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【SpringBoot学习之路】10.Web开发之静态资源的映射规则

简介

使用SpringBoot

  1. 创建SpringBoot应用,选中我们需要的模块;
  2. SpringBoot已经默认将这些场景配置好了,只需要在配置文件中指定少量配置就可以运行起来
  3. 自己编写业务代码;

    自动配置原理?

    这个场景SpringBoot帮我们配置了什么?能不能修改?能修改哪些配置?能不能扩展?
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xxxxAutoConfiguration:帮我们给容器中自动配置组件;
xxxxProperties:配置类来封装配置文件的内容;

SpringBoot对静态资源的映射规则

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@ConfigurationProperties(
prefix = "spring.resources",
ignoreUnknownFields = false
)
public class ResourceProperties {
//可以设置和静态资源有关的参数,缓存时间等
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public class WebFluxAutoConfiguration {
public void addResourceHandlers(ResourceHandlerRegistry registry) {
if (!this.resourceProperties.isAddMappings()) {
logger.debug("Default resource handling disabled");
} else {
if (!registry.hasMappingForPattern("/webjars/**")) {
ResourceHandlerRegistration registration = registry.addResourceHandler(new String[]{"/webjars/**"}).addResourceLocations(new String[]{"classpath:/META-INF/resources/webjars/"});
this.configureResourceCaching(registration);
this.customizeResourceHandlerRegistration(registration);
}

String staticPathPattern = this.webFluxProperties.getStaticPathPattern();
//静态资源文件夹映射
if (!registry.hasMappingForPattern(staticPathPattern)) {
ResourceHandlerRegistration registration = registry.addResourceHandler(new String[]{staticPathPattern}).addResourceLocations(this.resourceProperties.getStaticLocations());
this.configureResourceCaching(registration);
this.customizeResourceHandlerRegistration(registration);
}

}
}
//配置喜欢的图标
public class WebMvcAutoConfiguration {
public static class FaviconConfiguration implements ResourceLoaderAware {
private final ResourceProperties resourceProperties;
private ResourceLoader resourceLoader;

public FaviconConfiguration(ResourceProperties resourceProperties) {
this.resourceProperties = resourceProperties;
}

public void setResourceLoader(ResourceLoader resourceLoader) {
this.resourceLoader = resourceLoader;
}

@Bean
public SimpleUrlHandlerMapping faviconHandlerMapping() {
SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping();
mapping.setOrder(-2147483647);
//所有 **/favicon.ico
mapping.setUrlMap(Collections.singletonMap("**/favicon.ico", this.faviconRequestHandler()));
return mapping;
}

@Bean
public ResourceHttpRequestHandler faviconRequestHandler() {
ResourceHttpRequestHandler requestHandler = new ResourceHttpRequestHandler();
requestHandler.setLocations(this.resolveFaviconLocations());
return requestHandler;
}

==所有 /webjars/都去 classpath:/META-INF/resources/webjars/ 找资源;==

webjars:以jar包的方式引入静态资源;

http://www.webjars.org/

image

http://localhost:8080/webjars/jquery/3.3.1-1/jquery.js可以直接访问到js文件内容

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<!‐‐引入jquery‐webjar。在访问的时候只需要写webjars下面资源的名称即可‐‐>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.3.1-1</version>
</dependency>

==”/“ 访问当前项目的任何资源,都去(静态资源的文件夹)找映射==

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

localhost:8080/abc === 去静态资源文件夹里面找abc

==欢迎页; 静态资源文件夹下的所有index.html页面;被”/“映射;==

localhost:8080/ 找index页面

==所有的 /favicon.ico 都是在静态资源文件下找;==**

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