// If targetLocation does not exist, it will be created.
 public void copyDirectory(File sourceLocation , File targetLocation)
 throws IOException {
 
     if (sourceLocation.isDirectory()) {
         if (!targetLocation.exists()) {
             targetLocation.mkdir();
         }
 
         String[] children = sourceLocation.list();
         for (int i=0; i<children.length; i++) {
             copyDirectory(new File(sourceLocation, children[i]),
                     new File(targetLocation, children[i]));
         }
     } else {
 
         InputStream in = new FileInputStream(sourceLocation);
         OutputStream out = new FileOutputStream(targetLocation);
 
         // Copy the bits from instream to outstream
         byte[] buf = new byte[1024];
         int len;
         while ((len = in.read(buf)) > 0) {
             out.write(buf, 0, len);
         }
         in.close();
         out.close();
     }
 }