StasKolodyuk

public static void copyDirectoryFromResources(String source, final String target) throws IOException {
    PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
    Resource[] resources = resolver.getResources(source + "/**");

    for (Resource resource : resources) {
        if (resource.isReadable() && resource.contentLength() > 0) {
            String relativePath = StringUtils.substringAfter(resource.getURL().toExternalForm(), source);
            FileUtils.copyURLToFile(resource.getURL(), new File(target, relativePath));
        }
    }