Spring Boot学习(二十)之Spring boot中访问静态资源

落日映苍穹つ 2021-10-18 07:26 360阅读 0赞

SpringBoot对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 {

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/][http_www.webjars.org]  
localhost:8080/webjars/jquery/3.3.1/jquery.js

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;
        }
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW9rZWppbjUyMQ_size_16_color_FFFFFF_t_70][]

访问[http://localhost:8080/webjars/jquery/3.3.1/jquery.js][http_localhost_8080_webjars_jquery_3.3.1_jquery.js]

<!‐‐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>

结果

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW9rZWppbjUyMQ_size_16_color_FFFFFF_t_70 1][]

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

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；

5）、自定义配置文件访问规则

@Configuration配置去配置我们需要的一些属性

import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
    @Configuration
    public class WebMvcConfig extends WebMvcConfigurerAdapter {
        private Logger logger = LoggerFactory.getLogger(this.getClass());
        @Override
        public void addResourceHandlers(ResourceHandlerRegistry registry) {
            registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
            registry.addResourceHandler("/upload/**").addResourceLocations("classpath:/upload/");
            logger.info("配置静态文件!");
        }
    }

Spring Boot默认提供静态资源目录位置需置于classpath下, 文件名需符合下面规则：

*  /static
 *  /public
 *  /resources
 *  /META-INF/resources

灵光一现想到web项目的默认页面是直接放在webcontent下面, 虽然需要在web.xml配置, 虽然Spring Boot 并没有web.xml但试试又不要钱于是

只要将index.html放在上面规则的目录下, 在访问项目的时候会被默认加载

可以去我的首页查看群，进入2000人的群交流学习

[http_www.webjars.org]: http://www.webjars.org/
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[http_localhost_8080_webjars_jquery_3.3.1_jquery.js]: http://localhost:8080/webjars/jquery/3.3.1/jquery.js
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW9rZWppbjUyMQ_size_16_color_FFFFFF_t_70 1]: /images/20211018/6a745fb9420a4f4b8ce995bebe15db1b.png