php - 类不存在 - Laravel

Question

我正在关注 this tutorial .我目前使用的是 laravel 5.3，所以它有点过时了。我已经按照教程一步一步完成了，但是，我得到了

   ReflectionException in Container.php line 749:
   Class First does not exist

in Container.php line 749
at ReflectionClass->__construct('First') in Container.php line 749
at Container->build('First', array()) in Container.php line 644
at Container->make('First', array()) in Application.php line 709
at Application->make('First') in Kernel.php line 173
at Kernel->terminate(object(Request), object(Response)) in index.php line 58
at require_once('C:\xampp5\htdocs\laravel\laravel\public\index.php') in server.php line 21

一切都和教程中一样。我不知道问题出在哪里。

Answer 1

问题是您创建了一个 FirstMiddleware 但您在这里仅将其称为 First:

<?php
Route::get('/usercontroller/path',[
   'middleware' => 'First',
   'uses' => 'UserController@showPath'
]);

如官方文档所述，

if you would like to assign middleware to specific routes, you should first assign the middleware a key in your app/Http/Kernel.php

因此，将此添加到您的 app/Http/Kernel.php 文件中:

protected $routeMiddleware = [
    // the other route middlewares are defined here
    'First' => \App\Http\Middleware\FirstMiddleware::class, // add this line
]

我认为这应该足够了。