如何使用java获取本地系统的子网掩码？ [英] How to get subnet mask of local system using java?

问题描述

如何使用Java编程获取 Subnet 本地系统的掩码地址？

How to get Subnet mask address of local system using Java programming?

推荐答案

localhost接口的第一个地址的网络掩码：

the netmask of the first address of the localhost interface:

InetAddress localHost = Inet4Address.getLocalHost();
NetworkInterface networkInterface = NetworkInterface.getByInetAddress(localHost);
networkInterface.getInterfaceAddresses().get(0).getNetworkPrefixLength();

更完整的方法：

InetAddress localHost = Inet4Address.getLocalHost();
NetworkInterface networkInterface = NetworkInterface.getByInetAddress(localHost);

for (InterfaceAddress address : networkInterface.getInterfaceAddresses()) {
    System.out.println(address.getNetworkPrefixLength());
}

/ 24表示255.255.255。

/24 means 255.255.255.

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