How to hide the parameter values in url

I am working on a project using hibernate and Spring MVC architecture. My problem is that I am using (*.htm) url pattern in my web application , in this case when I sent a product's id to controller for editing, the product's id is shown in url for eg.

"localhost:8080/MyApp/editProduct.htm?productId=03". 

"localhost:8080/MyApp/editProduct.htm?productId" or "localhost:8080/MyApp/editProduct.htm/productId/03" 

and I am unable to use @PathVariable Annotation in my controller because of my url pattern(*.htm) and using of @PathVariable Annotation the JSP page never load properly. Any Suggestions . Thanks in Advance. Controller:-

@RequestMapping(value = "//deleteState.htm") public ModelAndView deleteState(@PathVariable("sId") int sId )< ModelAndView mav = new ModelAndView(); try< stateDAO.deleteById(sId); mav.addAllObjects(prepapareModel()); mav.addObject("msg", "State Deleted Succesdfully"); mav.setViewName("admin/viewState"); return mav; >catch(Exception e) < e.printStackTrace(); mav.addAllObjects(prepapareModel()); mav.addObject("err", "Failed to Delete State"); mav.setViewName("admin/viewState"); return mav; >> public Map prepapareModel()

http://localhost:8080/PujaInBox/10/deleteState.htm