Code to attache file in email code and sent to email address:



import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;
import java.util.Properties;
import java.util.Scanner;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.io.IOUtils;
import org.apache.tomcat.util.http.fileupload.FileItemIterator;
import org.apache.tomcat.util.http.fileupload.FileItemStream;
import org.apache.tomcat.util.http.fileupload.servlet.ServletFileUpload;

/**
 * @author Administrator
 * Class to email notification for advertisement form with attachment of file
 */
public class Email {

public static void main(String[] args) throws IOException {

final String username = "testmail@gmail.com";
final String password = "testpassword";

Properties props = new Properties();
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.auth", "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);
}
});

   
 //2) compose message    
 try{
   MimeMessage message = new MimeMessage(session);
   message.setFrom(new InternetAddress(username));
   message.addRecipient(Message.RecipientType.TO,new InternetAddress(username));
   message.setSubject("Message Aleart");
   
   //3) create MimeBodyPart object and set your message text    
   BodyPart messageBodyPart1 = new MimeBodyPart();
   messageBodyPart1.setText("This is message body");
   
   //4) create new MimeBodyPart object and set DataHandler object to this object    
   MimeBodyPart messageBodyPart2 = new MimeBodyPart();

   String filename = "C:\\test_doc.txt";//change accordingly
   DataSource source = new FileDataSource(filename);
   messageBodyPart2.setDataHandler(new DataHandler(source));
   messageBodyPart2.setFileName("a2.text");
   
   
   //5) create Multipart object and add MimeBodyPart objects to this object    
   Multipart multipart = new MimeMultipart();
   multipart.addBodyPart(messageBodyPart1);
   multipart.addBodyPart(messageBodyPart2);

   //6) set the multiplart object to the message object
   message.setContent(multipart );
   
   //7) send message
   Transport.send(message);
 
  System.out.println("message sent....");
  }catch (MessagingException ex) {
  ex.printStackTrace();
  }
}

public static void sendEmail(String content){
final String username = "testmail@gmail.com";
final String password = "testpassword";

Properties props = new Properties();
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.auth", "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(username));
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(username));
message.setSubject("Testing Subject");
message.setText(content);
// message.setContent(message, "charset=utf-8");
Transport.send(message);

System.out.println("Done");

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


public void sendEmail(HttpServletRequest request) {
final String username = "testmail@gmail.com";
final String password = "testpassword";

Properties props = new Properties();
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.auth", "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);
}
});


        String resultMessage = "";

        try {
        Message msg = new MimeMessage(session);
        if(!ServletFileUpload.isMultipartContent(request)) {
        return;
        }
            msg.setFrom(new InternetAddress(username));
            InternetAddress[] toAddresses = { new InternetAddress(username) };
            msg.setRecipients(Message.RecipientType.TO, toAddresses);
            msg.setSubject("Advertisement application form");
            msg.setSentDate(new Date());
            String contentDetail = "";
            MimeBodyPart messageBodyPart = new MimeBodyPart();
           
            // creates multi-part
            Multipart multipart = new MimeMultipart();
           
            // File upload option to get instance from mime type form data
            ServletFileUpload file = new ServletFileUpload();
            FileItemIterator iter = file.getItemIterator(request);
            while (iter.hasNext()) {
            FileItemStream item = iter.next();
            if (item.isFormField()) {
                    contentDetail += item.getFieldName() + " : "+new Scanner(item.openStream()).nextLine()+"
";

                } else{
                    //Code to attach the file
MimeBodyPart messageBodyPart2 = new MimeBodyPart();
InputStream input = item.openStream();
System.out.println("File name is:" + item.getName());
File tempFile = new File(item.getName());
OutputStream out = new FileOutputStream(tempFile);
out.write(IOUtils.toByteArray(input));
messageBodyPart2.attachFile(tempFile);
messageBodyPart2.setFileName(item.getName());
multipart.addBodyPart(messageBodyPart2);
                }
            }
            messageBodyPart.setContent(contentDetail, "text/html");
            multipart.addBodyPart(messageBodyPart);
            // sets the multi-part as e-mail's content
            msg.setContent(multipart);
            // sends the e-mail
            Transport.send(msg);
           
            resultMessage = "The e-mail was sent successfully";
            request.setAttribute("resultMessage", resultMessage);
        } catch (Exception ex) {
            ex.printStackTrace();
            resultMessage = "There were an error: " + ex.getMessage();
            request.setAttribute("resultMessage", resultMessage);
        }
}
}