java--判断ip、端口是连通性

public static boolean isHostConnectable(String host, int port) {
        Socket socket = new Socket();
        try {
            socket.connect(new InetSocketAddress(host, port));
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        } finally {
            try {
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return true;
    }

public static boolean isHostReachable(String host, Integer timeOut) {
        try {
            return InetAddress.getByName(host).isReachable(timeOut);
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }