/**
* 將數據導出到Excel
*/
public function actionExport()
{
    //取要導出到Excel的數據
    $criteria = $this->_getCriteria();
    $data = Statistics::model()->findAll($criteria);
    // 獲取PHPExcel引用路徑
    $phpExcelPath = Yii::getPathOfAlias('system.vendors');
    // 關閉YII的自動加載功能，改用手動加載，否則會出錯，PHPExcel有自己的自動加載功能
    // YII框架對于組件的自動加載，要求類名與文件名一致；
    // 而PHPExcel類對應的文件名包含了上級目錄名稱，如：IOFactory類對應的文件名為PHPExcel_IOFactory.php
    spl_autoload_unregister(array('YiiBase','autoload'));
    include($phpExcelPath . DIRECTORY_SEPARATOR . 'PHPExcel.php');
    //下面是Excel數據導出處理邏輯
    $objPHPExcel = PHPExcel_IOFactory::load('./content/template/report.xlsx');
    $objPHPExcel->getProperties()->setCreator("Kalman")
    ->setTitle("統計報表")
    ->setSubject("統計報表")
    ->setDescription("統計報表");
    $objPHPExcel->setActiveSheetIndex(0)
    ->setCellValue('A1', 'Hello')
    ->setCellValue('B2', 'world!')
    ->setCellValue('C1', 'Hello')
    ->setCellValue('D2', 'world!');
    $objPHPExcel->setActiveSheetIndex(0)
    ->setCellValue('A25', '123456');
    $objPHPExcel->getActiveSheet()->setTitle('report');
    // Excel打開后顯示的工作表
    $objPHPExcel->setActiveSheetIndex(0);
    //通瀏覽器輸出Excel報表
    header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
    header('Content-Disposition: attachment;filename="report.xlsx"');
    header('Cache-Control: max-age=0');
    $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
    $objWriter->save('php://output');
    Yii::app()->end();
    //恢復Yii自動加載功能
    spl_autoload_register(array('YiiBase','autoload'));
}