php artisan make:middleware <middleware-name> 

使用你的中间件名称替换<middleware-name>。创建可以看到中间件在 app/http/middleware 目录。

示例

php artisan make:middleware agemiddleware

第3步 − agemiddlware 会在 app/http/middleware 文件中创建。新创建的文件将自动创建下面代码：

<?php
namespace app\http\middleware;
use closure;

class agemiddleware {
   public function handle($request, closure $next) {
      return $next($request);
   }
}

注册中间件

• 全局中间件
• 路由中间件

全局中间件将在应用程序的每个http请求运行，而路由中间件将被分配到一个特定的路由。中间件可在 app/http/kernel.php 注册. 
该文件包含两个属性： $middleware 和 $routemiddleware。$middleware 属性用于注册全局中间件，$routemiddleware属性用于注册路由指定中间件。

protected $middleware = [
   \illuminate\foundation\http\middleware\checkformaintenancemode::class,
   \app\http\middleware\encryptcookies::class,
   \illuminate\cookie\middleware\addqueuedcookiestoresponse::class,
   \illuminate\session\middleware\startsession::class,
   \illuminate\view\middleware\shareerrorsfromsession::class,
   \app\http\middleware\verifycsrftoken::class,
];

protected $routemiddleware = [
   'auth' => \app\http\middleware\authenticate::class,
   'auth.basic' => \illuminate\auth\middleware\authenticatewithbasicauth::class,
   'guest' => \app\http\middleware\redirectifauthenticated::class,
];

示例

我们已经在前面的例子中已创建 agemiddleware 中间件。 现在，我们可以在具体的路由中间件属性登记。注册代码如下所示。

<?php
namespace app\http;
use illuminate\foundation\http\kernel as httpkernel;

class kernel extends httpkernel {
   protected $middleware = [
      \illuminate\foundation\http\middleware\checkformaintenancemode::class,
      \app\http\middleware\encryptcookies::class,
      \illuminate\cookie\middleware\addqueuedcookiestoresponse::class,
      \illuminate\session\middleware\startsession::class,
      \illuminate\view\middleware\shareerrorsfromsession::class,
      \app\http\middleware\verifycsrftoken::class,
   ];
  
   protected $routemiddleware = [
      'auth' => \app\http\middleware\authenticate::class,
      'auth.basic' => \illuminate\auth\middleware\authenticatewithbasicauth::class,
      'guest' => \app\http\middleware\redirectifauthenticated::class,
      'age' => \app\http\middlware\agemiddleware::class,
   ];
}

中间件参数

我们也可以传递中间件参数。例如，如果您的应用程序有不同角色，如用户，管理员，超级管理员等，并且要验证基于角色的动作，这可以通过参数传递中间件来实现。我们创建的中间件包含以下功能，我们可以通过 $next 参数之后，自定义参数。

public function handle($request, closure $next) {
   return $next($request);
}

示例

php artisan make:middleware rolemiddleware

第3步  − 添加以下代码到新创建的角色中间件的处理方法 - app/http/middleware/rolemiddleware.php.

<?php
namespace app\http\middleware;
use closure;

class rolemiddleware {
   public function handle($request, closure $next, $role) {
      echo "role: ".$role;
      return $next($request);
   }
}

第4步  − 在 app\http\kernel.php 文件中注册角色中间件。 加入灰色突出的线条的是在该文件中注册 rolemiddleware 中间件。

php artisan make:controller testcontroller

app/http/testcontroller.php

<?php
namespace app\http\controllers;
use illuminate\http\request;
use app\http\requests;
use app\http\controllers\controller;

class testcontroller extends controller {
   public function index(){
      echo "<br>test controller.";
   }
}

app/http/routes.php

route::get('role',[
   'middleware' => 'role:editor',
   'uses' => 'testcontroller@index',
]);

http://localhost:8000/role

可终止的中间件

响应已经发送给浏览器后可终止中间件执行一些任务。这可以通过使用创建中间件“终止”方法的中间件来实现。可终止中间件会注册全局中间件。该终止方法将接受两个参数：$request 和 $response。终止方法可以被创建，如在下面显示的代码。

示例

php artisan make:middleware terminatemiddleware

第3步 - 复制下面的代码到新创建文件 - terminatemiddleware 在 app/http/middleware/terminatemiddleware.php 文件中如下：

<?php
namespace app\http\middleware;
use closure;

class terminatemiddleware {
   public function handle($request, closure $next) {
      echo "executing statements of handle method of terminatemiddleware.";
      return $next($request);
   }
   
   public function terminate($request, $response){
      echo "<br>executing statements of terminate method of terminatemiddleware.";
   }
}

第4步  − 注册 terminatemiddleware 到 app\http\kernel.php 文件中.

加了灰色突出的线条的是该文件中注册的 terminatemiddleware 中间件。

php artisan make:controller abccontroller

app/http/abccontroller.php

<?php
namespace app\http\controllers;
use illuminate\http\request;
use app\http\requests;
use app\http\controllers\controller;

class abccontroller extends controller {
   public function index(){
      echo "<br>abc controller.";
   }
}

app/http/routes.php

route::get('terminate',[
   'middleware' => 'terminate',
   'uses' => 'abccontroller@index',
]);

http://localhost:8000/terminate