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));
}

}