java - 查找本地机器 IP 地址，无误报

Question

我尝试使用 Java 查找我的 PC 的本地 IP 地址。然而，结果并不正确。具体来说，我需要通过 ipconfig 命令获取无线 LAN 适配器 WiFi IPv4 地址。我查看了许多不同的问题，例如 this excellent answer但目前还不清楚如何在 Java 中做到这一点。 InetAddress.getLocalHost() 返回错误的 IP(“以太网适配器 VirtualBox 仅主机网络”)。

我尝试了以下代码:

public static List<String> getLocalIPAddresses() throws Exception
{
    val networkInterfaces = NetworkInterface.getNetworkInterfaces();
    val localIPAddresses = new ArrayList<String>();

    while (networkInterfaces.hasMoreElements())
    {
        for (val interfaceAddress : networkInterfaces.nextElement().getInterfaceAddresses())
        {
            val address = interfaceAddress.getAddress();

            // Find the local IP addresses
            if (address.isSiteLocalAddress())
            {
                val localIPAddress = interfaceAddress.getAddress().toString().replace("/", "");
                localIPAddresses.add(localIPAddress);
            }
        }
    }

    if (localIPAddresses.isEmpty())
    {
        throw new IllegalStateException("Expected the computer's local IP address but didn't get one!");
    }

    return localIPAddresses;
}

注意:
val 来自Lombok .

在我的机器上，这会返回 2 个 IP 地址的列表:

192.168.56.1
192.168.2.103

“以太网适配器 VirtualBox 仅主机网络”和正确的“无线 LAN 适配器 WiFi”。我可以做什么来始终保证后者？显然检查 isSiteLocalAddress() (又名本地 IP 地址)是不够的。代码方面还可以做什么？过滤掉“VirtualBox”并不是一个万无一失的解决方案，特别是因为网络接口(interface)名称与语言相关:

public static List<String> getLocalIPAddresses() throws Exception
{
    val networkInterfaces = NetworkInterface.getNetworkInterfaces();
    val localIPAddresses = new ArrayList<String>();

    while (networkInterfaces.hasMoreElements())
    {
        val networkInterface = networkInterfaces.nextElement();
        val displayName = networkInterface.getDisplayName();

        if (!displayName.contains("VirtualBox"))
        {
            for (val interfaceAddress : networkInterface.getInterfaceAddresses())
            {
                val address = interfaceAddress.getAddress();

                // Find the local IP addresses
                if (address.isSiteLocalAddress())
                {
                    val localIPAddress = interfaceAddress.getAddress().toString().replace("/", "");
                    localIPAddresses.add(localIPAddress);
                }
            }
        }
    }

    if (localIPAddresses.isEmpty())
    {
        throw new IllegalStateException("Expected the computer's local IP address but didn't get one!");
    }

    return localIPAddresses;
}

我需要一个独立于平台的解决方案。不过我用的是 Windows。

Answer 1

为什么不使用 isVirtual() 方法。

static List<String> getLocalIpAddress() throws SocketException {
    Enumeration<NetworkInterface> networkInterfaces = null;
    List<String> localIpAddress = new ArrayList<String>();

    networkInterfaces = NetworkInterface.getNetworkInterfaces();

    while (networkInterfaces.hasMoreElements()) {
        NetworkInterface ni = networkInterfaces.nextElement();
        System.out.println("=== <" + ni.getDisplayName() + "> ===");

        if (!ni.isUp()) {
            for (InterfaceAddress addr : ni.getInterfaceAddresses()) {
                System.out.println("not up : " + addr.getAddress().getHostAddress());
            }
            continue;
        }
        if (ni.isLoopback()) {
            for (InterfaceAddress addr : ni.getInterfaceAddresses()) {
                System.out.println("loopback : " + addr.getAddress().getHostAddress());
            }
            continue;
        }
        if (ni.isVirtual()) {
            for (InterfaceAddress addr : ni.getInterfaceAddresses()) {
                System.out.println("virtual : " + addr.getAddress().getHostAddress());
            }
            continue;
        }

        if (!ni.isPointToPoint()) {
            for (InterfaceAddress addr : ni.getInterfaceAddresses()) {
                System.out.println("not ppp : " + addr.getAddress().getHostAddress());
            }
            continue;
        }

        for (InterfaceAddress addr : ni.getInterfaceAddresses()) {
            InetAddress address = addr.getAddress();
            if (address.isLinkLocalAddress()) {
                System.out.println("link local address: " + address.getHostName() + address.getHostAddress());
                continue;
            }
            if (address.isSiteLocalAddress()) {
                System.out.println("site local address: " + address.getHostName() + address.getHostAddress());
                continue;
            }

            System.out.println("getHostName: " + address.getHostName());
            System.out.println("getHostAddress : " + address.getHostAddress());
            System.out.println("------separator-------");

            localIpAddress.add(address.getHostAddress());
        }
    }

    return localIpAddress;
}