ip地址转换成long型整数

String ipToLong(String ip){
        String str = "";
        String[] ips = ip.split("\\.");
        for(int i=0;i<ips.length;i++){
           if(ips[i].length()==3){
               str += ips[i];
               continue;
           }else if(ips[i].length()==2){
               str += "0"+ips[i];
               continue;
           }else if(ips[i].length()==1){
               str += "00"+ips[i];
               continue;
           }else{
               continue;
           }
        }
        return str;
    }