Yes. I was just wondering if it's an issue to move the location of the nocache
handler since I really need access to the ActionMapping which isn't populated
until a later step?
Here's what I have in struts-config.xml:
<action path="/DisplayPDF"
className="dep.common.struts.NoCacheActionMapping"
type="view.struts.actions.DisplayPDF_Action"
scope="request">
<set-property property="nocache" value="false" />
<exception type="java.lang.Exception"
handler="dep.exception.ExceptionHandler"
path="/PDF_Display_Error.do"
key="exception.LOG"
scope="request" />
</action>
...
<controller nocache="true" />
Web.xml points to the updated chain-config.xml which was extracted from the
struts-core jar via the chainConfig parameter.
The ActionMapping was taken right out of the book.
The revised command is similar to the book's code:
package dep.common.struts;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.chain.commands.AbstractRequestNoCache;
import org.apache.struts.chain.contexts.ActionContext;
import org.apache.struts.chain.contexts.ServletActionContext;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.config.ActionConfig;
/**
* <p>Check to see if the controller is configured to prevent caching, and if
* so, set the no cache HTTP response headers.</p>
*/
public class ConfigurableNoCache extends AbstractRequestNoCache {
// ------------------------------------------------------- Protected Methods
protected void requestNoCache(ActionContext context)
{
boolean nocache = true; // default to nocache
ActionConfig mapping = context.getActionConfig();
if (mapping != null ) {
if ( mapping instanceof NoCacheActionMapping ) {
NoCacheActionMapping customMapping = (NoCacheActionMapping)
mapping;
nocache = customMapping.isNocacheEnabled();
}
}
if ( nocache )
{ // Standard struts code follows...
ServletActionContext sacontext = (ServletActionContext) context;
HttpServletResponse response = sacontext.getResponse();
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache,no-store,max-age=0");
response.setDateHeader("Expires", 1);
}
} // requestNoCache
}
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Paul Benedict
Sent: Thursday, December 18, 2008 11:14 PM
To: Struts Users Mailing List
Subject: Re: S1: Nocache and SSL
Sounds like an interesting idea. Are you using <set-property> within the action
config to turn caching off only where you need it?
On Fri, Dec 5, 2008 at 9:13 AM, Givler, Eric <[email protected]> wrote:
> I'm using Struts 1.3.5.
>
> I've run into a snag lately that my struts-config.xml controller
> nocache setting is causing IE to not download/display a PDF from one
> of my actions (see http://support.microsoft.com/?kbid=323308). I
> thought I could selectively turn off the nocache attribute for the
> single action that displays the PDF (like recipe 3.18 in Struts
> Cookbook where they read an ActionMapping which sets a flag). The
> issue is that the recipe is for earlier versions of Struts without the
> ComposableRequestProcessor.
>
> I modified my code to create a command ConfigurableNoCache to replace
> org.apache.struts.chain.commands.servlet.RequestNoCache. However, I
> needed to read the ActionMapping which contains the setting for this
> action (disabling the cache) and the nocache command appears prior to
> the lookup of the action config so the context.getActionConfig()
> returns null. If I want to put this in place, is there any issue
> modifying the chain-config like this (moving the nocache command):
>
> <!-- Set (if needed) no cache HTTP response headers -->
> <!-- <command
> className="org.apache.struts.chain.commands.servlet.RequestNoCache"/>
> -->
>
>
> <!-- Set (if needed) the HTTP response content type -->
> <command
>
> className="org.apache.struts.chain.commands.servlet.SetContentType"/>
>
>
> <!-- Identify the ActionConfig for this request -->
> <command
>
> className="org.apache.struts.chain.commands.servlet.SelectAction"/>
>
> <!-- Need to check no-cache AFTER we have access to the ActionConfig! -->
> <command className="dep.common.struts.ConfigurableNoCache" />
>
>
> Thanks for any input/assistance on this matter. I really appreciate
> it!
>
> Eric Givler
>
>
>
>
>
>
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