try(FileInputStream fin=new FileInputStream("c:/ru_domains.txt"))
        {
            System.out.println("Размер файла: " + fin.available() + " байт(а)");
            
            String all_fl = "";
            double i=-1, all_str = 0, procent = 0;
            procent = Math.abs((fin.available()/100));
            
            while((i=fin.read())!=-1){
                all_fl = all_fl + (char)i;
                all_str = all_str + 1;
                
                //System.out.println(all_str);
                
                if ((all_str % procent) == 0) {
                    System.out.println((all_str/procent)+ "%");
                    }
                //System.out.print((char)i);
            }   
        }
        catch(IOException ex){
            System.out.println(ex); 
            System.out.println(ex.getMessage());
        } 
        
        System.out.println("Конец");