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]
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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