public static void pack(java.io.File sourceDirPath, java.io.File zipFilePath) throws IOException {
	Path p = Files.createFile(zipFilePath.toPath());
	try (ZipOutputStream zs = new ZipOutputStream(Files.newOutputStream(p))) {
		Path pp = sourceDirPath.toPath();
		Files.walk(pp)
				.filter(path -> !Files.isDirectory(path))
				.forEach(path -> {
					ZipEntry zipEntry = new ZipEntry(pp.relativize(path).toString());
					try {
						zs.putNextEntry(zipEntry);
						Files.copy(path, zs);
						zs.closeEntry();
					} catch (IOException e) {
						e.printStackTrace();
					}
				});
	}
}