Not difficult, please see JavaMail send the attachment example

Here are the code to send an attachment:

Import java.util.Properties;
Import javax.mail.*;
Import javax.mail.internet.*;
Import javax.activation.*;

public class Attachexample {
public static void Main (String args[])
Throws Exception {
String host = Args[0];
String from = args[1];
String to = args[2];
String fileattachment = args[3];

Get System Properties
Properties props = System.getproperties ();

Setup Mail Server
Props.put ("Mail.smtp.host", host);

Get sessions
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.setcontent (multipart);

Send the message
Transport.send (message);
}
}