Hi, You would think that such a common requirement (file upload) when it comes to web programming would be supported 'out of the box' ?
Just my two cents. Thanks, Stef ----- Original Message ----- From: "Hans Bergsten" <[EMAIL PROTECTED]> To: "Tag Libraries Users List" <[EMAIL PROTECTED]> Sent: Wednesday, November 06, 2002 11:41 PM Subject: Re: Tag for uploading > Stefan, > > > I just got your book on JSP, looks to be the best one on the market > > BTW. > > Ah, you're just saying that to get an answer ;-) Thanks anyway :-) > > > I have just skimmed through it and thought I saw something in > > there where you talk about file upload? Is that the case or am I > > missing something. > > The only thing I say about file upload in the book is pretty much what > I said here; I refer to Jason's article about filters. The reason is > that, like Martin said, file upload really has nothing to do with JSP. > It's better done using a filter or a servlet. > > Hans > > > ----- Original Message ----- > > From: "Hans Bergsten" <[EMAIL PROTECTED]> > > To: "Tag Libraries Users List" <[EMAIL PROTECTED]> > > Sent: Wednesday, November 06, 2002 11:30 PM > > Subject: Re: Tag for uploading > > > > > > > >>Martin Cooper wrote: > >> > >>>[...] > >>>The Struts <html:file> tag generates an HTML <input type="file"> > >> > > element, > > > >>>and doesn't actually handle the request. If the latter is what you are > >>>looking for, I'm not sure how feasible that really is in a JSP page. > >>> > >>>The issue is that parsing a multipart request consumes the input stream, > >> > > so > > > >>>you can only do that once. Some containers (e.g. Resin) have built-in > >>>multipart handling, and if that's enabled, it should provide all you > >> > > need. > > > >>>But your pages will have to "know" that the container did that, and have > >> > > to > > > >>>"know" how to access the uploaded files. That's not portable. > >>> > >>>If your container doesn't support multipart handling, or you've disabled > >> > > it, > > > >>>then you might be able to wrap a tag around a package such as Commons > >>>FileUpload: > >>> > >>>http://jakarta.apache.org/commons/fileupload/ > >>> > >>>The main issue with this is how you would access non-file parameter > >> > > values > > > >>>in the rest of the JSP page. Calls to request.getParameter() (either > >> > > direct > > > >>>or indirect, using tags) after parsing the multipart request will not > >> > > work, > > > >>>since FileUpload will have "stolen" the parameters. You'd have to obtain > >> > > the > > > >>>values directly from the FileUpload instance, since there is no way to > >> > > tell > > > >>>the container about the parameters (short of creating your own JSP page > >> > > base > > > >>>class and wrapping the request, but that's getting even more far > >> > > fetched! > > > >>>:). > >>> > >>>In short - use a servlet! :-) > >> > >>An alternative that solves some of the issues Martin describes is to > >>use a filter, like the file upload filter described in this article > >>by Jason Hunter: > >> > >> <http://www.javaworld.com/javaworld/jw-06-2001/jw-0622-filters-p4.html> > >> > >>Hans > >>-- > >>Hans Bergsten [EMAIL PROTECTED] > >>Gefion Software http://www.gefionsoftware.com > >>JavaServer Pages http://TheJSPBook.com > >> > >> > >>-- > >>To unsubscribe, e-mail: > > > > <mailto:taglibs-user-unsubscribe@;jakarta.apache.org> > > > >>For additional commands, e-mail: > > > > <mailto:taglibs-user-help@;jakarta.apache.org> > > > > > > > > -- > > To unsubscribe, e-mail: <mailto:taglibs-user-unsubscribe@;jakarta.apache.org> > > For additional commands, e-mail: <mailto:taglibs-user-help@;jakarta.apache.org> > > > > -- > Hans Bergsten [EMAIL PROTECTED] > Gefion Software http://www.gefionsoftware.com > JavaServer Pages http://TheJSPBook.com > > > -- > To unsubscribe, e-mail: <mailto:taglibs-user-unsubscribe@;jakarta.apache.org> > For additional commands, e-mail: <mailto:taglibs-user-help@;jakarta.apache.org> > -- To unsubscribe, e-mail: <mailto:taglibs-user-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:taglibs-user-help@;jakarta.apache.org>
