IP地址转换与子网划分-优快云博客

本文链接：https://blog.youkuaiyun.com/Software_King/article/details/84813909
public class IpUtis {

    /**
     * 把long类型的Ip转为一般Ip类型：xx.xx.xx.xx
     * 
     * @param ip
     * @return
     */
    public static String getIpFromLong(Long ip) {
        String s1 = String.valueOf((ip & 4278190080L) / 16777216L);
        String s2 = String.valueOf((ip & 16711680L) / 65536L);
        String s3 = String.valueOf((ip & 65280L) / 256L);
        String s4 = String.valueOf(ip & 255L);
        return s1 + "." + s2 + "." + s3 + "." + s4;
    }

    /**
     * 把xx.xx.xx.xx类型的转为long类型的
     * 
     * @param ip
     * @return
     */
    public static Long getIpFromString(String ip) {
        Long ipLong = 0L;
        String ipTemp = ip;
        ipLong = ipLong * 256 + Long.parseLong(ipTemp.substring(0, ipTemp.indexOf(".")));
        ipTemp = ipTemp.substring(ipTemp.indexOf(".") + 1, ipTemp.length());
        ipLong = ipLong * 256 + Long.parseLong(ipTemp.substring(0, ipTemp.indexOf(".")));
        ipTemp = ipTemp.substring(ipTemp.indexOf(".") + 1, ipTemp.length());
        ipLong = ipLong * 256 + Long.parseLong(ipTemp.substring(0, ipTemp.indexOf(".")));
        ipTemp = ipTemp.substring(ipTemp.indexOf(".") + 1, ipTemp.length());
        ipLong = ipLong * 256 + Long.parseLong(ipTemp);
        return ipLong;
    }

    /**
     * 根据掩码位获取掩码
     * 
     * @param maskBit 掩码位数，如"28"、"30"
     * @return
     */
    public static String getMaskByMaskBit(String maskBit) {
        return StringUtils.isEmpty(maskBit) ? "error, maskBit is null !" : maskBitMap().get(maskBit);
    }

    /**
     * 根据 ip/掩码位 计算IP段的起始IP 如 IP串 218.240.38.69/30
     * 
     * @param ip 给定的IP，如218.240.38.69
     * @param maskBit 给定的掩码位，如30
     * @return 起始IP的字符串表示
     */
    public static String getBeginIpStr(String ip, String maskBit) {
        return getIpFromLong(getBeginIpLong(ip, maskBit));
    }

    /**
     * 根据 ip/掩码位 计算IP段的起始IP 如 IP串 218.240.38.69/30
     * 
     * @param ip 给定的IP，如218.240.38.69
     * @param maskBit 给定的掩码位，如30
     * @return 起始IP的长整型表示
     */
    public static Long getBeginIpLong(String ip, String maskBit) {
        return getIpFromString(ip) & getIpFromString(getMaskByMaskBit(maskBit));
    }

    /**
     * 根据 ip/掩码位 计算IP段的终止IP 如 IP串 218.240.38.69/30
     * 
     * @param ip 给定的IP，如218.240.38.69
     * @param maskBit 给定的掩码位，如30
     * @return 终止IP的字符串表示
     */
    public static String getEndIpStr(String ip, String maskBit) {
        return getIpFromLong(getEndIpLong(ip, maskBit));
    }

    /**
     * 根据 ip/掩码位 计算IP段的终止IP 如 IP串 218.240.38.69/30
     * 
     * @param ip 给定的IP，如218.240.38.69
     * @param maskBit 给定的掩码位，如30
     * @return 终止IP的长整型表示
     */
    public static Long getEndIpLong(String ip, String maskBit) {
        return getBeginIpLong(ip, maskBit) + ~getIpFromString(getMaskByMaskBit(maskBit));
    }

