对于特定的网址,希望,执行一个或多个特定的步骤,这几个步骤称为中间件。
例如:对于一个电商网站。
用户浏览商品时不需要登录,给购物车付钱时,需要登录,点击个人资料时,也需要。
于是,在付钱,个人资料这些特定网址,加入登录中间件。
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进入项目目录,
php artisan make:middleware TestMiddleware
php artisan make:middleware TestMiddl2eware
在app / http / middleware目录下找到两个新文件
test的文件的函数
public function handle($request, Closure $next) { if($request->input('age')<18) return redirect()->route('refuse'); return $next($request); }
test2的文件的函数
public function handle($request, Closure $next) { if($request->input('age2')<17) return redirect()->route('refuse'); return $next($request); }
修改app / http /kernal。php文件,这是注册
protected $routeMiddleware = [ 'auth' => \Illuminate\Auth\Middleware\Authenticate::class, 'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class, 'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class, 'can' => \Illuminate\Auth\Middleware\Authorize::class, 'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class, 'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class, 'test' => \App\Http\Middleware\TestMiddleware::class, 'test2' => \App\Http\Middleware\Test2Middleware::class, ];
修改 app / routes /web.php
Route::group ( [ 'middleware' => ['test','test2'] ], function () { Route::get ( '/write/laravelacademy', function () { // 使用Test中间件 echo "/write/laravelacademy"; } ); Route::get ( '/update/laravelacademy', function () { // 使用Test中间件 echo "/update/laravelacademy"; } ); } ); Route::get ( '/age/refuse', [ 'as' => 'refuse', function () { return "未成年人禁止入内!"; } ] );
输入
http://localhost/write/laravelacademy?age=199&age2=19
挺正常的。
输入
http://localhost/write/laravelacademy?age=199&age2=16
会触发test2中间件,结果是跳转,如把age改小,触发test1中间件。也跳转。
中间件本身还可以带参数,且由外界注入,不在自身写死。
'middleware' => ['test:18','test2:17']
public function handle($request, Closure $next,$val) { if($request->input('age')< $val) return redirect()->route('refuse'); return $next($request); }