自定義攔截器 UserInterceptor：
public class UserInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("token");
        if(StringUtils.isEmpty(token)){
       ...
            return false;
        }
        return true;
    }
}

配置自定義攔截器：
@Configuration
public class WebConfiguration implements WebMvcConfigurer {
    @Bean
    private UserInterceptor userInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(userInterceptor)
             // 攔截的請求
                .addPathPatterns("/**")
             // 不用攔截的請求
                .excludePathPatterns("/login");
    }
}