• JAVA中IP和整数相互转化(含有掩码的计算)


    import java.net.InetAddress;
    /**
     * 用于IP和整数之间的相互转换
     * @author Andy.Wang
     *
     */
    public class IPv4Util {
        private final static int INADDRSZ = 4;
        /**
         * 把IP地址转化为字节数组
         * @param ipAddr
         * @return byte[]
         */
        public static byte[] ipToBytesByInet(String ipAddr) {
            try {
                return InetAddress.getByName(ipAddr).getAddress();
            } catch (Exception e) {
                throw new IllegalArgumentException(ipAddr + " is invalid IP");
            }
        }
        /**
         * 把IP地址转化为int
         * @param ipAddr
         * @return int
         */
        public static byte[] ipToBytesByReg(String ipAddr) {
            byte[] ret = new byte[4];
            try {
                String[] ipArr = ipAddr.split("\.");
                ret[0] = (byte) (Integer.parseInt(ipArr[0]) & 0xFF);
                ret[1] = (byte) (Integer.parseInt(ipArr[1]) & 0xFF);
                ret[2] = (byte) (Integer.parseInt(ipArr[2]) & 0xFF);
                ret[3] = (byte) (Integer.parseInt(ipArr[3]) & 0xFF);
                return ret;
            } catch (Exception e) {
                throw new IllegalArgumentException(ipAddr + " is invalid IP");
            }
        }
        /**
         * 字节数组转化为IP
         * @param bytes
         * @return int
         */
        public static String bytesToIp(byte[] bytes) {
            return new StringBuffer().append(bytes[0] & 0xFF).append('.').append(
                    bytes[1] & 0xFF).append('.').append(bytes[2] & 0xFF)
                    .append('.').append(bytes[3] & 0xFF).toString();
        }
        /**
         * 根据位运算把 byte[] -> int
         * @param bytes
         * @return int
         */
        public static int bytesToInt(byte[] bytes) {
            int addr = bytes[3] & 0xFF;
            addr |= ((bytes[2] << 8) & 0xFF00);
            addr |= ((bytes[1] << 16) & 0xFF0000);
            addr |= ((bytes[0] << 24) & 0xFF000000);
            return addr;
        }
        /**
         * 把IP地址转化为int
         * @param ipAddr
         * @return int
         */
        public static int ipToInt(String ipAddr) {
            try {
                return bytesToInt(ipToBytesByInet(ipAddr));
            } catch (Exception e) {
                throw new IllegalArgumentException(ipAddr + " is invalid IP");
            }
        }
        /**
         * ipInt -> byte[]
         * @param ipInt
         * @return byte[]
         */
        public static byte[] intToBytes(int ipInt) {
            byte[] ipAddr = new byte[INADDRSZ];
            ipAddr[0] = (byte) ((ipInt >>> 24) & 0xFF);
            ipAddr[1] = (byte) ((ipInt >>> 16) & 0xFF);
            ipAddr[2] = (byte) ((ipInt >>> 8) & 0xFF);
            ipAddr[3] = (byte) (ipInt & 0xFF);
            return ipAddr;
        }
        /**
         * 把int->ip地址
         * @param ipInt
         * @return String
         */
        public static String intToIp(int ipInt) {
            return new StringBuilder().append(((ipInt >> 24) & 0xff)).append('.')
