Thread: RequestDispatcher forward and attribute / variable saving

Hi
I am begginer with java ee(servlets,jsp etc.).
I am writting simple Web Application with login service.
I have override method

doPost(HttpRequest request,HttpResposne response)

My idea is check valid of username and if is valid then send this with requestDispatcher forward:

            if(signInButton!=null){
			String communicat=null;
			username=loginAuthorization(request);
			if(username.equals("bad")==false)
			{
				Album album=new Album();
				url=base+studioAlbumsPollVote;
			}
			else{
				communicat="error login or password";
			}
			request.setAttribute( "communicat",  communicat);
		}
               ... 
              RequestDispatcher requestDispatcher=request.getRequestDispatcher(url);
		requestDispatcher.forward(request, response);

I was trying to use HttpSession setParametr and getParametr but after using forward method getParametr return null string. How can i pass username string for next doPost()?

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