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Posted to user@struts.apache.org by "Gundersen, Richard" <Ri...@london-scottish.com> on 2007/08/01 15:24:24 UTC
DownloadAction and a normal Forward
Hi
I'm using a DownloadAction to generate a PDF and return it the the
browser. If there is a problem generating the PDF however, I want to
redirect the user to a specific JSP.
What's the best way of doing this? At the moment I am using
protected StreamInfo getStreamInfo(ActionMapping mapping, ActionForm
form,
HttpServletRequest request,
HttpServletResponse response) {
...
...
...
if(problem)
servlet.getServletContext().getRequestDispatcher("/admin.do?doAction=alr
eadyPrinted").forward(request, response);
return null;
}
else {
return new ByteArrayStreamInfo(contentType, myPdfBytes);
}
}
This works, but I always get a NullPointer, because I'm returning null
to satisfy the method signature. The exception doesn't cause a problem
for the user though, because the forward has already happened by then
(and the user is happily viewing the JSP)
Is there a better way to do this though - perhaps with
ResourceStreamInfo instead?
Regards
Richard Gundersen
Java Developer
Email: richard.gundersen@london-scottish.com
Phone: 01618302398
Fax: 01618342536
London Scottish Bank plc
24 Mount Street
Manchester
M2 3LS
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Re: DownloadAction and a normal Forward
Posted by "Frank W. Zammetti" <fz...@omnytex.com>.
It's not the *right* answer, and I'm not sure it won't cause some other
exception anyway (in fact, I'd bet it would), but what if instead of
returning null you instead do:
return new ByteArrayStreamInfo(null, null);
?
Frank
--
Frank W. Zammetti
Founder and Chief Software Architect
Omnytex Technologies
http://www.omnytex.com
AIM/Yahoo: fzammetti
MSN: fzammetti@hotmail.com
Author of "Practical Ajax Projects With Java Technology"
(2006, Apress, ISBN 1-59059-695-1)
and "JavaScript, DOM Scripting and Ajax Projects"
(2007, Apress, ISBN 1-59059-816-4)
Java Web Parts - http://javawebparts.sourceforge.net
Supplying the wheel, so you don't have to reinvent it!
On Wed, August 1, 2007 9:24 am, Gundersen, Richard wrote:
> Hi
>
> I'm using a DownloadAction to generate a PDF and return it the the
> browser. If there is a problem generating the PDF however, I want to
> redirect the user to a specific JSP.
>
> What's the best way of doing this? At the moment I am using
>
>
> protected StreamInfo getStreamInfo(ActionMapping mapping, ActionForm
> form,
> HttpServletRequest request,
> HttpServletResponse response) {
> ...
> ...
> ...
> if(problem)
>
> servlet.getServletContext().getRequestDispatcher("/admin.do?doAction=alr
> eadyPrinted").forward(request, response);
> return null;
> }
> else {
> return new ByteArrayStreamInfo(contentType, myPdfBytes);
> }
> }
>
> This works, but I always get a NullPointer, because I'm returning null
> to satisfy the method signature. The exception doesn't cause a problem
> for the user though, because the forward has already happened by then
> (and the user is happily viewing the JSP)
>
> Is there a better way to do this though - perhaps with
> ResourceStreamInfo instead?
>
> Regards
>
> Richard Gundersen
> Java Developer
>
> Email: richard.gundersen@london-scottish.com
> Phone: 01618302398
> Fax: 01618342536
> London Scottish Bank plc
> 24 Mount Street
> Manchester
> M2 3LS
>
>
> *** Disclaimer ***
>
> This electronic communication is confidential and for the exclusive use of
> the addressee. It may contain private and confidential information. The
> information, attachments and opinions contained in this E-mail are those
> of its author only and do not necessarily represent those of London
> Scottish Bank PLC or any other members of the London Scottish Group.
>
> If you are not the intended addressee, you are prohibited from any
> disclosure, distribution or further copying or use of this communication
> or the information in it or taking any action in reliance on it. If you
> have received this communication in error please notify the Information
> Security Manager at ISM@London-Scottish.com as soon as possible and delete
> the message from all places in your computer where it is stored.
>
> We utilise virus scanning software but we cannot guarantee the security of
> electronic communications and you are advised to check any attachments for
> viruses. We do not accept liability for any loss resulting from any
> corruption or alteration of data or importation of any virus as a result
> of receiving this electronic communication.
>
> Replies to this E-mail may be monitored for operational or business
> reasons. London Scottish Bank PLC is regulated by the Financial Services
> Authority.
> ______________________________________________________________________
> This email has been scanned by the MessageLabs Email Security System.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
>
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