java 判断IP是否符合限定的IP范围内

/* 判断是否是内网IP */
    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;
    }

    /* 获取IP数 */
    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);
    }

    public static void main(String[] args) {  
        String begin = "222.177.202.0";
        String end = "222.177.202.255";
        String userIP = "222.177.202.11";//客户端IP
        long a = getIpNum(begin);
        long b = getIpNum(end);
        long c = getIpNum(userIP);
        if(isInner(Long.valueOf(c),Long.valueOf(a),Long.valueOf(b))){
            System.out.println("在范围内");
        }else{
            System.out.println("在范围外");
        }
    }