springboot拦截器的拦截与不拦截

//登陆拦截器
public class LoginInterceptor implements HandlerInterceptor {


    //访问controller之前被调用

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session=request.getSession();
        if(null!=session.getAttribute("admin"))
            return true;
        return false;
    }

    //访问controller之后 访问视图之前被调用

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {

    }

    //访问视图之后被调用

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {

    }
}

拦截器配置类
@Configuration
public class MyWebAppConfigurer extends WebMvcConfigurerAdapter {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 多个拦截器组成一个拦截器链
        // addPathPatterns 用于添加拦截规则
        // excludePathPatterns 用户排除拦截

        registry.addInterceptor(new LoginInterceptor())                   //添加拦截器
                               .addPathPatterns("/**")                    //拦截所有请求            
                               .excludePathPatterns("/","/admin_login","/login");    //对应的不拦截的请求

        super.addInterceptors(registry);
    }
}

参考：https://blog.youkuaiyun.com/catoop/article/details/50501696