Java APIs

Hi.

i have written code for file upload manager using ftp..

it perfectly working with sequence file uploading in single connection..

And i tried to upload multiple files with parallel processing in a single connection.... but it is not working properly.. i also used thread concept
but single file only transfered and connection refused...

my code here...

//////////////////// main class //////////////////////////////////////////
ftp.connect();

ftp.login();

String [] archivos = new  String[100];
					    	File dir = new File("C:\\Files Uploading\\");
							archivos = dir.list();
							for (int s=0; s<archivos.length;s++)
							{
	//Start Data Transfer Here
	new DataTransfer(archivos[s]).start();
							Thread.sleep(1000);
							}
 
/////////////////////// thread class ////////////////////////////////
class DataTransfer extends Thread
{
      String FileName="";
      String LocalPath="",RemotePath="";
       public DataTransfer(String fname)
        {
	FileName = fname;
	LocalPath = "C:\\Files Uploading\\" + FileName;
	RemotePath = FileName;
	System.out.println(LocalPath);		
        }
        public void run()
        {
                    System.out.println("DataTransfer Started");
	/File Transfer Here
	try 
                     {
	      FileInputStream input = new FileInputStream(LocalPath);
			
                           Ftp_Client.storeFile(RemotePath,input);

	System.out.println("Successfully sent : " + RemotePath);
            
	}
	catch (Exception exc) 
	{
		System.out.println(exc.getMessage());
	}
		System.out.println("DataTransfer Ended");
	}
	}

otherwise tell me any other alternate way