java使用UDP穿透NAT.由于UDP的无连接的,所以需要自己维护连接,那就是心跳!-java to use UDP through NAT. because of the non-UDP connections, so the need to maintain their own connections, and that is heart!

java实现 内网和内网通信,java p2p ,java nat穿透-java achieve within the network and the network communication, java p2p, java nat penetrating