To forestall double submits, and "back button" resubmits,
the framework can generate a token that is embedded in the form
and also kept in the session.
If the value of the tokens do not compare,
then we know that there has been a problem,
and that a form has been submitted twice or out of sequence.
may want to look at implementing default-interceptor-ref as a double-submit
guard e.g. user-submit
struts.xml:
<interceptors>
<interceptor name="authentication"=
class="mailreader2.AuthenticationInterceptor"/>
<interceptor name="token-session"
class="com.opensymphony.webwork.interceptor.TokenSessionStoreInterceptor"/>
<interceptor-stack name="user" >
<interceptor-ref name="authentication" />
<interceptor-ref name="defaultStack"/>
</interceptor-stack>
<interceptor-stack name="user-submit" >
<interceptor-ref name="tokenSession" />
<interceptor-ref name="user"/>
</interceptor-stack>
<default-interceptor-ref name="user-submit"/>
</interceptors>
<action name="Subscription_save" method="save" class="mailreader2.Subscription">
<interceptor-ref name="user-submit" />
</action>
you can d/l what you need from here
http://svn.apache.org/repos/asf/struts/struts2/trunk/apps/mailreader/src/main/webapp/tour.html
or you can d/l the entire struts2 distro and seek for tour.html (under
mailreader)
HTH
Martin
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> From: [email protected]
> To: [email protected]
> Subject: RE: stream result causing action to be called multiple times
> Date: Tue, 5 May 2009 08:40:43 -0500
>
>
> >> is multiple equal 2?
>
>
>
> It calls the action between 2 and 4 times, but usually 3. I was thinking an
> interceptor would somehow call the action multiple times but maybe that's not
> possible. I don't fully understand how interceptors call actions. etc yet :)
>
>
>
> I was testing on a Mac. OSX/Firefox. I will try testing on windows/IE.
>
>
>
> Thanks
>
>
>
> > Date: Tue, 5 May 2009 04:08:49 -0200
> > Subject: Re: stream result causing action to be called multiple times
> > From: [email protected]
> > To: [email protected]
> >
> > Hi Andy,
>
> > If so maybe the browser is doing it because it doesn't know everything
> > about this file - size comes to mind.
> > If i remember correctly some browsers will do that.
> >
> > best greetings,
> > Pawel Wielgus.
> >
> > 2009/5/4, Andy <[email protected]>:
> > >
> > > Hi, I have an action that returns a stream result type and for some reason
> > > my action is getting called multiple times:
> > >
> > > <result name="attachment" type="stream">
> > > <param name="contentType">${attachmentContentType}</param>
> > > <param name="contentDisposition">filename="${attachmentFileName}"</param>
> > > </result>
> > >
> > > This causes some inefficiency since the action is retrieving an image from
> > > the database on each call. IDeas?
> > >
> > > I am on 2.16 and using default interceptor stack.
> > >
> > > Thanks
> > >
> > > _________________________________________________________________
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> >
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