14 SpringBoot的Web开发简介

@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;
        }
    }