@SpringBootApplication
@ServletComponentScan
public class MySpringbootApplication {
  public static void main(String[] args) {
   SpringApplication.run(MySpringbootApplication.class, args);
  }
}

@WebServlet(urlPatterns = "/serv")
public class MyServlet extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response) {
    System.out.println("------------doget-------------");
    doPost(request, response);
  }
  @Override
  protected void doPost(HttpServletRequest request, HttpServletResponse response) {
    System.out.println("------------dopost-------------");
  }
}

@WebServlet(urlPatterns = "/serv")

@WebFilter(filterName = "myFilter", urlPatterns = "/*")
public class MyFilter implements Filter {
  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
    System.out.println("初始化过滤器");
  }
  @Override
  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    System.out.println("执行过滤器");
    filterChain.doFilter(servletRequest, servletResponse);
  }
  @Override
  public void destroy() {
    System.out.println("销毁过滤器！");
  }
}

@WebFilter(filterName = "myFilter", urlPatterns = "/*")

@WebListener
public class MyHttpSessionListener implements HttpSessionListener {
  @Override
  public void sessionCreated(HttpSessionEvent httpSessionEvent) {
    System.out.println("session 被创建");
  }
  @Override
  public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
    System.out.println("session 被摧毁");
  }
}

public class MyInterceptor implements HandlerInterceptor{
  @Override
  public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
    System.out.println(MyInterceptor.class.getName()+" : 在请求之前调用");
    return true;
  }
  @Override
  public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
    System.out.println(MyInterceptor.class.getName()+" :请求处理之后视图渲染之前使用");
  }
  @Override
  public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
    System.out.println(MyInterceptor.class.getName()+" :请视图渲染之后使用");
  }
}

@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 MyInterceptor()).addPathPatterns("/**");
    registry.addInterceptor(new MyInterceptor2()).addPathPatterns("/**");
    super.addInterceptors(registry);
  }
}