@Override
	synchronized public boolean cd(String directory) {
		if (StrUtil.isBlank(directory)) {
			// 当前目录
			return true;
		}

		try {
			return client.changeWorkingDirectory(directory);
		} catch (IOException e) {
			throw new IORuntimeException(e);
		}
	}
@Test
	@Disabled
	public void cdTest() {
		final Ftp ftp = new Ftp("looly.centos");

		ftp.cd("/file/aaa");
		Console.log(ftp.pwd());

		IoUtil.close(ftp);
	}