How to copy an image file.

[moizpalitanawala]

Hello friends,
I want to copy files of extensio .bmp , .png, .tif , etc.

when I execute the following code i get errors in the file copied.

FileReader fr=new FileReader("D:/image.bmp");
BufferedReader br=new BufferedReader( fr);
FileReader fw=new FileWriter("D:/copyImage.bmp") ;
String s;
while((s=br.rea dLine())!=null)
{
fw.write(s);
fw.write(System .getProperty("l ine.separator") );
}

[JosAH]

Don't use Readers and Writers for binary files; use InputStreams and OutputStreams
instead. The first pair handles characters and do quite a bit of conversion (UTF-8
etc.) The second pair handles simple bytes and don't do anything with them.

kind regards,

Jos

[sukatoa]

You may also try FileChannel class together with FileInputStream and FileOutputStrea m.

[BigDaddyLH]

Note, by the way, there's nothing special about this being an "image" file. You question was general to any binary file: for example, how to copy .class files.

[moizpalitanawala]

Thanks for your guidance.
My problem for copying images is solved.
I had used this code for doing that.

FileInputStream fis=new FileInputStream (new File("D:/image.bmp"));
FileOutputStrea m fos=new FilePutputStrea m(new FIle("D:/copyImage.bmp") );
int c;
while((c=fis.re ad())!=-1)
{
fos.write(c);
}

But one more problem arises. The Speed is very slow. When I use this to copy more than 1000-1200 files i.e. more than 200mb It takes around 4-5 min.
spending this much time is not feasible for me.

Is there any other way by which copying of files becomes faster.

Moiz

[BigDaddyLH]

That way will be painfully slow -- you are copying the file directly, one byte at a time. Take a look at the InputStream/OutputStream methods that take an array of bytes. 8K is a good array size -- your code should be 8 thousand times faster!

Sukatoa's suggestion to use file channels is excellent as well. Did you follow his links and read?

[sagarsuman00]

Thanks for your guidance.
My problem for copying images is solved.
I had used this code for doing that.

FileInputStream fis=new FileInputStream (new File("D:/image.bmp"));
FileOutputStrea m fos=new FilePutputStrea m(new FIle("D:/copyImage.bmp") );
int c;
while((c=fis.re ad())!=-1)
{
fos.write(c);
}

But one more problem arises. The Speed is very slow. When I use this to copy more than 1000-1200 files i.e. more than 200mb It takes around 4-5 min.
spending this much time is not feasible for me.

Is there any other way by which copying of files becomes faster.

Moiz

if the size of the file is odd bytes (suppose 51 bytes), how it will successfully copy using integers (because integer is of 4 bytes)?