java 根据ipv6范围获取ip数量

可以使用Java中的`Inet6Address`类来获取IPv6范围内的IP数量。以下是一个示例代码：

import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.math.BigInteger;

public class IPv6RangeCalculator {
    public static void main(String[] args) {
        String startAddress = "fe80::1";
        String endAddress = "fe80::ffff:ffff:ffff:ffff";
        try {
            InetAddress start = InetAddress.getByName(startAddress);
            InetAddress end = InetAddress.getByName(endAddress);

            BigInteger startInt = new BigInteger(1, ((Inet6Address) start).getAddress());
            BigInteger endInt = new BigInteger(1, ((Inet6Address) end).getAddress());

            BigInteger diff = endInt.subtract(startInt);
            BigInteger numAddresses = diff.add(BigInteger.ONE);

            System.out.println("Number of addresses in range: " + numAddresses);
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }
}

在上面的示例中，我们首先将起始和结束IPv6地址转换为`InetAddress`对象。然后，我们将这些对象转换为`Inet6Address`对象，并将它们的IP地址转换为一个大整数。最后，我们计算两个整数之间的差异并添加1，以获取IPv6范围内的IP数量。