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public static long ip2Long(String ipStr){    if(ipStr == null || ipStr.length() == 0){        return 0;    }    int position1 = ipStr.indexOf(".");    int position2 = ipStr.indexOf(".",position1+1);    int position3 = ipStr.indexOf(".",position2+1);    long ip1 = Long.parseLong(ipStr.substring(0,position1));    long ip2 = Long.parseLong(ipStr.substring(position1+1,position2));    long ip3 = Long.parseLong(ipStr.substring(position2+1,position3));    long ip4 = Long.parseLong(ipStr.substring(position3+1));    return (ip1 << 24) + (ip2<<16) +(ip3<<8)+ip4;}public static String long2Ip(long ipLong){    StringBuilder ip = new StringBuilder();    ip.append(String.valueOf((ipLong >>> 24))).append(".");    ip.append(String.valueOf(((ipLong & 0x00FFFFFF) >>> 16))).append(".");    ip.append(String.valueOf(((ipLong & 0x0000FFFF) >>> 8))).append(".");    ip.append(String.valueOf(((ipLong & 0x000000FF))));    return ip.toString();}public static void main(String[] args) {    String ipStr = "192.168.1.1";    long ipLong = ip2Long(ipStr);    System.out.println(ipLong);    String ipStr2 = long2Ip(ipLong);    System.out.println(ipStr2);}

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