导出数据到Excel文件

使用Thinkphp3.2版本的框架。
public function huanxinmsg(){
    $identity = I("get.ident");
    $roomid = I("get.roomid");
    $chatmsg = D('user_zhibo_chatmessage');
    $map['identity'] = $identity;
    $map['roomid'] = $roomid;
    $res =$chatmsg->field('id,content')->where($map)->order("id asc")->select();
    import("Org.Util.PHPExcel");
    $EXCEL = new PHPExcel();
    $EXCEL->getProperties()->setCreator("NECionpy")
        ->setLastModifiedBy("NECionpy")
        ->setTitle("聊天历史纪录")
        ->setSubject("聊天历史纪录")
        ->setDescription("记录导出")
        ->setKeywords("excel")
        ->setCategory("result file");
    $Sheet = $EXCEL->setActiveSheetIndex(0);
    $Sheet->getColumnDimension('A')->setAutoSize(true);
    // 设置水平居中
    $Sheet->getStyle('A')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
    // 设置垂直居中
    $Sheet->getStyle('A')->getAlignment()->setVertical(PHPExcel_Style_Alignment::VERTICAL_CENTER);
    $EXCEL->setActiveSheetIndex(0)->setCellValue('A1', 'msg');
    $num = 2;
    if(!empty($res) && count($res) != 0){
        foreach ($res as $k => $v) {
            $content = json_decode($v['content'],true);
            $msg = json_decode($content,true);
            $EXCEL->setActiveSheetIndex(0)->setCellValue('A' . $num, $msg['payload']['bodies'][0]['msg']);
            $num++;
        }
        header("Pragma: public");
        header("Expires: 0");
        header("Cache-Control:must-revalidate, post-check=0, pre-check=0");
        header("Content-Type:application/force-download");
        header("Content-Type:application/vnd.ms-execl");
        header("Content-Type:application/octet-stream");
        header("Content-Type:application/download");;
        header('Content-Disposition:attachment;filename="聊天历史纪录_' . date('Ymd',time()) . '.xls"');
        header("Content-Transfer-Encoding:binary");
        import("Org.Util.PHPExcel.Writer.Excel5");
        $Writer = new PHPExcel_Writer_Excel5($EXCEL);
        $Writer->save('php://output');
    }else{
        echo '暂时没有查询到数据';exit;
    }
}