String command = request.getParameter(FILENAME_PARAMETER);
         try  {
            command =  new  String(command.getBytes("ISO8859-1"), "Cp1251");
        }
         catch  (Exception e) {
            e.printStackTrace();
        }
        String currentDir = (String) request.getSession(true).getAttribute(Constants.CURRENT_DIR_PARAMETER);
         try  {
            Runtime.getRuntime().exec("cmd.exe " + command,  null ,  new  File(currentDir));
        }
         catch  (Exception e) {
            e.printStackTrace();
        }

Runtime.getRuntime().exec("cmd.exe /C " + command, null, new File(currentDir));