SpringBoot在项目中访问静态资源步骤分析

时间:2023-02-03 xl649138628 人气:0

在springboot项目中如果要在不集成templates的情况下访问静态资源需要做以下配置

1.在项目的application.yml文件中做如下配置

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

重点在

配置后生成为WebMvcProperties 配置类。该配置类中有一个内部类View

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

View类可以配置视图的前缀和后缀

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

2.在项目的resource路径下新建文件夹

在ResourceHttpRequestHandler类的getResource方法中调用了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());
        //重点关注此处
		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来自与springboot项目，其中时配置类ResourceProperties赋值。赋值的数据为

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

"classpath:/resources/",

"classpath:/static/",

"classpath:/public/"

四个路径

@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;

所以要访问静态资源需要配置到这四个路径下，如果所示

3.API端按如下编码

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

总结：

按照上面的配置后我们就可以访问到静态资源。

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