");
     
     props.put("mail.smtp.port", "587"); //this is optional 
     props.put("mail.smtp.auth", "true");
     props.put("mail.smtp.starttls.enable", "true");
     

     
     /*Pass Properties object(props) and Authenticator object   
           for authentication to Session instance */

    Session session = Session.getInstance(props,
                        new javax.mail.Authenticator() {
  protected PasswordAuthentication getPasswordAuthentication() {
   return new PasswordAuthentication(user,pass);
   }
});
    
 try
 {
 
 /* Create an instance of MimeMessage, 
 it accept MIME types and headers */
 
 MimeMessage message = new MimeMessage(session);
 message.setFrom(new InternetAddress(user));
 message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));
 message.setSubject(sub);
 message.setText(msg);

 /* Transport class is used to deliver the message to the recipients */
 Transport.send(message);
 
 
 }catch(Exception e)
 {
     e.printStackTrace();
 }
    }
    
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    
    <servlet>
        <servlet-name>mail</servlet-name>
        <servlet-class>MailApp</servlet-class>
    </servlet>
    
    <servlet-mapping>
        <servlet-name>mail</servlet-name>
        <url-pattern>/mail</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>
</web-app>

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