The <dotj:upload> tag can be used to provide file upload capabilities for your application. No need to
understand multipart formats and the complexities that come with it!
The tag is scriptable, so you can write code to obtain information on what happened during the
upload process. You can also cap the number of bytes that can be uploaded using the maxbytes attribute. In addition,
you can specifiy which MIME types you allow and which you'd like to deny.