Reading parameters from a Multipart Request

[kevin.conaway]

I'm using a Servlet filter to intercept incoming requests and process
them based on a request parameter. A problem arises when a
multipart/form request comes through, as there are no parameters in the
request. If I parse the multipart request using
CommonsMultipartRequestHandler (from Struts), I can access the
parameters just fine. When I forward the requet on from the filter,
the parameters are lost though. How can I read the parameters from a
multipart form but still preserve them in the Request?

Thanks