Listener – 蓝天白云

一、简单介绍事件和监听器

　　事件Event：主要用做数据的载体，里面只是包含要传递的数据。

　　监听器Listener：事件真正被触发的地方，其handle方法接受传入的Event对象，并在此处理Event中带来的数据。

二、首先定义事件和事件监听器

　　打开App\Providers\EventServiceProvider.php，给$listen数组赋值要添加的事件和监听器，可定义多个事件，每个事件也可以定义多个监听器。

　　比如：

<?php

namespace App\Providers;

use Illuminate\Contracts\Events\Dispatcher as DispatcherContract;
use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;

class EventServiceProvider extends ServiceProvider
{
    /**
     * The event listener mappings for the application.
     *
     * @var array
     */
    protected $listen = [
        'App\Events\UserReigisterEvent' => [
          'App\Listeners\UserRegisterListener',  
        ],
        'App\Events\UserLoginEvent' => [
            'App\Listeners\UserLoginListener',
        ],
    ];

    /**
     * Register any other events for your application.
     *
     * @param  \Illuminate\Contracts\Events\Dispatcher  $events
     * @return void
     */
    public function boot(DispatcherContract $events)
    {
        parent::boot($events);

        //
    }
}

<?php

namespace App\Providers;

use Illuminate\Contracts\Events\Dispatcher as DispatcherContract;

use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;

class EventServiceProvider extends ServiceProvider

{

/**

* The event listener mappings for the application.

* @var array

protected $listen = [

'App\Events\UserReigisterEvent' => [

'App\Listeners\UserRegisterListener',

'App\Events\UserLoginEvent' => [

'App\Listeners\UserLoginListener',

];

/**

* Register any other events for your application.

* @param \Illuminate\Contracts\Events\Dispatcher $events

* @return void

public function boot(DispatcherContract $events)

{

parent::boot($events);

}

三、在控制台生成相关文件

　　在控制台输入命令：

　　php artisan event:generate

　　执行完以后可以看到App\Event和App\Listeners两个目录下多了相应的php类

四、定义Event类

　　Event类主要用于运输数据，在_construct函数的参数中传入，并将值保存在内部成员变量中，示例如下：

<?php

namespace App\Events;

use App\Events\Event;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;

use App\User;

class UserLoginEvent extends Event
{
    use SerializesModels;
    
    public $user;
    public $logintimes;

    /**
     * Create a new event instance.
     *
     * @return void
     */
    public function __construct(User $_user, $_logintimes)
    {
        $this->user = $_user;
        $this->logintimes = $_logintimes;
    }

    /**
     * Get the channels the event should be broadcast on.
     *
     * @return array
     */
    public function broadcastOn()
    {
        return [];
    }
}

<?php

namespace App\Events;

use App\Events\Event;

use Illuminate\Queue\SerializesModels;

use Illuminate\Contracts\Broadcasting\ShouldBroadcast;

use App\User;

class UserLoginEvent extends Event

{

use SerializesModels;

public $user;

public $logintimes;

/**

* Create a new event instance.

* @return void

public function __construct(User $_user, $_logintimes)

{

$this->user = $_user;

$this->logintimes = $_logintimes;

}

/**

* Get the channels the event should be broadcast on.

* @return array

public function broadcastOn()

{

return [];

}

五、Listener中处理事件

<?php

namespace App\Listeners;

use App\Events\UserLoginEvent;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Contracts\Queue\ShouldQueue;

class UserLoginListener
{
    /**
     * Create the event listener.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    /**
     * Handle the event.
     *
     * @param  UserLoginEvent  $event
     * @return void
     */
    public function handle(UserLoginEvent $event)
    {
        echo $event->logintimes;
        echo $event->user->username;
    }
}

<?php

namespace App\Listeners;

use App\Events\UserLoginEvent;

use Illuminate\Queue\InteractsWithQueue;

use Illuminate\Contracts\Queue\ShouldQueue;

class UserLoginListener

{

/**

* Create the event listener.

* @return void

public function __construct()

{

}

/**

* Handle the event.

* @param UserLoginEvent $event

* @return void

public function handle(UserLoginEvent $event)

{

echo $event->logintimes;

echo $event->user->username;

}

六、触发事件

　　比如在用户登录成功的地方调用前面定义的事件

    $loginevent = new UserLoginEvent($loginuser, $logintimes);
    event($loginevent);

1 2	$loginevent = new UserLoginEvent($loginuser, $logintimes); event($loginevent);