How to copy the whole directory including subdirectories and files in java

Question

i have written the code for copying the directory with subdirectories.but directory is copying .but its subdirectories and files are not copying.please tell me how to solve this problem
import java.io.*;
public class copy
private void copyFile(File src, File dst) throws IOException
InputStream in = new FileInputStream(src);
OutputStream out = new FileOutputStream(dst);
// Transfer bytes from in to out
byte[] buf = new byte[1024];
int len;
while ( (len = in.read(buf)) > 0) {
out.write(buf, 0, len);
in.close();
out.close();
public int copyDirectory(File srcDir, File dstDir) throws IOException
if (srcDir.isDirectory())
if (!dstDir.exists())
dstDir.mkdir();
String[] children = srcDir.list();
int c= children.length;
System.out.println(c);
for (int i = 0; i < children.length; i++) {
copyDirectory(new File(srcDir, children),
new File(dstDir, children[i]));
else {
// This method is implemented in e1071 Copying a File
copyFile(srcDir, dstDir);
return 1;
public static void main(String args[]) throws IOException {
copy c = new copy();
c.copyDirectory(new File("d:/puvvada/sub "),new File("d:/sub"));
c.copyFile(new File("d:/puvvada/sub/auth.html"),new File("d:/sub/auth.html")) ;

Answer 1

It is NOT a ""here's my spec". As simple as it is.
And of course I know help here is free as in other thousands of forums
That is not really the issue.  You have already noted that this is not as simple as you thought.  There have been at least three statements in reponse to your request.  The reasons for these statements are that you are asking for someone to
write a script that is not a simple script.  YOu canwrite a script and post it with questions and your questions will be answered.
I posted before that you cannot copy applications like Office between systems.  They must be installed.  Office and most other applications can g\be installed by Group Policy.  This -is how we normally do this in Windows.  There is normally
no other way to do this for a large number of systems.
For large numbers of arbitrary file we would normally use RoboCopy.  The issues you have had with RoboCopy can be overcome by setting the correct options.  If you are trying to copy Office or other applications you sill likely find that many files
are locked.  This cannot be overcome by any copy method.  This is one of many reasons why we use Installers for applications.
I suggest that you learn the basics of Windows and how it manages applications and files.  Getting the fundamentals clear will help you to understand how to perform basic tasks in a Windows network.
If you really need help with this then you need to step back and explain exactly what is being copied and why.  I can think of no real world scenario where what you are asking for is necessary.  If you can  explain that perhaps we can point
you at a usable solution.
Just keep in mind that you cannot remotely install Office or most applications by copying the files.  This has always been true in  Windows.
¯\_(ツ)_/¯