/**
* 将数据导出到Excel
*/
public function actionExport()
{
    //取要导出到Excel的数据
    $criteria = $this->_getCriteria();
    $data = Statistics::model()->findAll($criteria);
    // 获取PHPExcel引用路径
    $phpExcelPath = Yii::getPathOfAlias('system.vendors');
    // 关闭YII的自动加载功能，改用手动加载，否则会出错，PHPExcel有自己的自动加载功能
    // YII框架对于组件的自动加载，要求类名与文件名一致；
    // 而PHPExcel类对应的文件名包含了上级目录名称，如：IOFactory类对应的文件名为PHPExcel_IOFactory.php
    spl_autoload_unregister(array('YiiBase','autoload'));
    include($phpExcelPath . DIRECTORY_SEPARATOR . 'PHPExcel.php');
    //下面是Excel数据导出处理逻辑
    $objPHPExcel = PHPExcel_IOFactory::load('./content/template/report.xlsx');
    $objPHPExcel->getProperties()->setCreator("Kalman")
    ->setTitle("统计报表")
    ->setSubject("统计报表")
    ->setDescription("统计报表");
    $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打开后显示的工作表
    $objPHPExcel->setActiveSheetIndex(0);
    //通浏览器输出Excel报表
    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();
    //恢复Yii自动加载功能
    spl_autoload_register(array('YiiBase','autoload'));
}