@WebServlet(urlPatterns = "/testServlet")

  public class TestServlet extends HttpServlet {

   @Override

   public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {

      System.out.println("testServlet");

   }

}

@SpringBootApplication

@ServletComponentScan

  public class ServletApplication {

      public static void main(String[] args) {

      SpringApplication.run(ServletApplication.class,args);

   }

}

@WebFilter(urlPatterns = "/*")
public class TestFilter implements Filter {
   @Override
   public void init(FilterConfig filterConfig) throws ServletException {
      System.out.println("過濾器init........");
   }

   @Override
   public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
      System.out.println("過濾器過濾........");
      filterChain.doFilter(servletRequest,servletResponse);
   }

   @Override
   public void destroy() {
      System.out.println("destroy........");
   }
}

@WebListener

  public class TestListener implements ServletContextListener {

   @Override

   public void contextInitialized(ServletContextEvent servletContextEvent) {

      System.out.println("啟動了................");

   }

  

   @Override

   public void contextDestroyed(ServletContextEvent servletContextEvent) {

      System.out.println("關閉了................");

   }

}

@Bean

  public ServletRegistrationBean testServlet(){

   ServletRegistrationBean bean = new ServletRegistrationBean();

   bean.setServlet(new TestServlet());

   bean.addUrlMappings("/testServlet1");

   return bean;

}

@Bean

  public FilterRegistrationBean testFilter(){

   FilterRegistrationBean bean = new FilterRegistrationBean();

   bean.setFilter(new TestFilter());

   bean.addUrlPatterns("/*");

   return bean;

}

@Bean

  public ServletListenerRegistrationBean testListener(){

   ServletListenerRegistrationBean bean = new ServletListenerRegistrationBean();

   bean.setListener(new TestListener());

   return bean;

}