SpringBoot 静态资源导入及首页设置问题

@Override
public void addResourceHandlers(ResourceHandlerReGIStry registry) {
    if (!this.resourceProperties.isAddMappings()) {
        logger.debug("Default resource handling disabled");
        return;
    }
    addResourceHandler(registry, "/webjars
private String staticPathPattern = "/**";

public static class Resources {

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

@Bean
public WelcomePageHandlerMapping welcomePageHandlerMapping(ApplicationContext applicationContext,
                                                           FORMattinGConversionService mvcConversionService, ResourceUrlProvider mvcResourceUrlProvider) {
    WelcomePageHandlerMapping welcomePageHandlerMapping = new WelcomePageHandlerMapping(
        new TemplateAvailabilityProviders(applicationContext), applicationContext, getWelcomePage(),
        this.mvcProperties.getStaticPathPattern());
    welcomePageHandlerMapping.setInterceptors(getInterceptors(mvcConversionService, mvcResourceUrlProvider));
    welcomePageHandlerMapping.setCorsConfigurations(getCorsConfigurations());
    return welcomePageHandlerMapping;
}

private Resource getWelcomePage() {
    for (String location : this.resourceProperties.getStaticLocations()) {
        Resource indexhtml = getIndexHtml(location);
        if (indexHtml != null) {
            return indexHtml;
        }
    }
    ServletContext servletContext = getServletContext();
    if (servletContext != null) {
        return getIndexHtml(new ServletContextResource(servletContext, SERVLET_LOCATION));
    }
    return null;
}

private Resource getIndexHtml(String location) {
    return getIndexHtml(this.resourceLoader.getResource(location));
}

private Resource getIndexHtml(Resource location) {
    try {
        Resource resource = location.createRelative("index.html");
        if (resource.exists() && (resource.getURL() != null)) {
            return resource;
        }
    }
    catch (Exception ex) {
    }
    return null;
}