ThinkPhP 导出 excel

//导出excel
/**方法**/
public function exportExcel($expTitle,$expCellName,$expTableData){
$xlsTitle = iconv('utf-8', 'gb2312', $expTitle);//文件名称
$fileName = $_SESSION['account'].date('_YmdHis');//or $xlsTitle 文件名称可根据自己情况设定
$fileName = iconv("utf-8", "gb2312", $fileName);
$cellNum = count($expCellName);
$dataNum = count($expTableData);
vendor("PHPExcel");
$objPHPExcel = new PHPExcel();
$cellName = array('A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','AA','AB','AC','AD','AE','AF','AG','AH','AI','AJ','AK','AL','AM','AN','AO','AP','AQ','AR','AS','AT','AU','AV','AW','AX','AY','AZ');
$objPHPExcel->getActiveSheet(0)->mergeCells('A1:'.$cellName[$cellNum-1].'1');//合并单元格
// $objPHPExcel->setActiveSheetIndex(0)->setCellValue('A1', $expTitle.'  Export time:'.date('Y-m-d H:i:s'));
for($i=0;$i<$cellNum;$i++){
$objPHPExcel->setActiveSheetIndex(0)->setCellValue($cellName[$i].'2', $expCellName[$i][1]);
}
// Miscellaneous glyphs, UTF-8
for($i=0;$i<$dataNum;$i++){
for($j=0;$j<$cellNum;$j++){
$objPHPExcel->getActiveSheet(0)->setCellValue($cellName[$j].($i+3), $expTableData[$i][$expCellName[$j][0]]);
}
}
header('pragma:public');
//Header('content-Type:application/vnd.ms-excel;charset=utf-8');
header('Content-type:application/vnd.ms-excel;charset=utf-8;name="'.$xlsTitle.'.xls"');
header("Content-Disposition:attachment;filename=$fileName.xls");//attachment新窗口打印inline本窗口打印
ob_clean();
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
$objWriter->save('php://output');
exit;
}
/**
*
* 导出Excel
*/
function expUser(){//导出Excel
$xlsName  = "User";
$xlsCell  = array(
array('id','ID'),
array('name','名字'),
array('username','工号'),
array('logintime','最后登录时间'),
array('phone','手机')
);
$xlsModel = M('User');
$xlsData  = $xlsModel->Field('id,name,username,logintime,phone')->select();
$this->exportExcel($xlsName,$xlsCell,$xlsData);
}

<a href="{:U('User/expUser')}" >
<input type="button" value="导出" class="btn btn-info active" style="padding-top: 2px;padding-bottom: 2px;margin-left:10px;"/>
</a>