InternetProtocolUtils.java 文件源码

/**
 * @return {@link StandardProtocolFamily#INET} for IPv4 address or {@link StandardProtocolFamily#INET6} for IPv6 address
 * @throws IllegalArgumentException if the address is neither IPv4 or IPv6
 * @since 1.6
 */
public static ProtocolFamily getProtocolFamily(InetAddress address) {
    if (address.getAddress().length == IP4_BYTES) {
        return StandardProtocolFamily.INET;
    } else if (address.getAddress().length == IP6_BYTES) {
        return StandardProtocolFamily.INET6;
    } else {
        throw new IllegalArgumentException("Can't determine protocol family for address: " + address);
    }
}