test_app/app/Models/UploadFiles.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class UploadFiles extends Model
{
    function upload($file,$path,$type=1,$size=2000)
    {
        if ($file->isValid()) {
            $filename = $file->getClientOriginalName();//获取上传文件的文件名（带后缀，如abc.png）
            $fileextension = $file->getClientOriginalExtension();//获取上传文件的后缀（如abc.png，获取到的为png）
            if($type==1){    // 图片
                $preg_str='/(jpg|jpeg|png|gif)/';
            }elseif($type==2){ // excel表格
                $preg_str='/(xlsx|xls|csv)/';
            }
            if (!preg_match($preg_str, strtolower($filename))) {
                return response()->json([
                    'msg' => '文件格式有误'
                ]);
            }
            $filesize = $file->getSize();//获取上传文件的大小
            if (($filesize / 1024) > $size) {
                return response()->json([
                    'msg' => '请检查您上传的文件不能大于'.$size.'KB'
                ]);
            }
            $newfilename = date("YmdHis") . mt_rand(1000, 9999) . substr(md5(uniqid(rand(1000, 9999))), 6, 18) . '.' . $fileextension;
            $newpath = $request->server('DOCUMENT_ROOT') . $path; //  '/images/commit'
            $result = $file->move($newpath, $newfilename);
            if($result){
                return response()->json([
                    'filename'=>$newfilename,
                    'msg' => '文件上传成功'
                ]);
            }
        } else {
            return response()->json([
                'msg' => '文件上传失败'
            ]);
        }
    }
}