java 根据ipv6和掩码，获取所有ipv6

可以使用Java的InetAddress类来获取指定IPv6地址和掩码下的所有IPv6地址。以下是一个示例代码：

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;

public class IPv6Generator {
    public static void main(String[] args) {
        String ipv6Address = "2001:0db8:85a3:0000:0000:8a2e:0370:7334";
        int prefixLength = 64;

        try {
            InetAddress inetAddress = InetAddress.getByName(ipv6Address);
            byte[] address = inetAddress.getAddress();

            // Convert prefix length to number of bits
            int numBits = prefixLength / 8;
            int remainingBits = prefixLength % 8;

            // Generate all possible addresses based on prefix length
            List<String> addresses = new ArrayList<>();
            generateAddresses(address, numBits, remainingBits, addresses);

            // Print generated addresses
            for (String addr : addresses) {
                System.out.println(addr);
            }
        } catch (UnknownHostException ex) {
            ex.printStackTrace();
        }
    }

    private static void generateAddresses(byte[] address, int numBits, int remainingBits, List<String> addresses) {
        if (numBits == 16) {
            // All 128 bits have been set, add address to list
            addresses.add(formatAddress(address));
            return;
        }

        // Calculate next bit to set
        int bitIndex = numBits * 8 + remainingBits;

        if (remainingBits == 0) {
            // Set all bits for this byte
            address[numBits] = (byte) 0xff;
            generateAddresses(address, numBits + 1, 0, addresses);
            address[numBits] = 0;
            generateAddresses(address, numBits + 1, 0, addresses);
        } else {
            // Set only the specified number of bits for this byte
            int mask = (1 << remainingBits) - 1;
            for (int i = 0; i <= mask; i++) {
                address[numBits] = (byte) (i << (8 - remainingBits));
                generateAddresses(address, numBits, remainingBits - 1, addresses);
                address[numBits] = 0;
            }
        }
    }

    private static String formatAddress(byte[] address) {
        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < address.length; i += 2) {
            builder.append(String.format("%02x%02x", address[i], address[i + 1]));
            if (i < address.length - 2) {
                builder.append(":");
            }
        }
        return builder.toString();
    }
}

需要提供一个IPv6地址和一个前缀长度，该代码将生成所有可能的IPv6地址，并将其打印到控制台上。例如，在一个64位的子网中，给定一个IPv6地址"2001:0db8:85a3:0000:0000:8a2e:0370:7334"，该代码将生成所有可能的IPv6地址。