Java using UDP through a NAT. The UDP' s connectionless, so it is necessary to maintain their own connection code has been tested.

UDPTestP2P\UDPTestP2P\.classpath
..........\..........\.project
..........\..........\bin\xwz\p2p\upd\client\HeartThread.class
..........\..........\...\...\...\...\......\MainClient.class
..........\..........\...\...\...\...\server\MainServer.class
..........\..........\...\...\...\...\util\ConnectionClientInfo.class
..........\..........\...\...\...\...\....\MyProtocol.class
..........\..........\...\...\...\...\....\StringUtil.class
..........\..........\...\进度.txt
..........\..........\src\xwz\p2p\upd\client\HeartThread.java
..........\..........\...\...\...\...\......\MainClient.java
..........\..........\...\...\...\...\server\MainServer.java
..........\..........\...\...\...\...\util\ConnectionClientInfo.java
..........\..........\...\...\...\...\....\MyProtocol.java
..........\..........\...\...\...\...\....\StringUtil.java
..........\..........\...\进度.txt
..........\..........\bin\xwz\p2p\upd\client
..........\..........\...\...\...\...\server
..........\..........\...\...\...\...\util
..........\..........\src\xwz\p2p\upd\client
..........\..........\...\...\...\...\server
..........\..........\...\...\...\...\util
..........\..........\bin\xwz\p2p\upd
..........\..........\src\xwz\p2p\upd
..........\..........\bin\xwz\p2p
..........\..........\src\xwz\p2p
..........\..........\bin\xwz
..........\..........\src\xwz
..........\..........\bin
..........\..........\src
..........\UDPTestP2P
UDPTestP2P

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