netty获取ip和端口

udp协议：

        会有一个DatagramPacket datagramPacket对象

		InetSocketAddress  remoteAddress = datagramPacket.sender();
		String ip = remoteAddress.getAddress().getHostAddress();
		int port = remoteAddress.getPort();

tcp协议：

	InetSocketAddress insocket = (InetSocketAddress) ctx.channel().remoteAddress();
	String ip = insocket.getAddress().getHostAddress();
	int port = insocket.getPort();

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