一、使用原生Servlet API(推薦)

@Slf4j @WebFilter(urlPatterns={"/css/*","/images/*"}) //my public class MyFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {log.info("MyFilter初始化完成");}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {log.info("MyFilter工作");chain.doFilter(request,response);}@Overridepublic void destroy() {log.info("MyFilter銷毀");} } ------------------------------------------------------------------------------- @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 MySwervletContextListener implements ServletContextListener {@Overridepublic void contextInitialized(ServletContextEvent sce) {log.info("MySwervletContextListener監聽到項目初始化完成");}@Overridepublic void contextDestroyed(ServletContextEvent sce) {log.info("MySwervletContextListener監聽到項目銷毀");} }

利用@ServletComponentScan掃描進來

@MapperScan("com.aa.admin.mapper") @ServletComponentScan(basePackages = "com.aa.admin") @SpringBootApplication(exclude = RedisAutoConfiguration.class) public class Boot05WebAdminApplication {public static void main(String[] args) {SpringApplication.run(Boot05WebAdminApplication.class, args);} }

二、使用RegistrationBean

ServletRegistrationBean, FilterRegistrationBean, and ServletListenerRegistrationBean

@Configuration public class MyRegistConfig {@Beanpublic ServletRegistrationBean myServlet(){MyServlet myServlet = new MyServlet();return new ServletRegistrationBean(myServlet,"/my","/my02");}@Beanpublic FilterRegistrationBean myFilter(){MyFilter myFilter = new MyFilter(); // return new FilterRegistrationBean(myFilter,myServlet());FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(myFilter);filterRegistrationBean.setUrlPatterns(Arrays.asList("/my","/css/*"));return filterRegistrationBean;}@Beanpublic ServletListenerRegistrationBean myListener(){MySwervletContextListener mySwervletContextListener = new MySwervletContextListener();return new ServletListenerRegistrationBean(mySwervletContextListener);} }

三、擴展：DispatchServlet 如何注冊進來

容器中自動配置了 DispatcherServlet 屬性綁定到 WebMvcProperties；對應的配置文件配置項是 spring.mvc。

@Configuration(proxyBeanMethods = false)@Conditional({DispatcherServletAutoConfiguration.DispatcherServletRegistrationCondition.class})@ConditionalOnClass({ServletRegistration.class})@EnableConfigurationProperties({WebMvcProperties.class})@Import({DispatcherServletAutoConfiguration.DispatcherServletConfiguration.class})protected static class DispatcherServletRegistrationConfiguration {protected DispatcherServletRegistrationConfiguration() {}@Bean(name = {"dispatcherServletRegistration"})@ConditionalOnBean(value = {DispatcherServlet.class},name = {"dispatcherServlet"})public DispatcherServletRegistrationBean dispatcherServletRegistration(DispatcherServlet dispatcherServlet, WebMvcProperties webMvcProperties, ObjectProvider<MultipartConfigElement> multipartConfig) {DispatcherServletRegistrationBean registration = new DispatcherServletRegistrationBean(dispatcherServlet, webMvcProperties.getServlet().getPath());registration.setName("dispatcherServlet");registration.setLoadOnStartup(webMvcProperties.getServlet().getLoadOnStartup());multipartConfig.ifAvailable(registration::setMultipartConfig);return registration;}}

通過 ServletRegistrationBean 把 DispatcherServlet 配置進來。

springboot默認映射的是 / 路徑。

Tomcat-Servlet；
多個Servlet都能處理到同一層路徑，精確優選原則
A： /my/
B： /my/1

如果訪問 /my/1 那么由B處理，如果訪問/my/2，那么由A處理

總結

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