Re: [displaytag-devel] Fix / hack for exports in an include

Dr. Tolga Yalcinkaya Mon, 29 Sep 2003 22:54:48 -0700

Is this (the filter) the only solution? This really breaks a very nice feature of the display taglib: no config needed! I don't have an answer but if we can get this done without the filter, I think it would be a much better solution.

Just my 2 cents!

Andy Pruitt wrote:

This shouldn't be hard to add this filter to the code base and then suggest adding the settings to web.xml when using Tiles.
The filter is also necessary anytime your JSP page is included in
another page; it looks like some/many (I'm using Jetty) containers will
not let an included page reset the content type, and you won't be able
to clear the already write()'d content.
Here are the files w/ displaytag packages. TableTag#writeExport should add
pageContext.getRequest().setAttribute(org.displaytag.util.ResponseOverri
deFilter.CONTENT_OVERRIDE_TYPE, pMimeType);
pageContext.getRequest().setAttribute(org.displaytag.util.ResponseOverri
deFilter.CONTENT_OVERRIDE_BODY, pExportString);
at line 867.
Thanks!

Matt

On Monday, September 29, 2003, at 10:17 AM, Andy Pruitt wrote:

Ok, here is a fix for the dreaded "no export in tiles or included jsps" problem.

This fix allows exports to work seamlessly, without

requiring the JSP

author to duplicate the table tag, although it does require

a filter
to be added to web.xml.

The trick is that I changed the writeExport() method of TableTag to write the output into the Request object instead of to the page. A filter then checks for overriding content, and if content is present the filter will dump the page response and substitute in the overriding content.

It's a hack, but it works.
Change display.tld:
 <tag>
   <name>table</name>
   <tagclass>com.backstopsolutions.web.TableTag</tagclass>

To your web.xml:
  <filter>
     <filter-name>ResponseOverrideFilter</filter-name>
<filter-class>com.backstopsolutions.web.ResponseOverrideFilter</
filter-c
lass>
  </filter>
  <filter-mapping>
     <filter-name>ResponseOverrideFilter</filter-name>
     <url-pattern>*.do</url-pattern>
  </filter-mapping>
  <filter-mapping>
     <filter-name>ResponseOverrideFilter</filter-name>
     <url-pattern>*.jsp</url-pattern>
  </filter-mapping>
---andy pruitt
<TableTag.java><BufferedResponseWrapper.java><ResponseOverrideFilter.j

a va>

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Re: [displaytag-devel] Fix / hack for exports in an include

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