'uplaods' => [
  'driver' => 'local',
  'root' => storage_path('app/uploads'),
],

input type="file" name="headimg" />

$file = $request->file('headimg');
if($file  $file->isValid()){
//   //获取原图片信息
    $ext = $file->getClientOriginalExtension();
    $originalName = $file->getClientOriginalName();
    $type = $file->getClientMimeType();
    $path = $file->getRealPath();
    //验证图片类型，大小等
    //保存图片
    $save_name = date('YmdHis',time()) .'-' .uniqid() .'.'. $ext;
    $bool = Storage::disk('uploads')->put($save_name,file_get_contents($path));
    if(!$bool){
      return redirect()->back()->withErrors('图片上传失败')->withInput();
    }
}else{
    return redirect()->back()->withErrors('请上传图片')->withInput();
}
//如果验证通过，则继续执行下面的代码
$data = $request->input('Student');
//图片全路径
$img_web_path = storage_path('app/uploads') . '/' .$save_name;
//图片相对路径
$data['headimg'] = $save_name;
if(Student::create($data)){
    return redirect('Student/index')->with('success','添加成功');
}else{
    return redirect()->back();
}