SpringBoot如何通过webjars管理静态资源文件夹

WebMvcAutoConfiguration

添加资源映射：

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();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));}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));} } }

所有'/webjars/**'路径 ， 都去类路径下 classpath: /META-INF/resources/webjars/ 找资源， 所以就是

http://localhost:8080/webjars/jquery/3.5.1/jquery.js

能访问

/META-INF/resources/webjars/jquery/3.5.1/jquery.js 路径的文件

1) webjars： 以jar包的方式引入静态资源

什么是webjar?

搜索webjar， 可以将jquery用pom引入：

引入， 正好对应这个映射：

结果是的：

2) springboot对静态资源的映射规则：

看代码：

还是

WebMvcAutoConfiguration的这个方法

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(); 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)); } 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)); } }}

进去：

WebMvcProperties

private String staticPathPattern; private final WebMvcProperties.Async async; private final WebMvcProperties.Servlet servlet; private final WebMvcProperties.View view; private final WebMvcProperties.Contentnegotiation contentnegotiation; private final WebMvcProperties.Pathmatch pathmatch; public WebMvcProperties() { this.localeResolver = WebMvcProperties.LocaleResolver.ACCEPT_HEADER; this.format = new WebMvcProperties.Format(); this.dispatchTraceRequest = false; this.dispatchOptionsRequest = true; this.ignoreDefaultModelOnRedirect = true; this.publishRequestHandledEvents = true; this.throwExceptionIfNoHandlerFound = false; this.logResolvedException = false; this.staticPathPattern = '/**'; this.async = new WebMvcProperties.Async(); this.servlet = new WebMvcProperties.Servlet(); this.view = new WebMvcProperties.View(); this.contentnegotiation = new WebMvcProperties.Contentnegotiation(); this.pathmatch = new WebMvcProperties.Pathmatch(); }

addResourceLocations(WebMvcAutoConfiguration.getResourceLocations(this.resourceProperties.getStaticLocations())) 这里添加了资源的位置

public class ResourceProperties { 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; public ResourceProperties() { this.staticLocations = CLASSPATH_RESOURCE_LOCATIONS; this.addMappings = true; this.chain = new ResourceProperties.Chain(); this.cache = new ResourceProperties.Cache(); }

'/**'访问当前项目的任何资源， （静态资源的文件夹） ，如果没人处理，会默认去以下几个文件路径下找[/code]复制代码 代码如下:// 静态资源文件夹， 这几个都可以存放静态资源：

classpath:/META-INF/resources/classpath:/resources/'classpath:/static/'classpath:/public/

例如 localhost:8080/a/b.js ， 可以到 /META-INF/resources/a/b.js 找

或者：

/resources/a/b.js找：

或者类路径下/static/a/b.js找：

或者/public/a/b.js下找

3）欢迎页面： 静态资源文件夹下的所有index.html页面： 被 /**映射

http://localhost:8080/ 会到以上静态资源文件夹中找index.html页面

源码有变化，我没明白回头再看

结果：

路径：

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