使用Java 6+，您可以使用 NetworkInterface.getHardwareAddress 。

With Java 6+, you can use NetworkInterface.getHardwareAddress.

请记住，计算机可以没有网卡，特别是如果它是嵌入式或虚拟的。它也可以有多个。您可以使用 NetworkInterface.getNetworkInterfaces（） 。

Bear in mind that a computer can have no network cards, especially if it's embedded or virtual. It can also have more than one. You can get a list of all network cards with NetworkInterface.getNetworkInterfaces().