IP地址（IPV6）与long数组之间的转换

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/**
 * 将 IPv6 地址转为 long 数组，只支持冒分十六进制表示法
 */
public static long[] ipv6ToLongs(String ipv6_string) {
	if (ipv6_string == null || ipv6_string.isEmpty()) {
		throw new IllegalArgumentException("ipv6_string cannot be null.");
	}

	String[] ipSlices = ipv6_string.split(":");
	if (ipSlices.length != 8) {
		throw new IllegalArgumentException(ipv6_string + " is not an ipv6 address.");
	}

	long[] ipv6 = new long[2];
	for (int i = 0; i < 8; i++) {
		String slice = ipSlices[i];
		
		// 以 16 进制解析
		long num = Long.parseLong(slice, 16);
		
		// 每组 16 位
		long right = num << (16 * i);
		
		// 每个 long 保存四组，i >> 2 等于 i / 4
		int length=i>>2;//即int length=i / 4;
		ipv6[length] = ipv6[length] | right;
	}

	return ipv6;
}

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/**
 * 将 long 数组转为冒分十六进制表示法的 IPv6 地址
 */
public static String longsToIpv6(long[] numbers) {
	if (numbers == null || numbers.length != 2) {
		throw new IllegalArgumentException(Arrays.toString(numbers) + " is not an IPv6 address.");
	}

	StringBuilder sb = new StringBuilder(32);
	for (long numSlice : numbers) {
		// 每个 long 保存四组
		for (int j = 0; j < 4; j++) {
			// 取最后 16 位
			long current = numSlice & 0xFFFF;
			sb.append(Long.toString(current, 16)).append(":");
			// 右移 16 位，即去除掉已经处理过的 16 位
			numSlice >>= 16;
		}
	}
	
	// 去掉最后的 :
	return sb.substring(0, sb.length() - 1);
	}
}

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public static void main(String[] args) {
	String ipv6_string = "FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF";
		
	long[] ipv6_longs = ipv6ToLongs(ipv6_string);
	System.out.println(ipv6_string + "对应的long数组为：(" + ipv6_longs[0]+"，"+ipv6_longs[1]+")");

	System.out.println("("+ipv6_longs[0]+"，"+ipv6_longs[1] + ")对应的ip值为：" + longsToIpv6(ipv6_longs ));
}

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FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF对应的long数组为：(-1，-1)

(-1，-1)对应的ip值为：ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff