SpringBoot--静态资源的映射规则

深藏阁楼爱情的钟 2021-08-13 11:44 504阅读 0赞

#### 静态资源的映射规则 ####

@ConfigurationProperties(prefix = "spring.resources", ignoreUnknownFields = false)
    public class ResourceProperties implements ResourceLoaderAware { 
      //可以设置和静态资源有关的参数，缓存时间等

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;
    			}
    
    		}

1）、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/

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70]

localhost:8080/webjars/jquery/3.3.1/jquery.js

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>

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

localhost:8080/abc === 去静态资源文件夹里面找abc

3）、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

4）、所有的 \*\*/favicon.ico 都是在静态资源文件下找；

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70]: /images/20210813/272912b7d1c946d39b11001afb94158e.png