public boolean checkuserexist(String userid)
    {
    	boolean returned = false;
		try  {
			ftp.connect(ftp_host);
			ftp.enterLocalPassiveMode();
			ftp.login(ftp_username,ftp_password);

			String[] files = ftp.listNames();

			for(int i=0;i<files.length;i++)
			{
				String getFile = files[i].toString();
	    		if(getFile==userid)
	    		{
	    			returned=true;
	    		}
			}
			ftp.disconnect();
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
		return returned;
    }