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欢迎页配置

默认放在static文件夹下，index.html即为欢迎页

手动修改欢迎页的位置

在application.yaml文件中配置如下

spring:
  web:
    resources:
      static-locations: [classpath:/haha/]

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注意：可以配置静态资源路径，但不可以配置静态资源的访问前缀，否则导致index.html不能被默认访问

Favicon

将图标放到静态资源路径，默认是static，因为上面我们改了，所以是haha路径下，图标命名应为favicon.ico

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注意：如果浏览器访问网站时网站还没有图标，后配置，但是浏览器没关，以后图标都不会出现，这是因为浏览器session的缘故，所以需要换一个浏览器尝试，同样也不可以配置静态资源路径前缀，否则会影响功能的实现。

底层分析

大多数配置都在这个Servlet文件夹里

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给容器中配了什么

@Configuration(proxyBeanMethods = false)
@Import(EnableWebMvcConfiguration.class)
@EnableConfigurationProperties({ WebMvcProperties.class, WebProperties.class })
@Order(0)
public static class WebMvcAutoConfigurationAdapter implements WebMvcConfigurer, ServletContextAware {}

WebMvcProperties.class和spring.mvc进行了绑定，WebProperties和spring.web进行了绑定

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配置类只有一个有参构造器

有参构造的所有参数的值都会在构造器中确定

public WebMvcAutoConfigurationAdapter(WebProperties webProperties, WebMvcProperties mvcProperties,
				ListableBeanFactory beanFactory, ObjectProvider<HttpMessageConverters> messageConvertersProvider,
				ObjectProvider<ResourceHandlerRegistrationCustomizer> resourceHandlerRegistrationCustomizerProvider,
				ObjectProvider<DispatcherServletPath> dispatcherServletPath,
				ObjectProvider<ServletRegistrationBean<?>> servletRegistrations) {
			this.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();
		}

分析：

禁用静态资源

@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
	if (!this.resourceProperties.isAddMappings()) {
		logger.debug("Default resource handling disabled");
		return;
	}
	addResourceHandler(registry, "/webjars/**", "classpath:/META-INF/resources/webjars/");
	addResourceHandler(registry, this.mvcProperties.getStaticPathPattern(), (registration) -> {
				registration.addResourceLocations(this.resourceProperties.getStaticLocations());
		if (this.servletContext != null) {
			ServletContextResource resource = new ServletContextResource(this.servletContext, SERVLET_LOCATION);
			registration.addResourceLocations(resource);
				}
			});
		}

当add-mappings：false时，所有的静态资源都被禁用

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设置缓存的时间

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Webjars的规则

@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
	if (!this.resourceProperties.isAddMappings()) {
		logger.debug("Default resource handling disabled");
		return;
   	}
	addResourceHandler(registry, "/webjars/**", "classpath:/META-INF/resources/webjars/");
	addResourceHandler(registry, this.mvcProperties.getStaticPathPattern(), (registration) -> {
				    
        registration.addResourceLocations(this.resourceProperties.getStaticLocations());
		if (this.servletContext != null) {
		ServletContextResource resource = new ServletContextResource(this.servletContext, SERVLET_LOCATION);
		registration.addResourceLocations(resource);
				}
			});
		}

搜索webjars的时候，会沿着该路径往下找

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欢迎页

@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;
}

这个地方是写死的，所以不能修改静态网页的前缀

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