laravel事件event简单实例

小灰灰 2022-01-25 16:49 219阅读 0赞

在`app/providers/EventServiceProvider` 中的`$listen`加入

'App\Events\BlogView' => [
                'App\Listeners\BlogViewListener',
            ],

生成事件类、监听类

php artisan event:generate

事件类`BlogView`中写入要触发的事件

<?php
    
    namespace App\Events;
    
    use App\Models\Article;
    use Illuminate\Broadcasting\Channel;
    use Illuminate\Queue\SerializesModels;
    use Illuminate\Broadcasting\PrivateChannel;
    use Illuminate\Broadcasting\PresenceChannel;
    use Illuminate\Foundation\Events\Dispatchable;
    use Illuminate\Broadcasting\InteractsWithSockets;
    use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
    use Illuminate\Support\Facades\Event;
    
    class BlogView
    {
        use Dispatchable, InteractsWithSockets, SerializesModels;
    
        /**
         * Create a new event instance.
         *
         * @return void
         */
    public $article;
        public function __construct(Article $article)//写入监听项，可以多项
        {
            //
            $this->article = $article;
        }
    
        /**
         * Get the channels the event should broadcast on.
         *
         * @return \Illuminate\Broadcasting\Channel|array
         */
        public function broadcastOn()
        {
            return new PrivateChannel('channel-name');
    
        }
    }

事件监听类`BlogViewListener`中写入事件触发后的逻辑

<?php
    
    namespace App\Listeners;
    
    use App\Events\BlogView;
    use App\Models\Article;
    use Illuminate\Queue\InteractsWithQueue;
    use Illuminate\Contracts\Queue\ShouldQueue;
    
    class BlogViewListener
    {
        /**
         * Create the event listener.
         *
         * @return void
         */
        public function __construct()
        {
            //
        }
    
        /**
         * Handle the event.
         *
         * @param  BlogView  $event
         * @return void
         */
        public function handle(BlogView $event)
        {
            $id = $event->article->id;//接受监听项$article
    
    //dd($id);逻辑代码，如触发后给用户发注册码，邮件等
            $view = Article::where('id',$id)->increment('view');
    
        }
    }

控制器中绑定事件

$article = Article::find($id);
            Event::fire(new BlogView($article));

> 注：绑定事件名在三个类中要一致