SpringBoot对静态资源的映射规则，WebMvcAutoConfiguration类源码分析

SpringBoot对静态资源的映射规则

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1. 这段源码中配置了默认的静态资源路径

@ConfigurationProperties(prefix = "spring.resources", ignoreUnknownFields = false)
public class ResourceProperties {
    
    

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

2. 这段代码配置了外部引入的静态资源文件结构

@Override
		public void addResourceHandlers(ResourceHandlerRegistry registry) {
    
    
			if (!this.resourceProperties.isAddMappings()) {
    
    
				logger.debug("Default resource handling disabled");
				return;
			}
			Duration cachePeriod = this.resourceProperties.getCache().getPeriod();
			CacheControl cacheControl = this.resourceProperties.getCache().getCachecontrol().toHttpCacheControl();
			if (!registry.hasMappingForPattern("/webjars/**")) {
    
    
				customizeResourceHandlerRegistration(registry.addResourceHandler("/webjars/**")
						.addResourceLocations("classpath:/META-INF/resources/webjars/")
						.setCachePeriod(getSeconds(cachePeriod)).setCacheControl(cacheControl));
			}
			String staticPathPattern = this.mvcProperties.getStaticPathPattern();
			if (!registry.hasMappingForPattern(staticPathPattern)) {
    
    
				customizeResourceHandlerRegistration(registry.addResourceHandler(staticPathPattern)
						.addResourceLocations(getResourceLocations(this.resourceProperties.getStaticLocations()))
						.setCachePeriod(getSeconds(cachePeriod)).setCacheControl(cacheControl));
			}
		}

webjars网站
https://www.webjars.org/
引入jQuery依赖

<dependency>
    <groupId>org.webjars</groupId>
    <artifactId>jquery</artifactId>
    <version>3.5.1</version>
</dependency>

这个目录和源码的映射路径一致

http://localhost:8090/webjars/jquery/3.5.1/jquery.js
在浏览器地址栏输入以上网站就可以访问

3. "/**"的写法：访问当前项目的任何资源

"classpath:/META-INF/resources/",
"classpath:/resources/", 
"classpath:/static/", 
"classpath:/public/"

classpath 就是下图中的resource，在给这个目录下建META-INF/resources等都是可以访问到的

localhost:8080/abc === 去静态资源下找abc

4. 欢迎页：静态资源文件夹下所有index.html页面；被“/**”映射
   localhost:8080/ 找index页面

5. 配置静态资源位置

spring.resources.static-locations=classpath:/suitianshuang/