JSTUN 出现 java.net.BindException: Address already in use: Cannot bind
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使用JSTUN,进行NAT穿越的时候,总是出现java.net.BindException: Address already in use: Cannot bind
换其他机器测试,没有问题。只有自己机器运行出现这个问题。
打开JSTUN源码,查看DiscoveryTest 的 Test2() 方法 170行;
int localPort = sendSocket.getLocalPort();
InetAddress localAddress = sendSocket.getLocalAddress();
sendSocket.close();
DatagramSocket receiveSocket = new DatagramSocket(localPort, localAddress);
receiveSocket.connect(ca.getAddress().getInetAddress(), ca.getPort());
receiveSocket.setSoTimeout(timeout);
是在Socket获取本地端口,然后再构造 DatagramSocket(localPort, localAddress);
经过调试,原因是因为线程, 没有执行到sendSocket.close(); 方法,就去执行new DataGramSocket(localPort , localAddress);
端口未关闭,就去构造新的Socket,就出现的以上异常信息。
在close(); 之后,执行:
try {
Thread.sleep(5);
//CPU 睡眠10毫秒,否则会出现端口还未关闭,就开始执行下面的new 语句,出现端口被占用异常(可能出四核八线程机器才有的问题)
} catch (InterruptedException e) {
e.printStackTrace();
}
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