SpringBoot在項(xiàng)目中訪問(wèn)靜態(tài)資源步驟分析

更新時(shí)間：2023年01月28日 10:11:30 作者：xl649138628

今天在玩SpringBoot的demo的時(shí)候,放了張圖片在resources目錄下,啟動(dòng)區(qū)訪問(wèn)的時(shí)候,突然好奇是識(shí)別哪些文件夾來(lái)展示靜態(tài)資源的, 為什么有時(shí)候放的文件夾不能顯示,有的卻可以

在springboot項(xiàng)目中如果要在不集成templates的情況下訪問(wèn)靜態(tài)資源需要做以下配置

1.在項(xiàng)目的application.yml文件中做如下配置

spring:
profiles:
active: dev
mvc:
view:
prefix: /
suffix: .html

重點(diǎn)在

配置后生成為WebMvcProperties 配置類。該配置類中有一個(gè)內(nèi)部類View

@ConfigurationProperties(prefix = "spring.mvc")
public class WebMvcProperties {

View類可以配置視圖的前綴和后綴

	public static class View {
		/**
		 * Spring MVC view prefix.  前綴
		 */
		private String prefix;
		/**
		 * Spring MVC view suffix.  后綴
		 */
		private String suffix;

2.在項(xiàng)目的resource路徑下新建文件夾

在ResourceHttpRequestHandler類的getResource方法中調(diào)用了getLocations()方法。

protected Resource getResource(HttpServletRequest request) throws IOException {
		String path = (String) request.getAttribute(HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE);
		if (path == null) {
			throw new IllegalStateException("Required request attribute '" +
					HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE + "' is not set");
		}
		path = processPath(path);
		if (!StringUtils.hasText(path) || isInvalidPath(path)) {
			if (logger.isTraceEnabled()) {
				logger.trace("Ignoring invalid resource path [" + path + "]");
			}
			return null;
		}
		if (isInvalidEncodedPath(path)) {
			if (logger.isTraceEnabled()) {
				logger.trace("Ignoring invalid resource path with escape sequences [" + path + "]");
			}
			return null;
		}
		ResourceResolverChain resolveChain = new DefaultResourceResolverChain(getResourceResolvers());
        //重點(diǎn)關(guān)注此處
		Resource resource = resolveChain.resolveResource(request, path, getLocations());
		if (resource == null || getResourceTransformers().isEmpty()) {
			return resource;
		}
		ResourceTransformerChain transformChain =
				new DefaultResourceTransformerChain(resolveChain, getResourceTransformers());
		resource = transformChain.transform(request, resource);
		return resource;
	}

getLocations()方法返回的locations來(lái)自與springboot項(xiàng)目，其中時(shí)配置類ResourceProperties賦值。賦值的數(shù)據(jù)為

"classpath:/META-INF/resources/",

"classpath:/resources/",

"classpath:/static/",

"classpath:/public/"

四個(gè)路徑

@ConfigurationProperties(prefix = "spring.resources", ignoreUnknownFields = false)
public class ResourceProperties {
	private static final String[] CLASSPATH_RESOURCE_LOCATIONS = {
			"classpath:/META-INF/resources/", "classpath:/resources/",
			"classpath:/static/", "classpath:/public/" };
	/**
	 * Locations of static resources. Defaults to classpath:[/META-INF/resources/,
	 * /resources/, /static/, /public/].
	 */
	private String[] staticLocations = CLASSPATH_RESOURCE_LOCATIONS;

所以要訪問(wèn)靜態(tài)資源需要配置到這四個(gè)路徑下，如果所示

3.API端按如下編碼

@Controller
public class PageApi {
    @GetMapping({"/", "/index"})
    public String toPage(String id){
        return "index";
    }
}

總結(jié)：

按照上面的配置后我們就可以訪問(wèn)到靜態(tài)資源。

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