docs: 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;
  		}
  		try {
  			ServerSocketFactory.getDefault().createServerSocket(port, 1, InetAddress.getByName(LOCAL_IP)).close();
  			return true;
  		} catch (Exception e) {
  			return false;
  		}
  	}