在SpringBoot中是不需要配置web.xml的，那么原来在web.xml中配置的Servlet、Filter、Listener现在怎么弄呢？
SpringBoot提供了三种Bean FilterRegistrationBean、ServletRegistrationBean、ServletListenerRegistrationBean
分别对应配置原生的Filter、Servlet、Listener。
@Bean
public ServletRegistrationBean indexServletRegistration() {
ServletRegistrationBean registration = new ServletRegistrationBean(new IndexServlet());
registration.addUrlMappings("/hello");
return registration;
}
@Bean
public FilterRegistrationBean indexFilterRegistration() {
FilterRegistrationBean registration = new FilterRegistrationBean(new IndexFilter());
registration.addUrlPatterns("/");
return registration;
}
@Bean
public ServletListenerRegistrationBean servletListenerRegistrationBean(){
ServletListenerRegistrationBean servletListenerRegistrationBean = new ServletListenerRegistrationBean();
servletListenerRegistrationBean.setListener(new IndexListener());
return servletListenerRegistrationBean;
}
SpringBoot之Servlet、Filter、Listener配置
原文：https://www.cnblogs.com/xiangkejin/p/9059930.html