Re: Using FileUpload to send an e-mail with attachment with JavaMail

[Tony Yat-Tung Cheung]

Hi Martin Cooper,

Thanks. It works perfectly.

The only minor issue is that I have to put MyDefaultFileItem in the same 
package as the DefaultFileItem, since the only constructor for 
DefaultFileItem has a package scope.

Thanks again.

Tony Cheung

Martin Cooper wrote:

On Thu, 26 Feb 2004, Tony Yat-Tung Cheung wrote:

 

Hi,

I am trying to make a servlet to receive a file with FileUpload, and
then send out an e-mail with the received file as an attachment.
The FileItem does not provide a way to get a DataSource out of it, which
is required by the JavaMail's MimeBodyPart.
Is there any way?

The FileItem's API documentations seem to hint the solution, but I do
not quite get the idea.
"While this interface does not extend javax.activation.DataSource per se
(to avoid a seldom used dependency), several of the defined methods are
specifically defined with the same signatures as methods in that
interface. This allows an implementation of this interface to also
implement javax.activation.DataSource with minimal additional work."
Do we have an easy solution here? I think it is one of the common
applications of the commons-fileupload.
   

I disagree that it's common, especially given that you're the first to
ask, but it is simple to accomplish. ;-)
First, you'll want a class that implements DataSource. Just add it to
DefaultFileItem:
public class MyDefaultFileItem extends DefaultFileItem
                              implements DataSource {
   // Add any DataSource methods that DefaultFileItem doesn't
   // already implement
}
Now you need to get FileUpload to use this new class. That means you need
a factory:
public class MyDefaultFileItemFactory extends DefaultFileItemFactory {
   public FileItem createItem(...) {
       // Basically, just copy the one from the base class, but make
       // it instantiate your new class, above, instead of the default.
   }
}
You're almost done. Now all you need to do is construct your FileUpload
class and specify your own factory:
   DiskFileUpload upload = new DiskFileUpload(
           new MyDefaultFileItemFactory());
That's it. Now the file items you get back from FileUpload will be of your
own class, and so implement DataSource.
--
Martin Cooper
 

Thank you very much.

Best Regards,
Tony Cheung
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