仅在 java 中获取 eth0 接口的 IP 地址 return IPv6 地址而不是 IPv4

Question

我写了下面的代码来获取我在机器上使用的 eth0 接口的 IPv4 地址。但是代码只找到 fe80:x:x:x:xxx:xxxx:xxxx:xxxx ，因为我正在寻找 IPv4 地址，所以没有返回。

这是代码。

    interfaceName = "eth0";
    NetworkInterface networkInterface = NetworkInterface.getByName(interfaceName);
    Enumeration<InetAddress> inetAddress = networkInterface.getInetAddresses();
    InetAddress currentAddress;
    currentAddress = inetAddress.nextElement();
    while(inetAddress.hasMoreElements())
    {
        System.out.println(currentAddress);
        if(currentAddress instanceof Inet4Address && !currentAddress.isLoopbackAddress())
        {
            ip = currentAddress.toString();
            break;
        }
        currentAddress = inetAddress.nextElement();
    }

Answer 1

它弄乱了获取下一个元素的逻辑。在 while 比较运行之前，我得到了 inetAddress 下一个元素。从而使没有更多的元素。

下面的代码已经修复了逻辑

    interfaceName = "eth0";
    NetworkInterface networkInterface = NetworkInterface.getByName(interfaceName);
    Enumeration<InetAddress> inetAddress = networkInterface.getInetAddresses();
    InetAddress currentAddress;
    currentAddress = inetAddress.nextElement();
    while(inetAddress.hasMoreElements())
    {
        currentAddress = inetAddress.nextElement();
        if(currentAddress instanceof Inet4Address && !currentAddress.isLoopbackAddress())
        {
            ip = currentAddress.toString();
            break;
        }
    }

仅在 java 中获取 eth0 接口的 IP 地址 return IPv6 地址而不是 IPv4

Getting the ip address of eth0 interface in java only return IPv6 address and not IPv4

java

ipv4

inetaddress

network-interface