Problem in doing FTP a directory by java code

Hello Frnds

I was trying to do ftp using sun.net.ftp.*; but while doing ftp its
not upload directories in proper structural way inspite of it it just
uploading the files which are in nested directory altogether
means i am not getting same directory structure as on client side....

Please Help me...
Here is the code attached

import java.io.*;
import sun.net.ftp.*;

class FTPServer{
 private String path="/C/remote";
//private String path="C:\\a_h\\cmaf2\\repository\\masterRepository\
\srcRepository" ;
 private String userName="superuser";
 private String passWd="nopasswd";
public static int BUFFER_SIZE = 10240;
FtpClient fc;

             public void connect()
           {
                   try{
                    fc=new FtpClient("192.168.61.84");
                    fc.login(userName,passWd);
    System.out.println("Connected");
                    fc.cd(path);
System.out.println("Path Changed");
                    fc.binary();
                     }
                  catch(Exception e)
                  {
                     e.printStackTrace();
                   }

           }

             public void disconnect()
            {
                if(null!=fc)
               {
                try{
                     fc.cd("/");
                     fc.closeServer();
System.out.println("DisConnected");
                    }
                 catch(Exception e){
                        e.printStackTrace();
                    }

               }
             }
public void putFile(String file_name)
       {
               try {
                  byte[] buffer = new byte[BUFFER_SIZE];
                   File file=new File(file_name);

                    FileInputStream in = new
FileInputStream(file_name);
                    String
file_separator=System.getProperty("file.separator");
                    int
last_index=file_name.lastIndexOf(file_separator);
                    OutputStream out =
fc.put(file_name.substring(last_index+1));

                    int counter = 0;
                    while (true) {
                        int bytes = in.read(buffer);
                        if (bytes < 0)
                        break;
                        out.write(buffer, 0, bytes);
                       counter += bytes;
                       System.out.println(counter);
                       }

                    out.flush();
                     out.close();
                     in.close();
                     }
                   catch(Exception e)
                  {
                    e.printStackTrace();

                  }

       }

public void visitAllDirsAndFiles(File dir) {

            if (dir.isDirectory()) {
             //putFile(dir.getAbsolutePath());
                File[] children = dir.listFiles();
                for (int i=0; i<children.length; i++) {
                    visitAllDirsAndFiles(children[i]);
                }
// exiting from the directory
               }else
            {
             String fileName=dir.getAbsolutePath();
             putFile(fileName);
               //System.out.println(fileName);

            }
        }
public static void main(String args[]){

FTPServer myserver=new FTPServer();
myserver.connect();
myserver.visitAllDirsAndFiles(new File("C:\\ULDC"));
myserver.disconnect();
}

}