前言

由于SpringBoot默認是以jar包的方式啟動嵌入式的Servlet容器來啟動SpringBoot的web應用，沒有web.xml文件。

注冊三大組件用以下方式

一、ServletRegistrationBean

//注冊三大組件 @Bean public ServletRegistrationBean myServlet(){ServletRegistrationBean registrationBean = new ServletRegistrationBean(new MyServlet(),"/myServlet");return registrationBean; }

二、FilterRegistrationBean

@Bean public FilterRegistrationBean myFilter(){FilterRegistrationBean registrationBean = new FilterRegistrationBean();registrationBean.setFilter(new MyFilter());registrationBean.setUrlPatterns(Arrays.asList("/hello","/myServlet"));return registrationBean; }

三、ServletListenerRegistrationBean

@Bean public ServletListenerRegistrationBean myListener(){ServletListenerRegistrationBean<MyListener> registrationBean = new ServletListenerRegistrationBean<>(new MyListener());return registrationBean; }

SpringBoot幫我們自動SpringMVC的時候，自動的注冊SpringMVC的前端控制器；DIspatcherServlet；

DispatcherServletAutoConfiguration中：

@Bean(name = DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME) @ConditionalOnBean(value = DispatcherServlet.class, name = DEFAULT_DISPATCHER_SERVLET_BEAN_NAME) public ServletRegistrationBean dispatcherServletRegistration(DispatcherServlet dispatcherServlet) {ServletRegistrationBean registration = new ServletRegistrationBean(dispatcherServlet, this.serverProperties.getServletMapping());//默認攔截： / 所有請求；包靜態資源，但是不攔截jsp請求； /*會攔截jsp//可以通過server.servletPath來修改SpringMVC前端控制器默認攔截的請求路徑registration.setName(DEFAULT_DISPATCHER_SERVLET_BEAN_NAME);registration.setLoadOnStartup(this.webMvcProperties.getServlet().getLoadOnStartup());if (this.multipartConfig != null) {registration.setMultipartConfig(this.multipartConfig);}return registration; }

學習內容來自尚硅谷

總結

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