For run this code you should download mail.jar
http://mirrors.ibiblio.org/pub/mirrors/maven/ant/jars/ant-javamail-1.6.jar
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
public class Main
{
public static void main (String args[]) throws Exception
{
String host = "mail.xyz.com"; //Host name should be some mail host name
String from = "sounak@xyz.com"; // form address
  String to = "sounak@xyz.com"; // to address
  String fileAttachment = "d:\\sqljdbc.jar"; // file path
// Get system properties
  Properties props = System.getProperties();
// Setup mail server
  props.put("mail.smtp.host", host);
// Get session
  Session session = Session.getInstance(props, null);
// Define message MimeMessage message = new MimeMessage(session); message.setFrom( new InternetAddress(from));
  message.addRecipient( Message.RecipientType.TO, new InternetAddress(to));
  message.setSubject( "Hello JavaMail Attachment");
// create the message part
  MimeBodyPart messageBodyPart = new MimeBodyPart();
//fill message
  messageBodyPart.setText("Hi");
  Multipart multipart = new MimeMultipart();
  multipart.addBodyPart(messageBodyPart);
// Part two is attachment
  messageBodyPart = new MimeBodyPart();
  DataSource source = new FileDataSource(fileAttachment);
  messageBodyPart.setDataHandler( new DataHandler(source));
  messageBodyPart.setFileName(fileAttachment);
  multipart.addBodyPart(messageBodyPart);
// Put parts in message
  message.setContent(multipart);
// Send the message
  Transport.send( message );
}
}