SpringBoot对静态资源的映射规则

public void addResourceHandlers(ResourceHandlerRegistry registry) {
            if (!this.resourceProperties.isAddMappings()) {
                logger.debug("Default resource handling disabled");
            } else {
                Duration cachePeriod = this.resourceProperties.getCache().getPeriod();
                CacheControl cacheControl = this.resourceProperties.getCache().getCachecontrol().toHttpCacheControl();
                if (!registry.hasMappingForPattern("/webjars/**")) {
                    this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{"/webjars/**"}).addResourceLocations(new String[]{"classpath:/META-INF/resources/webjars/"}).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl).setUseLastModified(this.resourceProperties.getCache().isUseLastModified()));
                }

                String staticPathPattern = this.mvcProperties.getStaticPathPattern();
                if (!registry.hasMappingForPattern(staticPathPattern)) {
                    this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{staticPathPattern}).addResourceLocations(WebMvcAutoConfiguration.getResourceLocations(this.resourceProperties.getStaticLocations())).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl).setUseLastModified(this.resourceProperties.getCache().isUseLastModified()));
                }

            }
        }

　　所有

/webjars/**都去

classpath:/META-INF/resources/webjars/找资源；        webjars：以jar的方式导入静态资源；https://www.webjars.org/

localhost:8081/webjars/jquery/3.3.1/jquery.js访问

   <!--    引入jquery的web模块-->在访问的时候只需要写webjars下的资源的名称
    <dependency>
      <groupId>org.webjars</groupId>
      <artifactId>jquery</artifactId>
      <version>3.3.1</version>
    </dependency>

　2./** 访问当前项目的任何资源，（静态资源的文件夹）

“classPath：/META-INF/resources/”
"classPath:/resources/"
"classPath:/static/"
"classPath:/public"
"/" 当前项目根路径

　　localhost:8081/abc ===去静态资源文件夹下找abc

//配置欢迎页的映射   
 @Bean
        public WelcomePageHandlerMapping welcomePageHandlerMapping(ApplicationContext applicationContext, FormattingConversionService mvcConversionService, ResourceUrlProvider mvcResourceUrlProvider) {
            WelcomePageHandlerMapping welcomePageHandlerMapping = new WelcomePageHandlerMapping(new TemplateAvailabilityProviders(applicationContext), applicationContext, this.getWelcomePage(), this.mvcProperties.getStaticPathPattern());
            welcomePageHandlerMapping.setInterceptors(this.getInterceptors(mvcConversionService, mvcResourceUrlProvider));
            welcomePageHandlerMapping.setCorsConfigurations(this.getCorsConfigurations());
            return welcomePageHandlerMapping;
        }

　　3.欢迎页，静态资源文件夹下的所以index.html页面；被/**映射

localhost:8081/ 找index