Seam makes it easy to attach files to an email. It supports most of the standard java types used when working with files.

If you wanted to email the jboss-seam-mail.jar:

<m:attachment value="/WEB-INF/lib/jboss-seam-mail.jar"/>

Seam will load the file from the classpath, and attach it to the email. By default it would be attached as jboss-seam-mail.jar; if you wanted it to have another name you would just add the fileName attribute:

<m:attachment value="/WEB-INF/lib/jboss-seam-mail.jar" fileName="this-is-so-cool.jar"/>

You could also attach a java.io.File, a java.net.URL:

<m:attachment value="#{numbers}"/>

Or a byte[] or a java.io.InputStream:

<m:attachment value="#{person.photo}" contentType="image/png"/>

You'll notice that for a byte[] and a java.io.InputStream you need to specify the MIME type of the attachment (as that information is not carried as part of the file).

And it gets even better, you can attach a Seam generated PDF, or any standard JSF view, just by wrapping a <m:attachment> around the normal tags you would use:

<m:attachment fileName="tiny.pdf">
    <p:document>                                                      
        A very tiny PDF                                                                                                
    </p:document>
</m:attachment>

If you had a set of files you wanted to attach (for example a set of pictures loaded from a database) you can just use a <ui:repeat>:

<ui:repeat value="#{people}" var="person">
    <m:attachment value="#{person.photo}" contentType="image/jpeg"
    fileName="#{person.firstname}_#{person.lastname}.jpg"/>
</ui:repeat>