作业：创建一个路由中间件，并通过访问url地址来触发中间件输出一名话：‘hello middware’
先新建一个中间件，这里采用命令行创建，执行如下代码：
php artisan make:middleware Check
运行后如下图所示：
Check.php代码如下所示：
<?php
namespace App\Http\Middleware;
use Closure;
class Check
{
//注意这里必需是handle
public function handle($req,Closure $next){
$username='admin';
if($username != 'admin'){
exit('没有权限操作');
}
echo 'Hello Middleware!';
return $next($req);
}
}紧接着注册中间件（必需的步骤），在kernel.php这个文件添加代码：
找到这一块的代码，新增最后一行，注册中间件：
protected $routeMiddleware = [ 'auth' => \App\Http\Middleware\Authenticate::class, 'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class, 'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class, 'cache.headers' => \Illuminate\Http\Middleware\SetCacheHeaders::class, 'can' => \Illuminate\Auth\Middleware\Authorize::class, 'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class, 'signed' => \Illuminate\Routing\Middleware\ValidateSignature::class, 'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class, 'verified' => \Illuminate\Auth\Middleware\EnsureEmailIsVerified::class, //在这里添加后面的代码 'check' => \App\Http\Middleware\Check::class ];
新建控制器文件Home.php：
<?php
namespace App\Http\Controllers;
use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
class Home extends Controller
{
public function index(Request $req){
}
}最后添加路由的代码，在web.php文件里面：
Route::get('/Home','Home@index')->middleware('check');
//这里的check就是在注册路由的时候的Key值运行后效果如下图所示：
注意使用中间件的时候一定要注册，还有中间件方法名称必需为handle
