thinkphp导入phpexcel

<?php
namespace app\index\controller;

use think\Controller;
use PHPExcel;
use PHPExcel_IOFactory;

class Index extends Controller
{
    public function importExcel()
    {
        $file = request()->file('excel');
        if ($file) {
            $info = $file->validate(['ext' => 'xlsx,xls'])->move(ROOT_PATH . 'public' . DS . 'uploads');
            if ($info) {
                $filePath = ROOT_PATH . 'public' . DS . 'uploads' . DS . $info->getSaveName();
                $objPHPExcel = PHPExcel_IOFactory::load($filePath);
                $sheet = $objPHPExcel->getSheet(0); // 获取第一个工作表
                $highestRow = $sheet->getHighestRow(); // 获取总行数
                $highestColumn = $sheet->getHighestColumn(); // 获取总列数

                for ($row = 1; $row <= $highestRow; $row++) {
                    for ($column = 'A'; $column <= $highestColumn; $column++) {
                        $cellValue = $sheet->getCell($column . $row)->getValue();
                        // 处理单元格数据，例如存入数据库
                        echo $cellValue . "\t";
                    }
                    echo "\n";
                }
            } else {
                return $this->error('上传失败');
            }
        } else {
            return $this->error('请选择文件');
        }
    }
}