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【SpringBoot學習之路】10.Web開發之靜態資源的對映規則

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簡介

使用SpringBoot

  1. 建立SpringBoot應用,選中我們需要的模組;
  2. SpringBoot已經預設將這些場景配置好了,只需要在配置檔案中指定少量配置就可以執行起來
  3. 自己編寫業務程式碼;

自動配置原理?

這個場景SpringBoot幫我們配置了什麼?能不能修改?能修改哪些配置?能不能擴充套件?

xxxxAutoConfiguration:幫我們給容器中自動配置元件;
xxxxProperties:配置類來封裝配置檔案的內容;

SpringBoot對靜態資源的對映規則

@ConfigurationProperties(
    prefix = "spring.resources",
    ignoreUnknownFields = false
)
public class ResourceProperties {
//可以設定和靜態資源有關的引數,快取時間等
public class WebFluxAutoConfiguration {
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
                if (!this.resourceProperties.isAddMappings()) {
                    logger.debug("Default resource handling disabled");
                } else {
                    if (!registry.hasMappingForPattern("/webjars/**")) {
                        ResourceHandlerRegistration registration = registry.addResourceHandler(new String[]{"/webjars/**"}).addResourceLocations(new String[]{"classpath:/META-INF/resources/webjars/"});
                        this.configureResourceCaching(registration);
                        this.customizeResourceHandlerRegistration(registration);
                    }
    
                    String staticPathPattern = this.webFluxProperties.getStaticPathPattern();
                    //靜態資原始檔夾對映
                    if (!registry.hasMappingForPattern(staticPathPattern)) {
                        ResourceHandlerRegistration registration = registry.addResourceHandler(new String[]{staticPathPattern}).addResourceLocations(this.resourceProperties.getStaticLocations());
                        this.configureResourceCaching(registration);
                        this.customizeResourceHandlerRegistration(registration);
                    }
    
                }
            }
//配置喜歡的圖示            
public class WebMvcAutoConfiguration {            
            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);
                //所有 **/favicon.ico
                mapping.setUrlMap(Collections.singletonMap("**/favicon.ico", this.faviconRequestHandler()));
                return mapping;
            }

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

所有 /webjars/ ,都去 classpath:/META-INF/resources/webjars/ 找資源;

webjars:以jar包的方式引入靜態資源;

http://www.webjars.org/

image

http://localhost:8080/webjars/jquery/3.3.1-1/jquery.js可以直接訪問到js檔案內容

<!‐‐引入jquery‐webjar。在訪問的時候只需要寫webjars下面資源的名稱即可‐‐>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
            <version>3.3.1-1</version>
        </dependency>

"/" 訪問當前專案的任何資源,都去(靜態資源的資料夾)找對映

"classpath:/META‐INF/resources/",
"classpath:/resources/",
"classpath:/static/",
"classpath:/public/"
"/":當前專案的根路徑

localhost:8080/abc === 去靜態資原始檔夾裡面找abc

歡迎頁; 靜態資原始檔夾下的所有index.html頁面;被"/"對映;

localhost:8080/ 找index頁面

所有的 **/favicon.ico 都是在靜態資原始檔下找;