连网坦克（Unrecognized Windows Sockets error: 0: Cannot bind）

server端报错：

java.net.SocketException: Unrecognized Windows Sockets error: 0: Cannot bind

at java.net.PlainDatagramSocketImpl.bind0(Native Method)
at java.net.PlainDatagramSocketImpl.bind(PlainDatagramSocketImpl.java:82)
at java.net.DatagramSocket.bind(DatagramSocket.java:368)
at java.net.DatagramSocket.<init>(DatagramSocket.java:210)
at java.net.DatagramSocket.<init>(DatagramSocket.java:261)
at java.net.DatagramSocket.<init>(DatagramSocket.java:234)
at TankServer$UDPThread.run(TankServer.java:86)
at java.lang.Thread.run(Thread.java:619)

UDP Thread started at port : 6666

原因：6666端口被占用