1、编写一个配置类

@Configuration(proxyBeanMethods = true)
public class MyRegistConfig {
    @Bean
    public ServletRegistrationBean myServlet() {
        MyServlet myServlet = new MyServlet();
        return new ServletRegistrationBean(myServlet, "/my", "/my2");
    }
    @Bean
    public FilterRegistrationBean myFilter() {
        MyFilter myFilter = new MyFilter();
//        return new FilterRegistrationBean(myFilter, myServlet());
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(myFilter);
        filterRegistrationBean.setUrlPatterns(Arrays.asList("/my", "/css/*"));
        return filterRegistrationBean;
    }
    @Bean
    public ServletListenerRegistrationBean myListener() {
        MyServletContextListener myServletContextListener = new MyServletContextListener();
        return new ServletListenerRegistrationBean(myServletContextListener);
    }
}

2、Servlet

不需要加额外注解了，直接编写类本身即可。

public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("6666");
    }
}

3、Filter

除了 lombok 的 slf4j 用来打印日志以外，不需要加额外注解了，直接编写类本身即可。

@Slf4j
public class MyFilter implements Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        log.info("MyFilter工作");
        chain.doFilter(request, response);
    }
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.info("MyFilter初始化完成");
    }
    @Override
    public void destroy() {
        log.info("MyFilter销毁");
    }
}

4、Listener

除了 lombok 的 slf4j 用来打印日志以外，不需要加额外注解了，直接编写类本身即可。

@Slf4j
public class MyServletContextListener implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        log.info("MyServletContextListener 监听到项目初始化完成");
    }
    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        log.info("MyServletContextListener 监听到项目销毁");
    }
}

测试效果

访问：
http://127.0.0.1/css/bootstrap.min.css


可以看到，有在正常工作。

http://127.0.0.1/my

可以看到有在正常工作。

Listener 也有正常工作。