SpringBoot对静态资源的映射规则

SpringBoot对静态资源的映射规则

@ConfigurationProperties(prefix = "spring.resource",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

@Override
	public void addResource(ResourceHandlerRegistry registry){
		if(!this.resourceProperties.isAddMappings()){
			logger.debug("Default resource handing disabled");
			return;
		}
		Integer cachePeriod = this.resourceProperties.getCachePeriod();
		if(!registry.hasMappingForPattern("/webjar/**")){
			customizeResourceHandlerRegistration(
					registry.addResourceHandler("/webjar/**")
							.addResourceLocations(
									"classpath:/META-INF/resources/webjars/")
					.setCachePeriod(cachePeriod));				
		}
		String staticPathPattern = this.mvcProperties.getStaticPathPattern();
		if(!registry.hasMappingForPattern(staticPathPattern)){
			customizeResourceHandlerRegistration(
					registry.addResourceHandler(staticPathPattern)
		                    .addResourceLocations(
		                    		this.resourceProperties.getStaticLocations())
		            .setCachePeriod(cachePeriod));	        		
		}
	}

1）、所有/webjar/**，都去classpath:/META-INF/resources/webjars/找资源；
webjar：以jar包的方式引入静态资源；
https://www.webjars.org/

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

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

2）、"/**"访问当前项目的任何资源，（静态资源的文件夹）

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

public String getStaticPathPattern() {
	return this.staticPathPattern;
}

private String staticPathPattern = "/**";

public String[] getStaticLocations() {
	return this.staticLocations;
}

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

private String[] staticLocations = CLASSPATH_RESOURCE_LOCATIONS;

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