这个聊天程序只是实现了基本的UDP穿透NAT的P2PCHAT，基于TCP和UPNP的就等大家一起探讨吧，奉献出来，仅供参考。 -This chat program is the realization of the basic UDP the NAT penetration P2PCHAT, based on TCP and UPNP, etc. Let us explore, dedication out for reference purposes only.