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SpringBoot对静态资源的映射规则

程序员文章站 2022-07-10 19:56:47
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SpringBoot对静态资源的映射规则

@ConfigurationProperties(
    prefix = "spring.resources",
    ignoreUnknownFields = false
)
public class ResourceProperties {
	//可以设置和静态资源有关的参数
    private static final String[] CLASSPATH_RESOURCE_LOCATIONS = new String[]
    {"classpath:/META-INF/resources/", "classpath:/resources/", 
    "classpath:/static/", "classpath:/public/"};
    private String[] staticLocations;
    private boolean addMappings;
    private final ResourceProperties.Chain chain;
    private final ResourceProperties.Cache cache;

WebMvcAutoConfiguration:

  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();
                //静态资源文件夹映射
                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(WebMvcAutoConfiguration.getResourceLocations(this.resourceProperties.getStaticLocations())).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl));
                }

            }
        }


//配置欢迎页映射
      @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;
        }

1)、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。

http://www.webjars.org/
SpringBoot对静态资源的映射规则
localhost:8080/webjars/jquery/3.5.1/jquery.js

   <!--引入jquery的webjar:在访问的时候只需要写webjars下面资源的名称即可-->
    <dependency>
        <groupId>org.webjars</groupId>
        <artifactId>jquery</artifactId>
        <version>3.5.1</version>
    </dependency>

2)、"/**" 访问当前项目的任何资源,都去(静态资源的文件夹)找映射。

"classpath:/META‐INF/resources/",
"classpath:/resources/",
"classpath:/static/",
"classpath:/public/"
"/":当前项目的根路径

localhost:8080/abc === 去静态资源文件夹里面找abc

3)、欢迎页:静态资源文件夹下的所有index.html页面,被"/**"映射。
localhost:8080/ 找index页面

4)、所有的 **/favicon.ico 都是在静态资源文件下找(可以配置喜欢的图标)。