package ru.skyb.scripts.global.MailNotice;

import java.util.Vector;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.mail.*;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMultipart;

import javax.activation.FileDataSource;

import bitel.billing.server.util.MailMsg;
import ru.bitel.bgbilling.kernel.script.server.dev.GlobalScriptBase;
import ru.bitel.bgbilling.server.util.Setup;
import ru.bitel.common.sql.ConnectionSet;

public class AttachmentFile
   extends GlobalScriptBase
{
   @Override
   public void execute( Setup setup1, ConnectionSet connectionSet2 )
      throws Exception
{
      MailMsg msg = new MailMsg( setup1 );
      MimeBodyPart htmlPart = new MimeBodyPart();
      Vector objects = new Vector();
      objects.addElement("mail@billing.com");
        // Create the message part
        BodyPart messageBodyPart = new MimeBodyPart();

        // Fill the message
        messageBodyPart.setText("hi");

        Multipart multipart = new MimeMultipart();
        multipart.addBodyPart(messageBodyPart);

        // Part two is attachment
        messageBodyPart = new MimeBodyPart();
        String fileAttachment = "file.txt";//file name for attachment
        DataSource source = new FileDataSource(fileAttachment);
        messageBodyPart.setDataHandler(new DataHandler(source));
        messageBodyPart.setFileName("billing.csv");
        multipart.addBodyPart(messageBodyPart);

        // Put parts in message
        htmlPart.setContent(multipart);

        // Send the message
        msg.sendMessage(objects, "subjeсt", multipart);   
         System.out.println("Msg Send ....") ;
   }

}

http://www.java2s.com/Code/JarDownload/javax/javax.activation.jar.zip