ip address decimal conversion

// Convert IP addresses of the form 127.0.0.1 to decimal integers, no error handling is done here  
    public static long ipToLong(String strIp) {  
        long[] ip = new long[4];  
        // First find the location of . in the IP address string  
        int position1 = strIp.indexOf(".");  
        int position2 = strIp.indexOf(".", position1 + 1);  
        int position3 = strIp.indexOf(".", position2 + 1);  
        // Convert the string between each . to an integer  
        ip[0] = Long.parseLong(strIp.substring(0, position1));  
        ip[1] = Long.parseLong(strIp.substring(position1 + 1, position2));  
        ip[2] = Long.parseLong(strIp.substring(position2 + 1, position3));  
        ip[3] = Long.parseLong(strIp.substring(position3 + 1));  
        return (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3];  
    }  
  
    // Convert the decimal integer form to an ip address in the form of 127.0.0.1  
    public static String longToIP(long longIp) {  
        StringBuffer sb = new StringBuffer("");  
        // Directly shift right by 24 bits  
        sb.append(String.valueOf((longIp >>> 24)));  
        sb.append(".");  
        // Set high 8 bits to 0, then shift right by 16 bits  
        sb.append(String.valueOf((longIp & 0x00FFFFFF) >>> 16));  
        sb.append(".");  
        // Set high 16 bits to 0, then shift right by 8 bits  
        sb.append(String.valueOf((longIp & 0x0000FFFF) >>> 8));  
        sb.append(".");  
        // set the high 24 position to 0  
        sb.append(String.valueOf((longIp & 0x000000FF)));  
        return sb.toString();  
    }