public static boolean isUsableLocalPort(int port) {
		if (false == isValidPort(port)) {
			// 给定的IP未在指定端口范围中
			return false;
		}

		// issue#765@Github, 某些绑定非127.0.0.1的端口无法被检测到
		try (ServerSocket ss = new ServerSocket(port)) {
			ss.setReuseAddress(true);
		} catch (IOException ignored) {
			return false;
		}

		try (DatagramSocket ds = new DatagramSocket(port)) {
			ds.setReuseAddress(true);
		} catch (IOException ignored) {
			return false;
		}

		return true;
	}
@Test
	@Disabled
	public void isUsableLocalPortTest(){
		assertTrue(NetUtil.isUsableLocalPort(80));
	}