springboot中基于springmvc的拦截器的实现

@Component
public class UserInterceptor implements HandlerInterceptor  {
    public UserInterceptor(){}
  //方法执行前执行。返回true会继续执行下去，返回false取消请求
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("我是一个拦截器！！");
        return true;
    }
  //方法执行后执行
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,  ModelAndView modelAndView) throws Exception {
    }
  //控制器执行完成后执行
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,  Exception ex) throws Exception {
    }
}

@Configuration//或者@SpringBootConfiguration
public class UserInterceptorConfig extends WebMvcConfigurerAdapter {//或者implements WebMvcConfigurer
    @Autowired
    private UserInterceptor userInterceptor;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //注册自定义拦截器，添加拦截路径和排除拦截路径
        registry.addInterceptor(userInterceptor).addPathPatterns("/**");
    }
}