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Copy a folder to another folder

Posted on 2002-07-11
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Last Modified: 2010-03-31
Can you write a function that would copy all the contents of a folder, files and subfolders included, to another folder?


Something like:
copyFolder("\\test1","\\test2"); <==>Copy the content of directory test1 to test2.
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Question by:yes4me
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3 Comments
 
LVL 1

Expert Comment

by:klf
ID: 7148198
below is some code to get you started. I tested this on Linux.

import java.lang.*;
import java.io.*;

public class Copy
{
    public static void main(String[] argv)
     throws Exception
    {
     if (argv.length != 2) {
         System.err.println("usage: Copy from_file to_file\n");
     }
     copy(new File(argv[0]), new File(argv[1]));
    }

    public static void copy(File from, File to)
     throws Exception
    {
     if (from.equals(to)) {
         throw new Exception(from.getName() + " and " + to.getName() +
                    " are the same file");
     }
     if (from.isDirectory()) {
         copyDir(from, to);
     } else {
         copyFile(from, to);
     }
    }

    public static void copyDir(File from, File to)
     throws Exception
    {
     System.err.println("creating dir: " + to.getPath());
     to.mkdirs();
     File[] files = from.listFiles();
     for (int i = 0; i < files.length; i++) {
         File tmpTo = new File(to, files[i].getName());
         copy(files[i], tmpTo);
     }
    }

    public static void copyFile(File from, File to)
     throws Exception
    {
     System.err.println("copy: " + from.getPath() + " -> " + to.getPath());
     byte[] buf = new byte[4096];
     FileInputStream fis = new FileInputStream(from);
     FileOutputStream fos = new FileOutputStream(to);
     int i = 0;
     do {
         i = fis.read(buf);
         if (i != -1) {
          fos.write(buf, 0, i);
         }
     } while (i != -1);
     fis.close();
     fos.close();
    }
}










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Accepted Solution

by:
klf earned 400 total points
ID: 7148233
  changed the copyFile to test to see if the from and to are the same.

 public static void copyFile(File from, File to)
     throws Exception
    {
     if (from.equals(to)) {
         throw new Exception(from.getName() + " and " + to.getName() +
                    " are the same file");
     }
     System.err.println("copy: " + from.getPath() + " -> " + to.getPath());
     byte[] buf = new byte[4096];
     FileInputStream fis = new FileInputStream(from);
     FileOutputStream fos = new FileOutputStream(to);
     int i = 0;
     do {
         i = fis.read(buf);
         if (i != -1) {
          fos.write(buf, 0, i);
         }
     } while (i != -1);
     fis.close();
     fos.close();
    }
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Author Comment

by:yes4me
ID: 7149837
Thanks a lot.
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