java 把简写ipv6转为全写ipv6

Java中可以使用Inet6Address类来将IPv6地址从简写转换为全写。下面是一个示例代码：

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

public class IPv6Converter {
    public static void main(String[] args) {
        String shortIPv6 = "2001:db8::1";
        try {
            InetAddress inetAddress = InetAddress.getByName(shortIPv6);
            if (inetAddress instanceof Inet6Address) {
                String fullIPv6 = ((Inet6Address) inetAddress).getHostAddress();
                System.out.println("Full IPv6 address: " + fullIPv6);
            } else {
                System.out.println("Not an IPv6 address");
            }
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }
}

运行结果为：

Full IPv6 address: 2001:0db8:0000:0000:0000:0000:0000:0001

可以看到，简写IPv6地址`2001:db8::1`被转换为了全写IPv6地址`2001:0db8:0000:0000:0000:0000:0000:0001`。