Copying JPEG from one file to another?

[Brian Snyder]

Hi all,
Can someone kindly point me in the correct direction? I need to copy a JPEG from one file folder to another. It seems so basic, but yet, I can't get it going.
Thanks in advance!!
Brian

[Nathan Pruett]

First you click on the 'My Computer' icon up in the corner of your screen, open up the folder the JPEG file is stored in, and then drag the file.... Oh, wait... you mean in Java...

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
 
public class FileMover
{
    public static void main( String[] args )
    {
        String path1 = "C:\\oldDir";
        String filename = "cube2.jpg";
        String path2 = "C:\\newDir";
 
        File oldFile = new File( path1, filename );
        File newFile = new File( path2, filename );
 
        try
        {
            FileInputStream fis = new FileInputStream( oldFile );
            FileOutputStream fos = new FileOutputStream( newFile );
 
            try
            {
                int currentByte = fis.read();
                while( currentByte != -1 )
                {
                   fos.write( currentByte );
                   currentByte = fis.read();
                }
            }
            catch( IOException exception )
            {
                System.err.println( "IOException occurred!" );
                exception.printStackTrace();
            }
            finally
            {
                fis.close();
                fos.close();
                System.out.println( "Copied file!" );
            }
        }
        catch( IOException exception )
        {
            System.err.println( "Problems with files!" );
            exception.printStackTrace();
        }
    }
}

HTH,
-Nate

[Brian Snyder]

Thanks Nate!!!
That did the trick.
I like your joke....it was quite amusing.
Regards,
Brian

[Brian Snyder]

Hi Nate or whomever else.....
I am now able to successfully copy a JPEG file from one filefolder to another....BUT......
The only problem is that it is SLOW!!! I put the code used to copy the file into a thread figuring it shouldn't take away from CPU time, but I still find that the program must wait until the copying is done before the user can do something else.
Any ideas on increasing speed??? Many thanks in adbance.

[Gregg Bolinger]

This is faster. I had the same problem. This should fix it. Replace your code with:

try{



        File ee = (myImage); 
        File eee = new File("somefile.jpg"); 
        
        FileInputStream eeee = new FileInputStream(ee); 
        FileOutputStream eeeee = new FileOutputStream(eee); 

        System.out.println(ee.length());
        
        
        try {
        int currentbyte = eeee.read();
        while (currentbyte != -1) {
        eeeee.write (currentbyte);
        currentbyte = eeee.read();
        }
        }catch (IOException blabla){ }
        
        
        
        
        eeee.close(); 
        eeeee.close(); 
}catch(IOException eeha){} 

------------------
Happy Coding,
Gregg Bolinger

[Brian Snyder]

Thanks Gregg..
That did make a big difference. There's still some delay, but not as much as before. Good tip. I hope to return the favor.
Brian

[Brian Snyder]

I'm back looking for another answer. I have 225 JPEG's that need to be copied. Using the above code takes about 5 MINUTES or more to do the job. When using My Computer in Windows it takes less than 1 minute.
There has to be an easier way.
I have used

oldfile.renameTo(newFile);

That is quick. The only problem is that the old file obviously
gets removed. How do I 'copy' and not just 'cut and paste' my JPEGS?
Many thanks in advance!

[gautham kasinath]

Hi!
Well have you tried to read the file by a kb??
Read instead of one byte each time the loop executes.. try reading a KB.. 1024 bytes..
that helps in speed coz it helped me on my winnt 4.0 ws
Regds
Gautham Kasinath

[Gregg Bolinger]

Could you show a code sample of that? Sounds like a dandy idea.

------------------
Happy Coding,
Gregg Bolinger

[Brian Snyder]

Hi Gautham,
Thanks for your reply. Does copying more than one byte at a time lose picture quality? Could you send me some code as well with your example so I can try it out?
Many thanks in advance.
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