Spring MVC, how to have a controller handler handle all the requests before the mapped handlers?

I've wrote a web app with its brave controllers and handler mapping, everything with Spring 3.0 and controller annotations. Now turns out that I need simple and custom autentication.开发者_高级运维 I don't want to use ACEGI for the moment, because I've no time to learn it. I'd like ideally that I could have a routine that gets called before every mapped handler, gets from the HttpSession the userId, checks if he is logged in and the session key and if not redirects to a login page. I've been thinking about an interceptor... the problem is that you have to use HandlerInterceptorAdapter, which has the following method:

 public boolean preHandle(
            HttpServletRequest request,
            HttpServletResponse response,
            Object handler) throws Exception {

that won't let me access the HttpSession associated with the request. How do I solve this?

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Are you sure? You should be able to obtain the session through request.getSession().