有关我们web开发的配置SpringBoot都给我们放到了WebMvcAuotConfiguration这个类中,我们点开即可看到.它对静态资源的映射路径是怎么样的.
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
if (!this.resourceProperties.isAddMappings()) {
logger.debug("Default resource handling disabled");
return;
}
Integer cachePeriod = this.resourceProperties.getCachePeriod();
if (!registry.hasMappingForPattern("/webjars/**")) {
customizeResourceHandlerRegistration(
registry.addResourceHandler("/webjars/**")
.addResourceLocations(
"classpath:/META-INF/resources/webjars/")
.setCachePeriod(cachePeriod));
}
String staticPathPattern = this.mvcProperties.getStaticPathPattern();
//静态资源文件夹映射
if (!registry.hasMappingForPattern(staticPathPattern)) {
customizeResourceHandlerRegistration(
registry.addResourceHandler(staticPathPattern)
.addResourceLocations(
this.resourceProperties.getStaticLocations())
.setCachePeriod(cachePeriod));
}
}
我们可以看到所有 /webjars/** ,都去 classpath:/META-INF/resources/webjars/ 找资源;
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.3.1</version>
</dependency>
(1)在访问的时候只需要写webjars下面资源的名称即可
localhost:8080/webjars/jquery/3.3.1/jquery.js

成功的访问到了jquery的静态资源.
(2)"/**" 访问当前项目的任何资源,都去(静态资源的文件夹)找映射.
分析源码
if (!registry.hasMappingForPattern(staticPathPattern)) {
customizeResourceHandlerRegistration(
registry.addResourceHandler(staticPathPattern)
.addResourceLocations(
this.resourceProperties.getStaticLocations())
.setCachePeriod(cachePeriod));
}
}
private static final String[] CLASSPATH_RESOURCE_LOCATIONS = { "classpath:/META-INF/resources/",
"classpath:/resources/",
"classpath:/static/",
"classpath:/public/" };
"classpath:/META-INF/resources/",
"classpath:/resources/",
"classpath:/static/",
"classpath:/public/"
"/":当前项目的根路径
比如我们访问localhost:8080/nihao 都会去静态资源文件夹里面找nihao
(3)欢迎页; 静态资源文件夹下的所有index.html页面;被"/**"映射
@Bean
public WelcomePageHandlerMapping welcomePageHandlerMapping(
ResourceProperties resourceProperties) {
return new WelcomePageHandlerMapping(resourceProperties.getWelcomePage(),
this.mvcProperties.getStaticPathPattern());
}
也就是在localhost:8080/ 找index页面.放在静态资源文件夹就可以找到他为我们自动配置了匹配的前缀(index)和后缀(html).
(4)所有的 **/favicon.ico 都是在静态资源文件下找
配置我们喜欢的图标
mapping.setUrlMap(Collections.singletonMap("**/favicon.ico",
faviconRequestHandler()));
return mapping;
}
@Bean
public ResourceHttpRequestHandler faviconRequestHandler() {
ResourceHttpRequestHandler requestHandler = new ResourceHttpRequestHandler();
requestHandler
.setLocations(this.resourceProperties.getFaviconLocations());
return requestHandler;
}
}
我们图标的名字必须是faricon.ico必须放在静态资源的文件夹下才能被识别.

运行:

我们的图标也显示出来了!