SpringBoot-web靜態資源映射規則(六)

有關咱們web開發的配置SpringBoot都給咱們放到了WebMvcAuotConfiguration這個類中,咱們點開便可看到.它對靜態資源的映射路徑是怎麼樣的.

@Override public void addResourceHandlers(ResourceHandlerRegistry registry) { if (!this.resourceProperties.isAddMappings()) { logger.debug("Default resource handling disabled"); return; } Integer cachePeriod = this.resourceProperties.getCachePeriod(); if (!registry.hasMappingForPattern("/webjars/**")) { customizeResourceHandlerRegistration( registry.addResourceHandler("/webjars/**") .addResourceLocations( "classpath:/META-INF/resources/webjars/") .setCachePeriod(cachePeriod)); } String staticPathPattern = this.mvcProperties.getStaticPathPattern(); //靜態資源文件夾映射
            if (!registry.hasMappingForPattern(staticPathPattern)) { customizeResourceHandlerRegistration( registry.addResourceHandler(staticPathPattern) .addResourceLocations( this.resourceProperties.getStaticLocations()) .setCachePeriod(cachePeriod)); } }

咱們能夠看到全部 /webjars/** ，都去 classpath:/META-INF/resources/webjars/ 找資源；

webjars：以jar包的方式引入靜態資源；

咱們能夠去webjars的官網去看看.http://www.webjars.org/

導入jquery的maven依賴測試一下.

<dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
            <version>3.3.1</version>
</dependency>

(1)在訪問的時候只須要寫webjars下面資源的名稱便可

localhost:8080/webjars/jquery/3.3.1/jquery.js

成功的訪問到了jquery的靜態資源.

(2)"/**" 訪問當前項目的任何資源,都去（靜態資源的文件夾）找映射.

分析源碼

if (!registry.hasMappingForPattern(staticPathPattern)) { customizeResourceHandlerRegistration( registry.addResourceHandler(staticPathPattern) .addResourceLocations( this.resourceProperties.getStaticLocations()) .setCachePeriod(cachePeriod)); } }

private static final String[] CLASSPATH_RESOURCE_LOCATIONS = { "classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/" };

 

"classpath:/META-INF/resources/",
"classpath:/resources/",
"classpath:/static/",
"classpath:/public/"
"/"：當前項目的根路徑

好比咱們訪問localhost:8080/nihao 都會去靜態資源文件夾裏面找nihao

(3)歡迎頁； 靜態資源文件夾下的全部index.html頁面；被"/**"映射

@Bean public WelcomePageHandlerMapping welcomePageHandlerMapping( ResourceProperties resourceProperties) { return new WelcomePageHandlerMapping(resourceProperties.getWelcomePage(), this.mvcProperties.getStaticPathPattern()); }

也就是在localhost:8080/ 找index頁面.放在靜態資源文件夾就能夠找到他爲咱們自動配置了匹配的前綴(index)和後綴(html).

(4)全部的 **/favicon.ico 都是在靜態資源文件下找

配置咱們喜歡的圖標

mapping.setUrlMap(Collections.singletonMap("**/favicon.ico", faviconRequestHandler())); return mapping; } @Bean public ResourceHttpRequestHandler faviconRequestHandler() { ResourceHttpRequestHandler requestHandler = new ResourceHttpRequestHandler(); requestHandler .setLocations(this.resourceProperties.getFaviconLocations()); return requestHandler; } }

咱們圖標的名字必須是faricon.ico必須放在靜態資源的文件夾下才能被識別.

運行:

咱們的圖標也顯示出來了!