SpringBoot实现登陆拦截

@Component
public class LoginHandlerInterceptor implements HandlerInterceptor {

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

       //拦截逻辑

        Object user = request.getSession().getAttribute("loginUser");
        if (user == null) {
            System.out.println("没有权限请先登陆");
            //未登陆，返回登陆界面
            request.setAttribute("msg","没有权限请先登陆");
            request.getRequestDispatcher("/login").forward(request,response);
            return false;
        } else {
            //已登陆，放行请求
            return true;
        }
    }
}

@Configuration
public class MyWebMvcConfiguration implements WebMvcConfigurer {

    @Autowired
    LoginHandlerInterceptor loginHandlerInterceptor;

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("forward:/login");
        registry.setOrder(Ordered.HIGHEST_PRECEDENCE);
    }

    //注册拦截器
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //拦截所有的请求
        registry.addInterceptor(loginHandlerInterceptor).addPathPatterns("/**").excludePathPatterns("/login", "/register").excludePathPatterns("/static/**");
    }

}