Wrapper to query custom, then later... the tag jsp:param
Hi people,First of all: don't know if this question has to be asked under servlets or JSP because it slightly affects both... hope it's all right here
I have a Web application that I want to put a filter to manipulate the parameters received prior to their arrival in the application. My reasons to do so include a piece of third party software which I do not have permission to play with, so this approach (using the filter to the doctor the incoming parameters) is what I have to go with at the moment.
OK - so I've set up a filter. And then a custom requestWrapper that stretched javax.servlet.http.HttpServletRequestWrapper. I overrode getParameter() and getParameterMap(), getParameterNames() getParameterValues(). And everything went well. I was happy, my debugs showed the appropriate content and I went to plug the new filter in my application to test it.
Then, I hit a small stumbling block. A good number of the JSP in this application use jsp: include directive and then the jsp:param tag to pass information to the jsp included. Normally, when you read these values of jsp:param in an included jsp, you use request.getParameter (). But of course, request.getParameter () is now the method of my custom requestWrapper. He knows nothing about how the jsp:Param tag is magically inserting new parameters in the query.
If someone can tell me... How this happen? How can I change my wrapper to meet the parameters created by a JSP page using the jsp:param tag?
I am aware of an option at the moment - which is to review all these pages and remove the use of jsp:param and replace it with setAttribute()... but I'd have to do it! I have not seen any documentation on how works the jsp:param tag, and so how I would be able to substitute all it does...
flintdk wrote:
Hi Ram,Thanks again for the response... for the record (answering your comments on the Dispatcher) I made my debugs using both:
Filter test
FrontControllerActions
... and...
Filter test
*.do
INCLUDE
FORWARD
REQUEST
ERROR
... and got exactly the same results each time.
Hmmm... interesting. Here's what the Servlet specification has to say about this (section S.R.V.6.2.5 in spec 3.0). It's too long to post here, but here is an excerpt
+
+
+
+
would result in the filter of what logging by the demands of the customers from.
+ products... but not as a request dispatcher call where demand +
Dispatcher has the path starting products/...*.
Back to the original problem, I think it's a bug in tomcat. What version of tomcat, your application is running under? I went through all the source code for tomcat 6.x, and it looks clean to me. Because the version of the getParameter() in your Wrapper to alleviate the problem?
public String getParameter (String name) {}
String returnValue = null;
String [] params = getParameterValues (name);
If (paramArray! = null & paramArray.length > 0) {}
returnValue = params [0];
}
if(returnValue == null) {}
Return super.getParameter (name); Check if the param is there in the subject of the original application
}
}
see you soon,
RAM memory.
Tags: Java
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