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/]
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
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
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
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
设置缓存的时间
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
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
