检测某个IP是否属于某个网段范围

package codinginterview.search;

public class IpSeeker {

    /*验证IP是否属于某个IP段
     * 
     * ipSection    IP段（以'-'分隔）
     * ip           所验证的IP号码
     * 
     */
    public static boolean ipExistsInRange(String ip,String ipSection) {
        ipSection = ipSection.trim();
        ip = ip.trim();
        int idx = ipSection.indexOf('-');
        String beginIP = ipSection.substring(0, idx);
        String endIP = ipSection.substring(idx + 1);
        return getIp2long(beginIP)<=getIp2long(ip) &&getIp2long(ip)<=getIp2long(endIP);
    }


    public static long getIp2long(String ip) {
        ip = ip.trim();
        String[] ips = ip.split("\\.");
        long ip2long = 0L;
        for (int i = 0; i < 4; ++i) {
            ip2long = ip2long << 8 | Integer.parseInt(ips[i]);
        }
        return ip2long;
    }

     public static long getIp2long2(String ip) {
        ip = ip.trim();
        String[] ips = ip.split("\\.");
        long ip1 = Integer.parseInt(ips[0]);
        long ip2 = Integer.parseInt(ips[1]);
        long ip3 = Integer.parseInt(ips[2]);
        long ip4 = Integer.parseInt(ips[3]);

        long ip2long =1L* ip1 * 256 * 256 * 256 + ip2 * 256 * 256 + ip3 * 256 + ip4;
        return ip2long;
    }  

    public static void main(String[] args){
        //10.8.2.7 是否属于固定格式的IP段 9.2.3.100-10.8.3.1
        String ip="10.8.2.7";
        String ipSection="9.2.3.100-10.8.3.1";
        boolean exists=ipExistsInRange(ip,ipSection);
        System.out.println(exists);
        System.out.println(getIp2long(ip));
        System.out.println(getIp2long2(ip));
    }

}