//自定义
'uploads' => [
  'driver' => 'local',
  //'root' => storage_path('app/uploads'),
  'root' => public_path('uploads/'.date('Ymd')),
],

<div class="panel panel-default">
    <div class="panel-heading">文件上传</div>
    <div class="panel-body">
      <form class="form-horizontal" role="form" method="POST" action="" enctype="multipart/form-data">
        {{ csrf_field() }}
        <div class="form-group">
          <label for="file" class="col-md-4 control-label">Hello world</label>
          <div class="col-md-6">
            <input id="file" type="file" class="form-control" name="source">
          </div>
        </div>
        <div class="form-group">
          <div class="col-md-6 col-md-offset-4">
            <button type="submit" class="btn btn-primary">
              <i class="fa fa-btn fa-sign-in"></i> 上传
            </button>
          </div>
        </div>
      </form>
    </div>
</div>

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;
//上传文件 功能实现方法
public function upload(Request $request){
    if ($request->isMethod('POST')){
      $file = $request->file('source');
      //判断文件是否上传成功
      if ($file->isValid()){
        //原文件名
        $originalName = $file->getClientOriginalName();
        //扩展名
        $ext = $file->getClientOriginalExtension();
        //MimeType
        $type = $file->getClientMimeType();
        //临时绝对路径
        $realPath = $file->getRealPath();
        $filename = uniqid().'.'.$ext;
        $bool = Storage::disk('uploads')->put($filename,file_get_contents($realPath));
        //判断是否上传成功
        if($bool){
          echo 'success';
        }else{
          echo 'fail';
        }
      }
    }
    return view('upload');
}