lesson-4 Spring Boot Web篇下

小马哥,Java微服务实践SpringBootWeb篇（下）,Java微服务实战系列课堂,Java微服务实战系列课堂,课堂资源,特别说明,课堂微调课堂评分下期预告,议题,传统Servlet回顾ServletonSpringBootJSPonSpringBoot问答互动,传统Servlet回顾,什么是Servlet？Servlet是一种基于Java技术的Web组件，用于生成动态内容，由容器管理。类似于其他Java技术组件，Servlet是平台无关的Java类组成，并且由JavaWeb服务器加载执行。什么是Servlet容器？Servlet容器，有时候也称作为Servlet引擎，作为Web服务器或应用服务器的一部分。通过请求和响应对话，提供Web客户端与Servlets交互的能力。容器管理Servlets实例以及它们的生命周期。历史1997年六月，Servlet1.0版本发行，最新版本Servlet4.0处于研发状态。,核心接口,Servlet3.0前时代服务组件javax.servlet.Servletjavax.servlet.Filter（sinceServlet2.3）上下文组件javax.servlet.ServletContextjavax.servlet.http.HttpSessionjavax.servlet.http.HttpServletRequestjavax.servlet.http.HttpServletResponsejavax.servlet.http.Cookie（客户端）,核心接口,Servlet3.0前时代配置javax.servlet.ServletConfigjavax.servlet.FilterConfig（sinceServlet2.3）输入输出javax.servlet.ServletInputStreamjavax.servlet.ServletOutputStream异常javax.servlet.ServletException,核心接口,Servlet3.0前时代事件（sinceServlet2.3）生命周期类型javax.servlet.ServletContextEventjavax.servlet.http.HttpSessionEventjava.servlet.ServletRequestEvent属性上下文类型javax.servlet.ServletContextAttributeEventjavax.servlet.http.HttpSessionBindingEventjavax.servlet.ServletRequestAttributeEvent,核心接口,Servlet3.0前时代监听器（sinceServlet2.3）生命周期类型javax.servlet.ServletContextListenerjavax.servlet.http.HttpSessionListenerjavax.servlet.http.HttpSessionActivationListenerjavax.servlet.ServletRequestListener属性上下文类型javax.servlet.ServletContextAttributeListenerjavax.servlet.http.HttpSessionAttributeListenerjavax.servlet.http.HttpSessionBindingListenerjavax.servlet.ServletRequestAttributeListener,核心接口,Servlet3.0后时代组件申明注解javax.servlet.annotation.WebServletjavax.servlet.annotation.WebFilterjavax.servlet.annotation.WebListenerjavax.servlet.annotation.ServletSecurityjavax.servlet.annotation.HttpMethodConstraintjavax.servlet.annotation.HttpConstraint配置申明javax.servlet.annotation.WebInitParam,核心接口,Servlet3.0后时代上下文javax.servlet.AsyncContext事件javax.servlet.AsyncEvent监听器javax.servlet.AsyncListener,核心接口,Servlet3.0后时代Servlet组件注册javax.servlet.ServletContext#addServlet()javax.servlet.ServletRegistrationFilter组件注册javax.servlet.ServletContext#addFilter()javax.servlet.FilterRegistration监听器注册javax.servlet.ServletContext#addListener()javax.servlet.AsyncListener,核心接口,Servlet3.0后时代自动装配初始器javax.servlet.ServletContainerInitializer类型过滤javax.servlet.annotation.HandlesTypes,生命周期,Servlet生命周期初始化当容器启动或者第一次执行时，Servlet#init(ServletConfig)方法被执行，初始化当前Servlet。处理请求当HTTP请求到达容器时，Servlet#service(ServletRequest,ServletResponse)方法被执行，来处理请求。销毁当容器关闭时，容器将会调用Servlet#destroy方法被执行，销毁当前Servlet。,生命周期,Filter生命周期初始化当容器启动时，Filter#init(FilterConfig)方法被执行，初始化当前Filter。处理请求当HTTP请求到达容器时，Filter#doFilter(ServletRequest,ServletResponse,FilterChain)方法被执行，来拦截请求，在Servlet#service(ServletRequest,ServletResponse)方法调用前执行。销毁当容器关闭时，容器将会调用Filter#destroy方法被执行，销毁当前Filter。,ServletonSpringBoot,Servlet组件扫描注解方式注册ServletFilter监听器SpringBootAPI方式注册ServletFilter监听器,Servlet组件扫描,org.springframework.boot.web.servlet.ServletComponentScan指定包路径扫描Stringvalue()defaultStringbasePackages()default指定类扫描ClassbasePackageClasses()default,注解方式注册,Servlet组件扩展javax.servlet.Servletjavax.servlet.http.HttpServletorg.springframework.web.servlet.FrameworkServlet标记javax.servlet.annotation.WebServlet,注解方式注册,Filter组件实现javax.servlet.Filterorg.springframework.web.filter.OncePerRequestFilter标记javax.servlet.annotation.WebFilter,注解方式注册,监听器组件实现Listener接口javax.servlet.ServletContextListenerjavax.servlet.http.HttpSessionListenerjavax.servlet.http.HttpSessionActivationListenerjavax.servlet.ServletRequestListenerjavax.servlet.ServletContextAttributeListenerjavax.servlet.http.HttpSessionAttributeListenerjavax.servlet.http.HttpSessionBindingListenerjavax.servlet.ServletRequestAttributeListener标记javax.servlet.annotation.WebListener,SpringBootAPI方式注册,Servlet组件扩展javax.servlet.Servletjavax.servlet.http.HttpServletorg.springframework.web.servlet.FrameworkServlet组装ServletSpringBoot1.4.0开始支持org.springframework.boot.web.servlet.ServletRegistrationBeanSpringBoot1.4.0之前org.springframework.boot.context.embedded.ServletRegistrationBean暴露SpringBeanBean,SpringBootAPI方式注册,Filter组件实现javax.servlet.Filterorg.springframework.web.filter.OncePerRequestFilter组装FilterSpringBoot1.4.0开始org.springframework.boot.web.servlet.FilterRegistrationBeanSpringBoot1.4.0之前org.springframework.boot.context.embedded.FilterRegistrationBean暴露SpringBeanBean,SpringBootAPI方式注册,监听器组件实现Listener组装ListenerSpringBoot1.4.0开始org.springframework.boot.web.servlet.ServletListenerRegistrationBeanSpringBoot1.4.0之前org.springframework.boot.context.embedded.ServletListenerRegistrationBean暴露SpringBeanBean,JSPonSpringBoot,激活激活传统ServletWeb部署SpringBoot1.4.0开始org.