    /**
     * 根据子网掩码转换为掩码位 如 255.255.255.252转换为掩码位 为 30
     * 
     * @param netmarks
     * @return
     */
    public static int getNetMask(String netmarks) {
        StringBuffer sbf;
        String str;
        int inetmask = 0, count = 0;
        String[] ipList = netmarks.split("\\.");
        for (int n = 0; n < ipList.length; n++) {
            sbf = toBin(Integer.parseInt(ipList[n]));
            str = sbf.reverse().toString();
            count = 0;
            for (int i = 0; i < str.length(); i++) {
                i = str.indexOf('1', i);
                if (i == -1) {
                    break;
                }
                count++;
            }
            inetmask += count;
        }
        return inetmask;
    }

    /**
     * 计算子网大小
     * 
     * @param netmask 掩码位
     * @return
     */
    public static int getPoolMax(int maskBit) {
        if (maskBit <= 0 || maskBit >= 32) {
            return 0;
        }
        return (int) Math.pow(2, 32 - maskBit) - 2;
    }

    private static StringBuffer toBin(int x) {
        StringBuffer result = new StringBuffer();
        result.append(x % 2);
        x /= 2;
        while (x > 0) {
            result.append(x % 2);
            x /= 2;
        }
        return result;
    }

    /*
     * 存储着所有的掩码位及对应的掩码 key:掩码位 value:掩码（x.x.x.x）
     */
    private static Map<String, String> maskBitMap() {
        Map<String, String> maskBit = new HashMap<String, String>();
        maskBit.put("1", "128.0.0.0");
        maskBit.put("2", "192.0.0.0");
        maskBit.put("3", "224.0.0.0");
        maskBit.put("4", "240.0.0.0");
        maskBit.put("5", "248.0.0.0");
        maskBit.put("6", "252.0.0.0");
        maskBit.put("7", "254.0.0.0");
        maskBit.put("8", "255.0.0.0");
        maskBit.put("9", "255.128.0.0");
        maskBit.put("10", "255.192.0.0");
        maskBit.put("11", "255.224.0.0");
        maskBit.put("12", "255.240.0.0");
        maskBit.put("13", "255.248.0.0");
        maskBit.put("14", "255.252.0.0");
        maskBit.put("15", "255.254.0.0");
        maskBit.put("16", "255.255.0.0");
        maskBit.put("17", "255.255.128.0");
        maskBit.put("18", "255.255.192.0");
        maskBit.put("19", "255.255.224.0");
        maskBit.put("20", "255.255.240.0");
        maskBit.put("21", "255.255.248.0");
        maskBit.put("22", "255.255.252.0");
        maskBit.put("23", "255.255.254.0");
        maskBit.put("24", "255.255.255.0");
        maskBit.put("25", "255.255.255.128");
        maskBit.put("26", "255.255.255.192");
        maskBit.put("27", "255.255.255.224");
        maskBit.put("28", "255.255.255.240");
        maskBit.put("29", "255.255.255.248");
        maskBit.put("30", "255.255.255.252");
        maskBit.put("31", "255.255.255.254");
        maskBit.put("32", "255.255.255.255");
        return maskBit;
    }

    /**
     * 判断某个ip是否在一个网段内 ip/mask IP+掩码
     */
    public static boolean isInRange(String ip, String cidr) {
        String[] ips = ip.split("\\.");
        int ipAddr = (Integer.parseInt(ips[0]) << 24) | (Integer.parseInt(ips[1]) << 16)
                | (Integer.parseInt(ips[2]) << 8) | Integer.parseInt(ips[3]);
        int type = Integer.parseInt(cidr.replaceAll(".*/", ""));
        int mask = 0xFFFFFFFF << (32 - type);
        String cidrIp = cidr.replaceAll("/.*", "");
        String[] cidrIps = cidrIp.split("\\.");
        int cidrIpAddr = (Integer.parseInt(cidrIps[0]) << 24) | (Integer.parseInt(cidrIps[1]) << 16)
                | (Integer.parseInt(cidrIps[2]) << 8) | Integer.parseInt(cidrIps[3]);

