What is the correct way to implement login with redirect using JSF 2.0?

Part of my site should be accessible only to authorized users. Let's assume user would enter page a.html which belongs to the authorized-only part.

If I was to use servlets/JSP I could write a filter that checked whether user is logged in and if not - redirected him to login page. After a successful login user would be redirected to the page he wanted to reach initially, in this case a.html. (Page address could be开发者_C百科 stored in request).

What is a proper way to implement such scenario in JSF 2.0?

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Just do it the same way, with a Filter. It's good to know that JSF session scoped managed beans are under the covers stored as a HttpSession attribute with the managed bean name as key.

Assuming that you've a managed bean like this:

@ManagedBean
@SessionScoped 
public class UserManager {

    private User user;

    // ...

    public boolean isLoggedIn() {
        return (user != null);
    }

}

Then you can check it in Filter#doFilter() as follows:

UserManager userManager = (UserManager) ((HttpServletRequest) request).getSession().getAttribute("userManager");

if (userManager != null && userManager.isLoggedIn()) {
    chain.doFilter(request, response);
} else {
    ((HttpServletResponse) response).sendRedirect("login.xhtml");
}