IP 地址工具，用于确定 IP 是否在指定范围内（支持 ipv6）

package com.yk.ip; import java.math.BigInteger; import java.net.InetAddress; import java.net.UnknownHostException; import java.nio.ByteBuffer; import java.util.ArrayList; import java.util.List; public class IpUtil { /** * 判断目标ip是否在ip范围内(起始ip范围),支持ipv6 * @param ipAddress 目标ip * @param startIp 开始ip * @param endIp 结束ip * @return boolean * @throws UnknownHostException 异常 */ public static boolean isInRange(String ipAddress,String startIp,String endIp) throws UnknownHostException { InetAddress address = InetAddress.getByName(ipAddress); InetAddress startAddress = InetAddress.getByName(startIp); InetAddress endAddress = InetAddress.getByName(endIp); BigInteger start = new BigInteger(1, startAddress.getAddress()); BigInteger end = new BigInteger(1, endAddress.getAddress()); BigInteger target = new BigInteger(1, address.getAddress()); int st = start.compareTo(target); int te = target.compareTo(end); return (st <= 0) && (te <= 0); } /** * 判断目标ip是否在ip范围内(掩码),支持ipv6 * @param ipAddress 目标ip * @param ipWithMask 带掩码ip * @return boolean * @throws UnknownHostException 异常 */ public static boolean isInRange(String ipAddress,String ipWithMask) throws UnknownHostException { if (ipWithMask.contains("/")) { String addressPart = ipWithMask.substring(0, ipWithMask.indexOf("/")); String networkPart = ipWithMask.substring(ipWithMask.indexOf("/") + 1); ByteBuffer maskBuffer; int targetSize; InetAddress inetAddress = InetAddress.getByName(addressPart); if (inetAddress.getAddress().length == 4) { maskBuffer = ByteBuffer .allocate(4) .putInt(-1); targetSize = 4; } else { maskBuffer = ByteBuffer.allocate(16) .putLong(-1L) .putLong(-1L); targetSize = 16; } BigInteger mask = (new BigInteger(1, maskBuffer.array())).not().shiftRight(Integer.parseInt(networkPart)); ByteBuffer buffer = ByteBuffer.wrap(inetAddress.getAddress()); BigInteger ipVal = new BigInteger(1, buffer.array()); BigInteger startIp = ipVal.and(mask); BigInteger endIp = startIp.add(mask.not()); byte[] startIpArr = toBytes(startIp.toByteArray(), targetSize); byte[] endIpArr = toBytes(endIp.toByteArray(), targetSize); InetAddress startAddress = InetAddress.getByAddress(startIpArr); InetAddress endAddress = InetAddress.getByAddress(endIpArr); return isInRange(ipAddress, startAddress.getHostAddress(), endAddress.getHostAddress()); } else { throw new IllegalArgumentException("not an valid CIDR format!"); } } private static byte[] toBytes(byte[] array, int targetSize) { int counter = 0; List<Byte> newArr = new ArrayList<Byte>(); while (counter < targetSize && (array.length - 1 - counter >= 0)) { newArr.add(0, array[array.length - 1 - counter]); counter++; } int size = newArr.size(); for (int i = 0; i < (targetSize - size); i++) { newArr.add(0, (byte) 0); } byte[] ret = new byte[newArr.size()]; for (int i = 0; i < newArr.size(); i++) { ret[i] = newArr.get(i); } return ret; } }