        return (ipAddr & mask) == (cidrIpAddr & mask);
    }

    /**
     * 判断IP地址是否内网IP
     * 
     * @param ipAddress
     * @return
     */
    public static boolean isInnerIP(String ipAddress) {
        boolean isInnerIp = false;
        long ipNum = getIpNum(ipAddress);
        /**
         * 私有IP：A类 10.0.0.0-10.255.255.255 B类 172.16.0.0-172.31.255.255 C类 192.168.0.0-192.168.255.255 当然，还有127这个网段是环回地址
         **/
        long aBegin = getIpNum("10.0.0.0");
        long aEnd = getIpNum("10.255.255.255");
        long bBegin = getIpNum("172.16.0.0");
        long bEnd = getIpNum("172.31.255.255");
        long cBegin = getIpNum("192.168.0.0");
        long cEnd = getIpNum("192.168.255.255");
        isInnerIp = isInner(ipNum, aBegin, aEnd) || isInner(ipNum, bBegin, bEnd) || isInner(ipNum, cBegin, cEnd)
                || ipAddress.equals("127.0.0.1");
        return isInnerIp;
    }

    private static long getIpNum(String ipAddress) {
        String[] ip = ipAddress.split("\\.");
        long a = Integer.parseInt(ip[0]);
        long b = Integer.parseInt(ip[1]);
        long c = Integer.parseInt(ip[2]);
        long d = Integer.parseInt(ip[3]);

        long ipNum = a * 256 * 256 * 256 + b * 256 * 256 + c * 256 + d;
        return ipNum;
    }

    private static boolean isInner(long userIp, long begin, long end) {
        return (userIp >= begin) && (userIp <= end);
    }

    /**
     * 将127.0.0.1 形式的IP地址转换成10进制整数
     * 
     * @param strIP
     * @return
     */
    public static long ipToTenLong(String strIP) {
        long[] ip = new long[4];
        // 先找到IP地址字符串中.的位置
        int position1 = strIP.indexOf(".");
        int position2 = strIP.indexOf(".", position1 + 1);
        int position3 = strIP.indexOf(".", position2 + 1);
        // 将每个.之间的字符串转换成整型
        ip[0] = Long.parseLong(strIP.substring(0, position1));
        ip[1] = Long.parseLong(strIP.substring(position1 + 1, position2));
        ip[2] = Long.parseLong(strIP.substring(position2 + 1, position3));
        ip[3] = Long.parseLong(strIP.substring(position3 + 1));
        return (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3];
    }

    public static String ipToTwoString(String strIP) {
        long[] ip = new long[4];
        // 先找到IP地址字符串中.的位置
        int position1 = strIP.indexOf(".");
        int position2 = strIP.indexOf(".", position1 + 1);
        int position3 = strIP.indexOf(".", position2 + 1);
        // 将每个.之间的字符串转换成整型
        ip[0] = Long.parseLong(strIP.substring(0, position1));
        ip[1] = Long.parseLong(strIP.substring(position1 + 1, position2));
        ip[2] = Long.parseLong(strIP.substring(position2 + 1, position3));
        ip[3] = Long.parseLong(strIP.substring(position3 + 1));
        Long ten = (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3];
        return Long.toBinaryString(ten);
    }

    /**
     * 将10进制整数形式转换成127.0.0.1形式的IP地址
     * 
     * @param longIP
     * @return
     */
    public static String tenLongToIP(long longIP) {
        StringBuffer sb = new StringBuffer("");
        // 直接右移24位
        sb.append(String.valueOf(longIP >>> 24));
        sb.append(".");
        // 将高8位置0，然后右移16位
        sb.append(String.valueOf((longIP & 0x00FFFFFF) >>> 16));
        sb.append(".");
        sb.append(String.valueOf((longIP & 0x0000FFFF) >>> 8));
        sb.append(".");
        sb.append(String.valueOf(longIP & 0x000000FF));
        return sb.toString();
    }

}
Ip处理工具类
