（一）DispatcherServlet加入到Servlet里面


在spi里面有
C:\Users\Administrator.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.2.2.RELEASE\spring-boot-autoconfigure-2.2.2.RELEASE.jar!\META-INF\spring.factories

里面有个org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration,

  1. @AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)
  2. @Configuration(proxyBeanMethods = false)
  3. @ConditionalOnWebApplication(type = Type.SERVLET)
  4. @ConditionalOnClass(DispatcherServlet.class)
  5. @AutoConfigureAfter(ServletWebServerFactoryAutoConfiguration.class)
  6. public class DispatcherServletAutoConfiguration {
  8.       /*
  9.        * The bean name for a DispatcherServlet that will be mapped to the root URL "/"
  10.        */
  11.       public static final String DEFAULT_DISPATCHER_SERVLET_BEAN_NAME = "dispatcherServlet";
  13.       /*
  14.        * The bean name for a ServletRegistrationBean for the DispatcherServlet "/"
  15.        */
  16.       public static final String DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME = "dispatcherServletRegistration";
  18.       @Configuration(proxyBeanMethods = false)
  19.       @Conditional(DefaultDispatcherServletCondition.class)
  20.       @ConditionalOnClass(ServletRegistration.class)
  21.       @EnableConfigurationProperties({ HttpProperties.class, WebMvcProperties.class })//加载配置文件
  22.       protected static class DispatcherServletConfiguration {
  24.              @Bean(name = DEFAULT_DISPATCHER_SERVLET_BEAN_NAME)
  25.              public DispatcherServlet dispatcherServlet(HttpProperties httpProperties, WebMvcProperties webMvcProperties) {
  26.                     //创建对象
  27.                     DispatcherServlet dispatcherServlet = new DispatcherServlet();
  28.                     dispatcherServlet.setDispatchOptionsRequest(webMvcProperties.isDispatchOptionsRequest());
  29.                     dispatcherServlet.setDispatchTraceRequest(webMvcProperties.isDispatchTraceRequest());
  30.                     dispatcherServlet.setThrowExceptionIfNoHandlerFound(webMvcProperties.isThrowExceptionIfNoHandlerFound());
  31.                     dispatcherServlet.setPublishEvents(webMvcProperties.isPublishRequestHandledEvents());
  32.                     dispatcherServlet.setEnableLoggingRequestDetails(httpProperties.isLogRequestDetails());
  33.                     return dispatcherServlet;//加入到Spring容器里面
  34.              }
  36.              @Bean
  37.              @ConditionalOnBean(MultipartResolver.class)
  38.              @ConditionalOnMissingBean(name = DispatcherServlet.MULTIPART_RESOLVER_BEAN_NAME)
  39.              public MultipartResolver multipartResolver(MultipartResolver resolver) {
  40.                     // Detect if the user has created a MultipartResolver but named it incorrectly
  41.                     return resolver;
  42.              }
  44.       }
  46.       @Configuration(proxyBeanMethods = false)
  47.       @Conditional(DispatcherServletRegistrationCondition.class)
  48.       @ConditionalOnClass(ServletRegistration.class)
  49.       @EnableConfigurationProperties(WebMvcProperties.class)
  50.       @Import(DispatcherServletConfiguration.class)
  51.       protected static class DispatcherServletRegistrationConfiguration {
  53.              /**
  54.               * 加入到Servlet容器
  55.               */
  56.              @Bean(name = DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME)
  57.              @ConditionalOnBean(value = DispatcherServlet.class, name = DEFAULT_DISPATCHER_SERVLET_BEAN_NAME)
  58.              public DispatcherServletRegistrationBean dispatcherServletRegistration(DispatcherServlet dispatcherServlet,
  59.                            WebMvcProperties webMvcProperties, ObjectProvider<MultipartConfigElement> multipartConfig) {
  61.                     DispatcherServletRegistrationBean registration = new DispatcherServletRegistrationBean(dispatcherServlet,
  62.                                   webMvcProperties.getServlet().getPath());
  63.                     registration.setName(DEFAULT_DISPATCHER_SERVLET_BEAN_NAME);
  64.                     //配置加入方式,随着Tomcat启动而启动
  65.                     registration.setLoadOnStartup(webMvcProperties.getServlet().getLoadOnStartup());
  66.                     multipartConfig.ifAvailable(registration::setMultipartConfig);
  67.                     return registration;
  68.              }
  70.       }
  71. //...........
  72. }





（二）HandlerMapping和HandlerAdapter配置



在spi里面有
C:\Users\Administrator.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.2.2.RELEASE\spring-boot-autoconfigure-2.2.2.RELEASE.jar!\META-INF\spring.factories
通过SPI方式加载
org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration,\


org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter内部类上面@Import了EnableWebMvcConfiguration类

EnableWebMvcConfiguration extends 了DelegatingWebMvcConfiguration extends 了WebMvcConfigurationSupport

在WebMvcConfigurationSupport里面逻辑
1————————
给
org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport#requestMappingHandlerAdapter
org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport#requestMappingHandlerMapping
两个加入到Spring容器里面

1————————