class AdminLoginInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {<FILL_FUNCTION_BODY>}

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}

        String requestServletPath = request.getServletPath();
        if (requestServletPath.startsWith("/admin") && null == request.getSession().getAttribute("loginUser")) {
            request.getSession().setAttribute("errorMsg", "请登陆");
            response.sendRedirect(request.getContextPath() + "/admin/login");
            return false;
        } else {
            request.getSession().removeAttribute("errorMsg");
            return true;
        }
    
<no_super_class>