静态资源的映射

Spring Boot与Web开发-静态资源的映射

使用Spring Boot：

1. 创建SpringBoot，选中我们需要的模块
2. SpringBoot 默认配置好场景，只需要在配置文件中指定少量配置
3. 编写业务代码

对静态资源的映射规则

@ConfigurationProperties(
    prefix = "spring.resources",
    ignoreUnknownFields = false
)
public class ResourceProperties {
    //可以设置缓存有关的参数，缓存等

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));
                }

            }
        }


//欢迎页的映射
 @Bean
 public WelcomePageHandlerMapping welcomePageHandlerMapping(ApplicationContext applicationContext, FormattingConversionService mvcConversionService, ResourceUrlProvider mvcResourceUrlProvider) {
            WelcomePageHandlerMapping welcomePageHandlerMapping = new WelcomePageHandlerMapping(new TemplateAvailabilityProviders(applicationContext), applicationContext, this.getWelcomePage(), this.mvcProperties.getStaticPathPattern());
            welcomePageHandlerMapping.setInterceptors(this.getInterceptors(mvcConversionService, mvcResourceUrlProvider));
            welcomePageHandlerMapping.setCorsConfigurations(this.getCorsConfigurations());
            return welcomePageHandlerMapping;
        }

1. 所有 /webjars/** 的请求，都去classpath:/META-INF/resources/webjars/找资源；

   webjars：以jar包的方式引入静态资源；

   ​ eg: META-INF esourceswebjarsjquery3.3.1jquery.js

   发送localhost:8080/webjars/jquery/3.3.1/jquery.js可以访问到

   只需引入依赖

   <!--        引入jquery-webjar-->
           <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

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

• classpath: 是类路径下的目录：java和resource下

3. 首页；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；将图片改为favicon.ico，可以自动映射过去，首页图标

5. 自定义静态资源文件夹路径：

   spring.resources.static-locations=classpath:/hello/