src/main/java/com/alipay/remoting/util/RemotingUtil.java
public static int parseRemotePort(final Channel channel) {
        if (null == channel) {
            return -1;
        }
        final InetSocketAddress remote = (InetSocketAddress) channel.remoteAddress();
        if (remote != null) {
            return remote.getPort();
        }
        return -1;
    }
public static int parseRemotePort(final Channel channel) {
        if (null == channel) {
            return -1;
        }
        final InetSocketAddress remote = (InetSocketAddress) channel.remoteAddress();
        if (remote != null) {
            return remote.getPort();
        }
        return -1;
    }
Parse the remote host port of the channel.

@param channel
@return int