1、使用Servlet API

@ServletComponentScan(basePackages = “com.atguigu.admin”)
:指定原生Servlet組件都放在那里
@WebServlet(urlPatterns ="/my")：效果：直接響應，沒有經過Spring的攔截器？
@WebFilter(urlPatterns={"/css/","/images/"})
@WebListener

@ServletComponentScan(basePackages = "com.atguigu.admin") @SpringBootApplication(exclude = DataSourceAutoConfiguration.class)public class Boot05WebAdminApplication {public static void main(String[] args) {SpringApplication.run(Boot05WebAdminApplication.class, args);}} @WebServlet(urlPatterns = "/my") public class MyServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {resp.getWriter().write("66666");} } @Slf4j @WebFilter(urlPatterns = {"/css/*","/images/*"}) public class MyFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {log.info("init finished");}@Overridepublic void destroy() {log.info("destroy finished");}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {log.info("myFilter work");filterChain.doFilter(servletRequest,servletResponse);} } @Slf4j @WebListener public class MyServletContextListener implements ServletContextListener {@Overridepublic void contextInitialized(ServletContextEvent sce) {log.info("MyServletContextListener init finished");}@Overridepublic void contextDestroyed(ServletContextEvent sce) {log.info("MyServletContextListener destory finished");}}

2、使用RegistrationBean

@Slf4j //@WebFilter(urlPatterns = {"/css/*","/images/*"}) public class MyFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {log.info("init finished");}@Overridepublic void destroy() {log.info("destroy finished");}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {log.info("myFilter work");filterChain.doFilter(servletRequest,servletResponse);} }//=======================================================//@WebServlet(urlPatterns = "/my") public class MyServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {resp.getWriter().write("66666");}}//=================================================================@Slf4j //@WebListener public class MyServletContextListener implements ServletContextListener {@Overridepublic void contextInitialized(ServletContextEvent sce) {log.info("MyServletContextListener init finished");}@Overridepublic void contextDestroyed(ServletContextEvent sce) {log.info("MyServletContextListener destory finished");}} @Configuration(proxyBeanMethods = true) public class MyRegistConfig {@Beanpublic ServletRegistrationBean myServlet(){MyServlet myServlet = new MyServlet();return new ServletRegistrationBean(myServlet,"/my","/my02");}@Beanpublic FilterRegistrationBean myFilter(){MyFilter myFilter = new MyFilter();// 方式一: // return new FilterRegistrationBean(myFilter,myServlet());//方式二:FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(myFilter);filterRegistrationBean.setUrlPatterns(Arrays.asList("/my","/css/*"));return filterRegistrationBean;}@Beanpublic ServletListenerRegistrationBean myListener(){MyServletContextListener myServletContextListener = new MyServletContextListener();return new ServletListenerRegistrationBean(myServletContextListener);}}

注意:

@Configuration(proxyBeanMethods = true)

保證依賴的組件始終是單實例的

如果我們寫成

@Configuration(proxyBeanMethods = false)

說明我們當前類，每次調用一次myServlet方法，就會創建一個新的MyServlet，有可能導致我們一調用下面的過濾器方法就會創建一個新的MyServlet，會導致我們容器中有很多冗余的其他對象！

return new FilterRegistrationBean(myFilter,myServlet());

總結

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