SpringBoot——静态资源映射规则

静态资源映射

SpringBoot对于SpringMVC的自动化配置都在WebMVCAutoConfiguration类中。

其中一个静态内部类WebMvcAutoConfigurationAdapter实现了WebMvcConfigurer接口。(361)

WebMvcConfigurer接口中定义了addResourceHandlers处理静态资源的默认映射关系.（500）

addResourceHandlers在WebMvcAutoConfigurationAdapter类中实现

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));
                }

            }
        }

其中

this.resourceProperties.getStaticLocations()

返回静态资源的默认映射关系，

getStaticLocations()方法在ResourceProperties中定义

其中，

private static final String[] CLASSPATH_RESOURCE_LOCATIONS = new String[]{"classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/"};

classpath:/META-INF/resources/

classpath:/resources/

classpath:/static/

classpath:/public/

第五个默认的资源映射：在静态方法getResourceLocations中定义

/

小结：

默认状况下，能够在如下五个位置放置静态资源

classpath:/META-INF/resources/

classpath:/resources/

classpath:/static/

classpath:/public/

/

【静态资源通常放在classpath:/static/目录下】

自定义favicon，自定义index.html

favicon.ico是浏览器左上角的图标，能够放在静态资源路径下或者类路径下，静态资源路径优先级高。

SpringBoot启动后默认在静态资源目录下寻找index.html,若是没有找到；就会去resource/templates目录下寻找index.html(使用Thymeleaf模板)

定制banner

http://www.network-science.de/ascii/

建立banner.txt文件置于resource目录下

SpringBoot热部署

<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

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