How to create request object manually?

Question

Can i edit a servlet request at the front controller level and disptach it to real url?
I need the way(maybe a class) to edit the request parameters;
         request.getContextPath();
         request.getRequestURL();
         request.getPathInfo();
         request.getServletPath();i need the equvilance of these methods which are built to SET.
is it possible?
thank you

Answer 1

1) Write a subclass of the HttpServletRequestWrapper
class and overide your required methods.http://forum.java.sun.com/thread.jspa?threadID=682565&tstart=100
I have used the wrapper in that forum but this is just for to set some Parameter to the request. But there is no method like setServletPath on the wrapper class? it is still missing and i need an HELP plz about how to override ServletPath on the request object.
2)In the doFilter() method of your filter, call
chain.doFilter() method giving your wrapped request
object as an argument.I did it
  public void doFilter(ServletRequest req,ServletResponse res,FilterChain chain)throws IOException,ServletException {
       HttpServletRequest request = (HttpServletRequest) req;       
      HttpRequestWithModifiableParameters myReq= new HttpRequestWithModifiableParameters(request);
      request=(HttpServletRequest)myReq;
      HttpServletResponse response=(HttpServletResponse)res;
      chain.doFilter( request, response );
  }please help about just only how to override ServletPath on request object!!
thank you