@Component

public class LoginInterceputer implements HandlerInterceptor {

    /**

     * 进入controller层之前拦截请求

     * @param httpServletRequest

     * @param httpServletResponse

     * @param o 为函数对象

     * @return

     * @throws Exception

     */

    @Override

    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {

        System.out.println(o);

        System.out.println("进入controller之前拦截");

        return true;

    }

    @Override

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

        System.out.println("--------------处理请求完成后视图渲染之前的处理操作---------------");

    }

    @Override

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

        System.out.println("---------------视图渲染之后的操作-------------------------0");

    }

}

@Configuration

public class WebConfig implements WebMvcConfigurer {

    @Autowired

    LoginInterceputer loginInterceputer;

    @Override

    public void addInterceptors(InterceptorRegistry registry) {

        // 自定义拦截器，添加拦截路径和排除拦截路径

        registry.addInterceptor(loginInterceputer).addPathPatterns(new String[]{"/**"}).excludePathPatterns(new String[]{"/login"});

    }

}