springboot - 静态资源路径配置

   

    静态资源配置

		@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();
			if (!registry.hasMappingForPattern(staticPathPattern)) {
				customizeResourceHandlerRegistration(
						registry.addResourceHandler(staticPathPattern)
								.addResourceLocations(
										this.resourceProperties.getStaticLocations())
						.setCachePeriod(cachePeriod));
			}
		}

    其中，其中addResourceHandler为添加映射路径，addResourceLocations为添加资源路径。staticPathPattern，staticLocations这两个属性分别来自于WebMvcProperties与ResourceProperties。

    WebMvcProperties

	/**
	 * Path pattern used for static resources.
	 */
	private String staticPathPattern = "/**";

     ResourceProperties

	private static final String[] SERVLET_RESOURCE_LOCATIONS = { "/" };

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

	private static final String[] RESOURCE_LOCATIONS;

	static {
		RESOURCE_LOCATIONS = new String[CLASSPATH_RESOURCE_LOCATIONS.length
				+ SERVLET_RESOURCE_LOCATIONS.length];
		System.arraycopy(SERVLET_RESOURCE_LOCATIONS, 0, RESOURCE_LOCATIONS, 0,
				SERVLET_RESOURCE_LOCATIONS.length);
		System.arraycopy(CLASSPATH_RESOURCE_LOCATIONS, 0, RESOURCE_LOCATIONS,
				SERVLET_RESOURCE_LOCATIONS.length, CLASSPATH_RESOURCE_LOCATIONS.length);
	}

	/**
	 * Locations of static resources. Defaults to classpath:[/META-INF/resources/,
	 * /resources/, /static/, /public/] plus context:/ (the root of the servlet context).
	 */
	private String[] staticLocations = RESOURCE_LOCATIONS;

     可以看出来，SpringBoot通过WebMvcAutoConfiguration的内部类WebMvcAutoConfigurationAdapter中addResourceHandlers方法，把类路径下/static、/public、/resources和/META-INF/resources文件夹下的静态资源文件直接映射为/**。