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场景：保存订单的时候，用事件监听这个动作，一旦保存订单成功，就执行相应的其他操作生成日志
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1、编写事件和监听的关系，代码如下
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namespace App\Providers;
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use Illuminate\Support\Facades\Event;
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use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;
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class EventServiceProvider extends ServiceProvider
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{
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    /**
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     * The event listener mappings for the application.
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     *
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     * @var array
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     */
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    protected $listen = [
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        'App\Events\Event' => [
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            'App\Listeners\EventListener',
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        ],
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        'App\Events\PostSaved'=>[
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        'App\Listeners\SaveDataToCache'
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        ]
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    ];
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    /**
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     * Register any events for your application.
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     *
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     * @return void
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     */
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    public function boot()
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    {
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        parent::boot();
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        //
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    }
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}
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2、运行命令生成刚刚注册的事件和监听者的文件
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[root@iZm5eg0edzgzzaypwu5yjyZ blog]# /usr/local/php/bin/php artisan event:generate
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Events and listeners generated successfully!
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[root@iZm5eg0edzgzzaypwu5yjyZ blog]# 
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ps:该命令会在app/Events目录下生成PostSaved.php，在app/Listeners目录下生成SaveDataToCache.php
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3、编写事件内容
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namespace App\Events;
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use Illuminate\Broadcasting\Channel;
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use Illuminate\Queue\SerializesModels;
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use Illuminate\Broadcasting\PrivateChannel;
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use Illuminate\Broadcasting\PresenceChannel;
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use Illuminate\Foundation\Events\Dispatchable;
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use Illuminate\Broadcasting\InteractsWithSockets;
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use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
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use App\Models\Order;
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class PostSaved
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{
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    use Dispatchable, InteractsWithSockets, SerializesModels;
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//public $order;
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    /**
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     * Create a new event instance.
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     *
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     * @return void
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     */
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    public function __construct(Order $order)
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    {
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        //
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        $this->order = $order;
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    }
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    /**
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     * Get the channels the event should broadcast on.
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     *
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     * @return \Illuminate\Broadcasting\Channel|array
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     */
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    public function broadcastOn()
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    {
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        return new PrivateChannel('channel-name');
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    }
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}
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3、编写监听的内容
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namespace App\Listeners;
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use App\Events\PostSaved;