                    .append((ipInt >> 16) & 0xff).append('.').append(
                            (ipInt >> 8) & 0xff).append('.').append((ipInt & 0xff))
                    .toString();
        }
        /**
         * 把192.168.1.1/24 转化为int数组范围
         * @param ipAndMask
         * @return int[]
         */
        public static int[] getIPIntScope(String ipAndMask) {
            String[] ipArr = ipAndMask.split("/");
            if (ipArr.length != 2) {
                throw new IllegalArgumentException("invalid ipAndMask with: "
                        + ipAndMask);
            }
            int netMask = Integer.valueOf(ipArr[1].trim());
            if (netMask < 0 || netMask > 31) {
                throw new IllegalArgumentException("invalid ipAndMask with: "
                        + ipAndMask);
            }
            int ipInt = IPv4Util.ipToInt(ipArr[0]);
            int netIP = ipInt & (0xFFFFFFFF << (32 - netMask));
            int hostScope = (0xFFFFFFFF >>> netMask);
            return new int[] { netIP, netIP + hostScope };
        }
        /**
         * 把192.168.1.1/24 转化为IP数组范围
         * @param ipAndMask
         * @return String[]
         */
        public static String[] getIPAddrScope(String ipAndMask) {
            int[] ipIntArr = IPv4Util.getIPIntScope(ipAndMask);
            return new String[] { IPv4Util.intToIp(ipIntArr[0]),
                    IPv4Util.intToIp(ipIntArr[0]) };
        }
        /**
         * 根据IP 子网掩码(192.168.1.1 255.255.255.0)转化为IP段
         * @param ipAddr ipAddr
         * @param mask mask
         * @return int[]
         */
        public static int[] getIPIntScope(String ipAddr, String mask) {
            int ipInt;
            int netMaskInt = 0, ipcount = 0;
            try {
                ipInt = IPv4Util.ipToInt(ipAddr);
                if (null == mask || "".equals(mask)) {
                    return new int[] { ipInt, ipInt };
                }
                netMaskInt = IPv4Util.ipToInt(mask);
                ipcount = IPv4Util.ipToInt("255.255.255.255") - netMaskInt;
                int netIP = ipInt & netMaskInt;
                int hostScope = netIP + ipcount;
                return new int[] { netIP, hostScope };
            } catch (Exception e) {
                throw new IllegalArgumentException("invalid ip scope express  ip:"
                        + ipAddr + "  mask:" + mask);
            }
        }
        /**
         * 根据IP 子网掩码(192.168.1.1 255.255.255.0)转化为IP段
         * @param ipAddr ipAddr
         * @param mask mask
         * @return String[]
         */
        public static String[] getIPStrScope(String ipAddr, String mask) {
            int[] ipIntArr = IPv4Util.getIPIntScope(ipAddr, mask);
            return new String[] { IPv4Util.intToIp(ipIntArr[0]),
                    IPv4Util.intToIp(ipIntArr[0]) };
        }
        /**
         * @param args
         * @throws Exception
         */
        public static void main(String[] args) throws Exception {
            String ipAddr = "192.168.8.1";
            byte[] bytearr = IPv4Util.ipToBytesByInet(ipAddr);
            StringBuffer byteStr = new StringBuffer();
            for (byte b : bytearr) {
                if (byteStr.length() == 0) {
                    byteStr.append(b);
                } else {
                    byteStr.append("," + b);
                }
            }
            System.out.println("IP: " + ipAddr + " ByInet --> byte[]: [ " + byteStr
                    + " ]");
            bytearr = IPv4Util.ipToBytesByReg(ipAddr);
            byteStr = new StringBuffer();
            for (byte b : bytearr) {
                if (byteStr.length() == 0) {
                    byteStr.append(b);
                } else {
                    byteStr.append("," + b);
                }
            }
            System.out.println("IP: " + ipAddr + " ByReg  --> byte[]: [ " + byteStr
                    + " ]");
            System.out.println("byte[]: " + byteStr + " --> IP: "
                    + IPv4Util.bytesToIp(bytearr));
            int ipInt = IPv4Util.ipToInt(ipAddr);
            System.out.println("IP: " + ipAddr + "  --> int: " + ipInt);
            System.out.println("int: " + ipInt + " --> IP: "
                    + IPv4Util.intToIp(ipInt));
            String ipAndMask = "192.168.1.1/24";
            int[] ipscope = IPv4Util.getIPIntScope(ipAndMask);
            System.out.println(ipAndMask + " --> int地址段:[ " + ipscope[0] + ","
                    + ipscope[1] + " ]");
            System.out.println(ipAndMask + " --> IP 地址段:[ "
                    + IPv4Util.intToIp(ipscope[0]) + ","
                    + IPv4Util.intToIp(ipscope[1]) + " ]");
            String ipAddr1 = "192.168.1.1", ipMask1 = "255.255.255.0";
            int[] ipscope1 = IPv4Util.getIPIntScope(ipAddr1, ipMask1);
            System.out.println(ipAddr1 + " , " + ipMask1 + "  --> int地址段 :[ "
                    + ipscope1[0] + "," + ipscope1[1] + " ]");
            System.out.println(ipAddr1 + " , " + ipMask1 + "  --> IP地址段 :[ "
                    + IPv4Util.intToIp(ipscope1[0]) + ","
                    + IPv4Util.intToIp(ipscope1[1]) + " ]");
        }
    }

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  • 原文地址:https://www.cnblogs.com/yaomajor/p/5995766.html
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