Spring Boot学习(二十)之Spring boot中访问静态资源

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/
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;
    }
}

访问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

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

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