ip和long的转换

  public static long ipStrToLong(String ipAddress) {        long[] ip = new long[4];        int i = 0;        for (String ipStr : ipAddress.split("\\.")) {            ip[i++] = Long.parseLong(ipStr);        }        return (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3];    }    public static String ipLongToStr(long ip) {        StringBuilder str = new StringBuilder();        str.append((ip >> 24) & 0xff).append(".")                .append((ip >> 16) & 0xff).append(".")                .append((ip >> 8) & 0xff).append(".")                .append(ip & 0xff);        return str.toString();    }