SpringBoot的静态资源映射规则

矫情吗；* 2021-12-07 13:55 327阅读 0赞

# 一、springBoot静态资源映射源码 #

WebMvcAuotConfiguration：
    @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));
    }
    }
    
    //配置欢迎页映射
    @Bean
    public WelcomePageHandlerMapping welcomePageHandlerMapping(
    ResourceProperties resourceProperties) { 
    return new WelcomePageHandlerMapping(resourceProperties.getWelcomePage(),
    this.mvcProperties.getStaticPathPattern());
    }
    
    //配置喜欢的图标
    @Configuration
    @ConditionalOnProperty(value = "spring.mvc.favicon.enabled", matchIfMissing = true)
    public static class FaviconConfiguration { 
    private final ResourceProperties resourceProperties;
    public FaviconConfiguration(ResourceProperties resourceProperties) { 
    this.resourceProperties = resourceProperties;
    }
    @Bean
    public SimpleUrlHandlerMapping faviconHandlerMapping() { 
    SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping();
    mapping.setOrder(Ordered.HIGHEST_PRECEDENCE + 1);
    //所有 **/favicon.ico
    mapping.setUrlMap(Collections.singletonMap("**/favicon.ico",
    faviconRequestHandler()));
    return mapping;
    }
    @Bean
    public ResourceHttpRequestHandler faviconRequestHandler() { 
    ResourceHttpRequestHandler requestHandler = new
    ResourceHttpRequestHandler();
    requestHandler
    .setLocations(this.resourceProperties.getFaviconLocations());
    return requestHandler;
    }
    }

# 二、映射规则 #

1、所有 /webjars/\*\* ，都去 classpath:/META-INF/resources/webjars/ 路径下寻找资源

[webjars查询网站入口][webjars]

<!‐‐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</version>
    </dependency>

资源访问路径：localhost:8080/webjars/jquery/3.3.1/jquery.js  
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

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

3、主页； 静态资源文件夹下的所有index.html页面；被"/\*\*"映射；  
4、所有的 \*\*/favicon.ico 都是在静态资源文件下找；

[webjars]: http://www.webjars.org/