IP转整数以及整数转IP

Ipv4Util.java

/**
 * 参考：http://aokunsang.iteye.com/blog/622498
 * @author chengyongchun
 * @since 2013-9-24  <br/>
 */
public class Ipv4Util {
    
    public static Long ip2Long(String ipString){
        
        if(ipString==null){
            throw new RuntimeException("ip is null");
        }
            long result = 0;
            StringTokenizer token = new StringTokenizer(ipString,".");
            if(token.countTokens()!=4){
                throw new RuntimeException("invalid ip: " + ipString);
            }
            result |= Long.parseLong(token.nextToken())<<24;
            result |= Long.parseLong(token.nextToken())<<16;
            result |= Long.parseLong(token.nextToken())<<8;
            result |= Long.parseLong(token.nextToken());
            return result;
        
    }
    
    
    public static String long2Ip(long ipLong){
        StringBuilder sb = new StringBuilder();
        sb.append(ipLong>>>24);
        sb.append(".");
        sb.append(String.valueOf((ipLong>>>16)&0xFF));
        sb.append(".");
        sb.append(String.valueOf((ipLong>>>8)&0xFF));
        sb.append(".");
        sb.append(String.valueOf(ipLong&0xFF));
        return sb.toString();
    }
    
    public static  boolean isInnerIp(String ipString) {
        
         Long ip = Ipv4Util.ip2Long(ipString);
         Long aBegin = Ipv4Util.ip2Long("10.0.0.0");       // "10.0.0.0"--->10.255.255.255
         Long  aEnd = Ipv4Util.ip2Long("10.255.255.255");       
         Long  bBegin = Ipv4Util.ip2Long("172.16.0.0");     //"172.16.0.0"--->"172.31.255.255" 
         Long  bEnd = Ipv4Util.ip2Long("172.31.255.255");   
         Long  cBegin = Ipv4Util.ip2Long("192.168.0.0");     // "192.168.0.0"--->"192.168.255.255"
         Long  cEnd = Ipv4Util.ip2Long("192.168.255.255");  
        
        return ((ip >= aBegin && ip <= aEnd) ||
                (ip >= bBegin && ip <= bEnd) ||
                (ip >= cBegin && ip <= cEnd));
    }

}