UserRequiredAnnotationInterceptor.java

public class UserRequiredAnnotationInterceptor extends HandlerInterceptorAdapter
{
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception
    {
        if (handler == null)
        {
            return true;
        }

        if (((HandlerMethod) handler).getMethodAnnotation(RequiredUser.class) != null)
        {
            final Object userkey = request.getSession().getAttribute(LoginFilter.CURRENT_LOGGED_USER_ATTRIBUTE);
            if (userkey == null)
            {
                response.sendRedirect(SiteMap.HOME_REDIRECT);
                return false;
            }
        }

        return true;
    }
}