How to attach multiple files to an email using JavaMail?

Well, it's been a while since I've done JavaMail work, but it looks like you could just repeat this code multiple times:

DataSource source = new FileDataSource(filename);messageBodyPart.setDataHandler(new DataHandler(source));messageBodyPart.setFileName(filename);multipart.addBodyPart(messageBodyPart);

For example, you could write a method to do it:

private static void addAttachment(Multipart multipart, String filename){    DataSource source = new FileDataSource(filename);    BodyPart messageBodyPart = new MimeBodyPart();            messageBodyPart.setDataHandler(new DataHandler(source));    messageBodyPart.setFileName(filename);    multipart.addBodyPart(messageBodyPart);}

Then from your main code, just call:

addAttachment(multipart, "file1.txt");addAttachment(multipart, "file2.txt");

etc

UPDATE (March 2020)

With the latest JavaMail™ API (version 1.6 at the moment, JSR 919), things are much simpler:

• void attachFile(File file)
• void attachFile(File file, String contentType, String encoding)
• void attachFile(String file)
• void attachFile(String file, String contentType, String encoding)

Useful reading

Here is a nice and to the point tutorial with the complete example:

• JavaMail - How to send e-mail with attachments

    Multipart mp = new MimeMultipart();        MimeBodyPart mbp1 = new MimeBodyPart();        mbp1.setContent(body,"text/html");        mp.addBodyPart(mbp1);        if(filename!=null)        {            MimeBodyPart mbp2 = null;            FileDataSource fds =null;            for(int counter=0;counter<filename.length;counter++)            {                mbp2 = null;                fds =null;                mbp2=new MimeBodyPart();                fds = new FileDataSource(filename[counter]);                mbp2.setDataHandler(new DataHandler(fds));                mbp2.setFileName(fds.getName());                mp.addBodyPart(mbp2);            }        }        msg.setContent(mp);        msg.setSentDate(new Date());        Transport.send(msg);