Laravel 5.2中的BindingResolutionException-Java 学习之路

我是laravel的新手，我开始使用Laravel 5.2

我正在创建一个管理面板，所以我创建了一个调用Admin的中间件 . 但是有一个绑定错误，我不知道如何解决这个问题 .

我的routes.php代码是这样的：

Route::get('/', 'HomeController@index');
Route::get('home', 'HomeController@index');
Route::controllers([
    'auth' => 'Auth\AuthController',
    'password' => 'Auth\PasswordController'
]);
Route::group(['prefix' => 'admin', 'middleware' => 'auth', 'namespace' => 'Admin'], function(){
    Route::pattern('id', '[0-9]+');
    Route::get('dashboard', 'DashboardController@index');
});

这是我的Admin.php：

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Contracts\Auth\Guard;
use Illuminate\Routing\ResponseFactory;
use App\Models\AssignedRole;

class Admin
{
    protected $auth;
    protected $response;
    protected function __construct(Guard $auth,ResponseFactory $response)
    {
        $this->auth = $auth;
        $this->response = $response;
    }
    public function handle($request, Closure $next)
    {
        if($this->auth->check())
        {
            $admin = 0;
            if($this->auth->user()->admin === '1')
            {
                $admin = 1;
            }
            if($admin === 0)
            {
                return $this->response->redirectTo('/');
            }
            return $next($request);
        }
        return $this->response->redirectTo('/');
    }
}

这是我在Kernel.php文件中的routeMiddleware：

protected $routeMiddleware = array(
    'auth' => \App\Http\Middleware\Authenticate::class,
    'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
    'can' => \Illuminate\Foundation\Http\Middleware\Authorize::class,
    'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
    'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
    'admin' => \App\Http\Middleware\Admin::class
);

异常消息是：'Illuminate \ Contracts \ Container \ BindingResolutionException'，消息'Target [App \ Http \ Middleware \ Admin]不可实例化 . 在C：\ wamp64 \ www \ neredenal \ vendor \ laravel \ framework \ src \ Illuminate \ Container \ Container.php：752

有没有想过修复这个例外？

Laravel 5.2中的BindingResolutionException

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