magento表单的导出

1.Grid.php中得有:
   $this->addExportType('*/*/exportXml' , Mage::helper('hpusernetwork' )->__('Excel XML'));
   $this->addExportType('*/*/exportCsv' , Mage::helper('hpusernetwork' )->__('CSV'));
    相应的controller中的方法是:
   public function exportXmlAction(){
             $fileName   = 'warehouse_batch_' . date('YmdHis') . '.xml';
             $content    = $this->getLayout()->createBlock('bf170card/adminhtml_account_index_grid')->getExcelFile();
             $this->_prepareDownloadResponse($fileName , $content );
      }
      
       public function exportCsvAction(){
             $fileName = 'warehouse_batch_' . date('YmdHis') . '.csv';
             $content = $this->getLayout()->createBlock('bf170card/adminhtml_account_index_grid' )->getCsvFile();
             $this->_prepareDownloadResponse($fileName , $content );
      }