如何在不使用web.xml的情况下以编程方式配置

import javax.servlet.*;
import javax.servlet.annotation.*;

@HandlesTypes({MyInterface.class})
public class MyServletContainerInitializer implements ServletContainerInitializer {

    @Override
    public void onStartup(Set<Class<?>> c, ServletContext ctx) throws ServletException {
        // 注册Servlet
        ServletRegistration.Dynamic servlet = ctx.addServlet("myServlet", MyServlet.class);
        servlet.addMapping("/myservlet");

        // 注册Filter
        FilterRegistration.Dynamic filter = ctx.addFilter("myFilter", MyFilter.class);
        filter.addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST), true, "/*");

        // 注册Listener
        ctx.addListener(MyListener.class);
    }
}

@WebServlet(urlPatterns = "/myservlet")
public class MyServlet extends HttpServlet {
    // Servlet代码
}

@WebFilter(urlPatterns = "/*")
public class MyFilter implements Filter {
    // Filter代码
}

@WebListener
public class MyListener implements ServletContextListener {
    // Listener代码
}