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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();