springboot靜態資源加載默認是從/static(或/public或/resources或/META-INF/resources) 目錄下加載靜態資源。
加載的優選級別:/META-INF/resources》/resources》/public》/static
靜態資源的加載源碼分析(WebMvcAutoConfiguration類)
首先從WebMvcAutoConfiguration.class自動配置類部分代碼來看:
//添加靜態資源規則 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(); //webjars依賴映射規則 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)); } //本地配置的映射規則 //this.resourceProperties.getStaticLocations() 從ResourceProperties中加載靜態路徑 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)); } } }
ResourceProperties類部分源碼
@ConfigurationProperties( prefix = "spring.resources", ignoreUnknownFields = false ) public class ResourceProperties { //springboot默認的加載路徑 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;
映射規則總結
在springboot靜態資源加載規則中,除了”標準“靜態資源位置之外,還有一個較為特殊的WebJars
“標準”靜態資源映射規則
所有的“/**”的請求,如果沒有對應的處理,那麼就去默認映射的靜態資源目錄下去找,如下所示:
"classpath:/META-INF/resources/"
"classpath:/resources/"
"classpath:/static/",
"classpath:/public/"
“/**”
所有的webjars的請求都會去 ”classpath:/META-INF/resources/webjars/**“去資源
(如果 以jar包的方式來引入jquery包)
在pom.xml中引入依賴
org.webjarsjquery3.3.1-2
從引入的包目錄來看
springboot默認歡迎頁面
自動去加載默認目錄下的index.html;如static/index.html
自定義配置靜態資源目錄
在application.properties文件中去配置
//配置test為靜態資源目錄
spring.resources.static-locations=classpath:/test/
遇到的坑
在配置了靜態資源目錄的時候,跳轉到的頁面路徑不能寫絕對路徑,
比如:spring.resources.static-locations=classpath:/test/ 我配置test為靜態資源的加載位置,在訪問的時候不需要寫test
請求:http://127.0.0.1:8085/test/1.png
請求:http://127.0.0.1:8085/1.png
[ml5rwbikls ] Springboot靜態資源訪問實現代碼解析已經有223次圍觀