IO COAUCO

InputStream iStream=new FileInputStream("F://cat.jpg");
    OutputStream outputStream=new FileOutputStream("F://gg.jpg");
    byte [] buff=new byte[iStream.available()];
    while(true)
    {
     int n=iStream.read(buff);
     outputStream.write(buff);
     if(n<1024)
     {
    break;
     }
   
    }
    outputStream.flush();
    outputStream.close();
    iStream.close();