目錄

一、靜態資源配置原理

1.自動配置類

2.自動配置類的內部類

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一、靜態資源配置原理

* SpringBoot啟動默認加載 xxxAutoConfiguration 類（自動配置類）

* SpringMVC功能的自動配置類 WebMvcAutoConfiguration，生效

1.自動配置類

@Configuration(proxyBeanMethods = false) // 不會被代理 @ConditionalOnWebApplication(type = Type.SERVLET) // 是servlet項目 @ConditionalOnClass({ Servlet.class, DispatcherServlet.class, WebMvcConfigurer.class }) // 有這幾個類，導入springmvc的包就會有這幾個類 @ConditionalOnMissingBean(WebMvcConfigurationSupport.class) // 容器中沒有這個類型的組件時下面才會生效。（要全面接管springmvc） @AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE + 10) @AutoConfigureAfter({ DispatcherServletAutoConfiguration.class, TaskExecutionAutoConfiguration.class,ValidationAutoConfiguration.class }) public class WebMvcAutoConfiguration {

2.自動配置類的內部類

（1）配置文件的相關屬性和xxx進行了綁定。

WebMvcProperties==spring.mvc、ResourceProperties==spring.resources

@SuppressWarnings("deprecation") @Configuration(proxyBeanMethods = false) @Import(EnableWebMvcConfiguration.class) @EnableConfigurationProperties({ WebMvcProperties.class,org.springframework.boot.autoconfigure.web.ResourceProperties.class, WebProperties.class }) // 將配置文件與這幾個類綁定，并且導入到ioc容器中。 @Order(0) public static class WebMvcAutoConfigurationAdapter implements WebMvcConfigurer {

（2）這個內部類只有一個有參構造器：

//有參構造器所有參數的值都會從容器中確定 //ResourceProperties resourceProperties；獲取和spring.resources綁定的所有的值的對象 //WebMvcProperties mvcProperties 獲取和spring.mvc綁定的所有的值的對象 //ListableBeanFactory beanFactory Spring的beanFactory //HttpMessageConverters 找到所有的HttpMessageConverters //ResourceHandlerRegistrationCustomizer 找到 資源處理器的自定義器。========= //DispatcherServletPath 路徑處理器 //ServletRegistrationBean 給應用注冊Servlet、Filter、Listener....public WebMvcAutoConfigurationAdapter(org.springframework.boot.autoconfigure.web.ResourceProperties resourceProperties,WebProperties webProperties, WebMvcProperties mvcProperties, ListableBeanFactory beanFactory,ObjectProvider<HttpMessageConverters> messageConvertersProvider,ObjectProvider<ResourceHandlerRegistrationCustomizer> resourceHandlerRegistrationCustomizerProvider,ObjectProvider<DispatcherServletPath> dispatcherServletPath,ObjectProvider<ServletRegistrationBean<?>> servletRegistrations) {this.resourceProperties = resourceProperties.hasBeenCustomized() ? resourceProperties: webProperties.getResources();this.mvcProperties = mvcProperties;this.beanFactory = beanFactory;this.messageConvertersProvider = messageConvertersProvider;this.resourceHandlerRegistrationCustomizer = resourceHandlerRegistrationCustomizerProvider.getIfAvailable();this.dispatcherServletPath = dispatcherServletPath;this.servletRegistrations = servletRegistrations;this.mvcProperties.checkConfiguration(); }

（3）資源處理的默認規則

@Override public void addResourceHandlers(ResourceHandlerRegistry registry) {// 如果配置isAddMappings 配置為false，下面所有配置都不生效，默認為true。if (!this.resourceProperties.isAddMappings()) {logger.debug("Default resource handling disabled");return;}// 緩存Duration cachePeriod = this.resourceProperties.getCache().getPeriod();CacheControl cacheControl = this.resourceProperties.getCache().getCachecontrol().toHttpCacheControl();// webjars的規則，也可以緩存if (!registry.hasMappingForPattern("/webjars/**")) {customizeResourceHandlerRegistration(registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/").setCachePeriod(getSeconds(cachePeriod)).setCacheControl(cacheControl).setUseLastModified(this.resourceProperties.getCache().isUseLastModified()));}// staticPathPattern配置的請求（默認是/**）String staticPathPattern = this.mvcProperties.getStaticPathPattern();if (!registry.hasMappingForPattern(staticPathPattern)) {customizeResourceHandlerRegistration(registry.addResourceHandler(staticPathPattern).addResourceLocations(getResourceLocations(this.resourceProperties.getStaticLocations())).setCachePeriod(getSeconds(cachePeriod)).setCacheControl(cacheControl).setUseLastModified(this.resourceProperties.getCache().isUseLastModified()));} } spring:resources:add-mappings: false 禁用所有靜態資源規則 // 靜態資源默認的四個位置 @ConfigurationProperties(prefix = "spring.resources", ignoreUnknownFields = false) public class ResourceProperties {private static final String[] CLASSPATH_RESOURCE_LOCATIONS = { "classpath:/META-INF/resources/","classpath:/resources/", "classpath:/static/", "classpath:/public/" };/*** Locations of static resources. Defaults to classpath:[/META-INF/resources/,* /resources/, /static/, /public/].*/private String[] staticLocations = CLASSPATH_RESOURCE_LOCATIONS;

（4）歡迎頁的處理規則

// HandlerMapping：處理器映射。保存了每一個Handler能處理哪些請求。 @Bean public WelcomePageHandlerMapping welcomePageHandlerMapping(ApplicationContext applicationContext,FormattingConversionService mvcConversionService, ResourceUrlProvider mvcResourceUrlProvider) {WelcomePageHandlerMapping welcomePageHandlerMapping = new WelcomePageHandlerMapping(new TemplateAvailabilityProviders(applicationContext), applicationContext, getWelcomePage(),this.mvcProperties.getStaticPathPattern());welcomePageHandlerMapping.setInterceptors(getInterceptors(mvcConversionService, mvcResourceUrlProvider));welcomePageHandlerMapping.setCorsConfigurations(getCorsConfigurations());return welcomePageHandlerMapping; }// new WelcomePageHandlerMapping WelcomePageHandlerMapping(TemplateAvailabilityProviders templateAvailabilityProviders,ApplicationContext applicationContext, Optional<Resource> welcomePage, String staticPathPattern) {//要用歡迎頁功能，靜態資源路徑必須是/**if (welcomePage.isPresent() && "/**".equals(staticPathPattern)) {logger.info("Adding welcome page: " + welcomePage.get());setRootViewName("forward:index.html");}else if (welcomeTemplateExists(templateAvailabilityProviders, applicationContext)) {// 調用Controller /indexlogger.info("Adding welcome page template: index");setRootViewName("index");} }

（5）favicon

favicon跟代碼沒什么關系，是瀏覽器會自動發送/favicon.ico，進行查找favicon。

總結

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