Java：如何从 InetAddress 获取连接的端口？
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Java: How can I get the connected port from an InetAddress?
提问by DivideByHero
I'm trying to build a Java NIO-based socket server using Apache Mina. I really need to know the port of the remote host, not just the IP address, and it seems that Mina only exposes a SocketAddress (which can be downcast to InetAddress) object. I can get the IP address from InetAddress, but I normally use Socket.getPort() to get the port number, but Mina appears to obscure these low-level objects. Is there another way? Thanks!
我正在尝试使用 Apache Mina 构建一个基于 Java NIO 的套接字服务器。我真的需要知道远程主机的端口，而不仅仅是IP地址，而且Mina似乎只公开了一个SocketAddress（可以向下转换为InetAddress）对象。我可以从 InetAddress 获取 IP 地址，但我通常使用 Socket.getPort() 来获取端口号，但 Mina 似乎掩盖了这些低级对象。还有其他方法吗？谢谢！
回答by erickson
Downcast the SocketAddressto InetSocketAddress(not InetAddress, which is nota sub-class); this exposes a portaccessor.
向下转换SocketAddressto InetSocketAddress(not InetAddress，它不是一个子类); 这暴露了一个port访问器。
回答by ZZ Coder
I have a real old version but this worked for me,
我有一个真正的旧版本，但这对我有用，
public int getPort(SocketAddress address) {
return ((InetSocketAddress) address).getPort();
}
