5.对静态资源映射的规则

对静态资源映射的映射类配置：

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));
        }

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

    }
}

1）、 webjars

所有 /webjars/** ，都去 classpath:/META-INF/resources/webjars/ 找资源；

webjars：以jar包的方式引入静态资源；

网址： https://www.webjars.org/

访问网址进行一下测试：

http://localhost:8088/webjars/jquery/3.3.1/jquery.js

可以成功访问

ResourceProperties.java

@ConfigurationProperties(prefix = "spring.resources", ignoreUnknownFields = false)
public class ResourceProperties implements ResourceLoaderAware {
  //可以设置和静态资源有关的参数，缓存时间等
.....
}

在访问的时候只需要写webjars下面资源的名称即可

具体的引入maven再官网可进行查询

<!-- jquery的webjar-->
<dependency>
    <groupId>org.webjars</groupId>
    <artifactId>jquery</artifactId>
    <version>3.3.1</version>
</dependency>

此时引入之后就可以使用！！！！

2）、存放静态资源的位置

"/**" 访问当前项目的任何资源，都去（ 静态资源的文件夹）找映射

private static final String[] CLASSPATH_RESOURCE_LOCATIONS = new String[]{"
classpath:/META-INF/resources/",
"classpath:/resources/",
"classpath:/static/",
"classpath:/public/"};
"/"   当前项目根路径

在resources目录下的：

-resources

-static

-public

测试访问hello.html网页

可以直接找到网页文件的位置

3)、配置欢迎页

都在静态资源文件夹下....

@Configuration
@ConditionalOnProperty(
    value = {"spring.mvc.favicon.enabled"},
    matchIfMissing = true
)
public static class FaviconConfiguration implements ResourceLoaderAware {
    private final ResourceProperties resourceProperties;
    private ResourceLoader resourceLoader;

    public FaviconConfiguration(ResourceProperties resourceProperties) {
        this.resourceProperties = resourceProperties;
    }

    public void setResourceLoader(ResourceLoader resourceLoader) {
        this.resourceLoader = resourceLoader;
    }

    @Bean
    public SimpleUrlHandlerMapping faviconHandlerMapping() {
        SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping();
        mapping.setOrder(-2147483647);
        mapping.setUrlMap(Collections.singletonMap("**/favicon.ico", this.faviconRequestHandler()));
        return mapping;
    }

    @Bean
    public ResourceHttpRequestHandler faviconRequestHandler() {
        ResourceHttpRequestHandler requestHandler = new ResourceHttpRequestHandler();
        requestHandler.setLocations(this.resolveFaviconLocations());
        return requestHandler;
    }

    private List<Resource> resolveFaviconLocations() {
        String[] staticLocations = WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter.
　　getResourceLocations(this.resourceProperties.getStaticLocations());
   
     List<Resource> locations = new ArrayList(staticLocations.length + 1);
        Stream var10000 = Arrays.stream(staticLocations);
        ResourceLoader var10001 = this.resourceLoader;
        this.resourceLoader.getClass();
        var10000.map(var10001::getResource).forEach(locations::add);
        locations.add(new ClassPathResource("/"));
        return Collections.unmodifiableList(locations);
    }
}

所有的 **/favicon.ico 都是在静态资源文件下找；

与之前的进行对比

5）、配置文件的方式

spring.resources.static-locations=classpath:/hello,classpath:/qwe

实质是一个数组的形式，该配置之后静态文件不能访问

此时原来静态文件的文件

5.对静态资源映射的规则

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