subir archivos mediante ftp con java sockets

aqui les dejo el codigo facil y sencillo

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.MalformedURLException;
import java.net.Socket;
import java.util.StringTokenizer;
/**
 *@author Leyer 
 */
public class ftp {
 /**
  * Sube un archivo a un servidor FTP
  * 
  * @param ftpServer Servidor FTP
  * @param user      Usuario
  * @param password  Contraseña
  * @param location  Directorio donde se subira el archivo
  * @param file      Archivo que se va a subir
  * @param debug     Para Mostrar las respuestas del servidor
  * 
  */
 public static void uploadFileToFTP(String ftpServer,String user,String password,String location,File file, boolean debug     ){
  try {
  if(file.exists()){
   Socket socket=new Socket(ftpServer,21);
   BufferedWriter bufferedWriter=new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
   BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(socket.getInputStream()));
   bufferedWriter.write("USER "+user+"\r\n");
   bufferedWriter.flush();
   bufferedWriter.write("PASS "+password+"\r\n");
   bufferedWriter.flush();
   bufferedWriter.write("CWD "+location+"\r\n");
   bufferedWriter.flush();
   bufferedWriter.write("TYPE A\r\n");
   bufferedWriter.flush();
   bufferedWriter.write("PASV\r\n");
   bufferedWriter.flush();
   String response=null;
   while((response=bufferedReader.readLine())!=null){
    if(debug)
     System.out.println(response);
    if(response.startsWith("530")){
     System.err.println("Login aunthentication failed");
     break;
    }
    if(response.startsWith("227")){
         String address = null;  
                  int port = -1;  
                  int opening = response.indexOf('(');  
                  int closing = response.indexOf(')', opening + 1);  
                  if (closing > 0) {  
                      String dataLink = response.substring(opening + 1, closing);  
                      StringTokenizer tokenizer = new StringTokenizer(dataLink, ",");  
                      try {  
                          address = tokenizer.nextToken() + "." + tokenizer.nextToken() + "." + tokenizer.nextToken() + "." + tokenizer.nextToken();  
                          port = Integer.parseInt(tokenizer.nextToken()) * 256 + Integer.parseInt(tokenizer.nextToken());  
                      }  
                      catch (Exception e) {  
                          e.printStackTrace();
                      }
                      try{
                Socket transfer =new Socket(address,port);
             bufferedWriter.write("STOR "+file.getName()+"\r\n");
             bufferedWriter.flush();
                   response=bufferedReader.readLine();
                   if(debug)
                    System.out.println(response);
             if(response.startsWith("150")){
              FileInputStream fileInputStream=new FileInputStream(file);
              final int BUFFER_SIZE=1024;
              byte buffer[]=new byte[BUFFER_SIZE];
              int len=0,off=0;
              if(debug)
               System.out.println("uploading file...");
              while((len=fileInputStream.read(buffer))!=-1)
               transfer.getOutputStream().write(buffer, off, len);
              transfer.getOutputStream().flush();
              transfer.close();
              bufferedWriter.write("QUIT\r\n");
              bufferedWriter.flush();
              bufferedReader.close();
              socket.close();
              System.out.println("File sucessfully transferred!");
              break;
              }
                      }catch (Exception e) {
        System.err.println(e);
       }
                  }  
     }
    }
   }else{
    System.err.println(file+"no exist!");
   }
  } catch (MalformedURLException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }
 public static void main(String[] args) {
  uploadFileToFTP("***.net","*******","*******","/test", new File("c:\\readme.txt"),true);
 }
}