如何通过Java获取linux上电脑的ip? [英] How to get the ip of the computer on linux through Java?

问题描述

如何通过Java获取linux上电脑的ip?

How to get the ip of the computer on linux through Java ?

我在网上搜索了一些例子，我找到了一些关于 NetworkInterface 类的东西，但我无法理解我是如何获得 Ip 地址的.

I searched the net for examples, I found something regarding NetworkInterface class, but I can't wrap my head around how I get the Ip address.

如果我同时运行多个网络接口会怎样?将返回哪个 IP 地址.

What happens if I have multiple network interfaces running in the same time ? Which Ip address will be returned.

我非常感谢一些代码示例.

I would really appreciate some code samples.

P.S:到目前为止，我一直使用 InetAddress 类，这对于跨平台应用程序来说是一个糟糕的解决方案.(win/Linux).

P.S: I've used until now the InetAddress class which is a bad solution for cross-platform applications. (win/Linux).

推荐答案

不要忘记环回地址，它们在外部是不可见的.这是一个提取第一个非环回IP(IPv4或IPv6)的函数

Do not forget about loopback addresses, which are not visible outside. Here is a function which extracts the first non-loopback IP(IPv4 or IPv6)

private static InetAddress getFirstNonLoopbackAddress(boolean preferIpv4, boolean preferIPv6) throws SocketException {
    Enumeration en = NetworkInterface.getNetworkInterfaces();
    while (en.hasMoreElements()) {
        NetworkInterface i = (NetworkInterface) en.nextElement();
        for (Enumeration en2 = i.getInetAddresses(); en2.hasMoreElements();) {
            InetAddress addr = (InetAddress) en2.nextElement();
            if (!addr.isLoopbackAddress()) {
                if (addr instanceof Inet4Address) {
                    if (preferIPv6) {
                        continue;
                    }
                    return addr;
                }
                if (addr instanceof Inet6Address) {
                    if (preferIpv4) {
                        continue;
                    }
                    return addr;
                }
            }
        }
    }
    return null;
}

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