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Modifying Parameters with Filters  RSS feed

 
Drew Lane
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Posts: 296
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I've been playing around with Filters trying to intercept/modify some parameters that get sent in by an HTML Form.

I can get the parameter with request.getParameter(), but how do I set it?

I can use request.getSession().setAttribute(), but I don't think this is the same thing.

I'm guessing I need to modify the request before calling doFilter().

Any help?

Thanks,

Drew
 
William Brogden
Author and all-around good cowpoke
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You can't modify request parameters - what you have to do is make a custom HttpServletRequestWrapper extension. In your custom getParameter() and related methods, provide for catching the name of the parameter you want to "modify"
In the filter, replace the original request with the wrapped request.
Bill
 
It is sorta covered in the JavaRanch Style Guide.
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