IP 与整数互转

  public static long ipToLong(String ipString){
        long result = 0;
        java.util.StringTokenizer token = new java.util.StringTokenizer(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 longToIp(long ipLong){
        StringBuilder sb = new StringBuilder();
        sb.append(ipLong>>>24);sb.append(".");
        sb.append(String.valueOf((ipLong&0x00FFFFFF)>>>16));sb.append(".");
        sb.append(String.valueOf((ipLong&0x0000FFFF)>>>8));sb.append(".");
        sb.append(String.valueOf(ipLong&0x000000FF));
        return sb.toString();
    }

http://aokunsang.iteye.com/blog/622498