2.使用场景

例句一个物流发货的场景：我有个小程序商城，用户下单后需要在后台发货，发完货后我想在微信发送个模块通知提示用户，我想了想用户不登录微信或者把消息提示关闭了，那岂不是不能实时通知用户已经发货了，我决定再加个短信通知用户。有了模块通知，短信通知后我还嫌不够...然后我继续加.... 通常我们会这么写：

namespace App \ Http \ Controllers ; use Illuminate \ Http \ Request ; class OrderController extends Controller public function sendGoods ( ) //@todo:发货逻辑 //@todo:模块通知逻辑 //@todo:短信通知逻辑 //@todo:等等.... 复制代码

**这样写不是不可以，但是逻辑功能越来越多，控制器只会变得臃肿起来，后期不便于维护。这时候可能会有人说，那我可以封装起来啊，是的，你可以封装起来，然后就可以用简短的代码来实现。但是实际项目中，会涉及多人开发，这样就不方便了。所以推荐使用laravel自带的“事件监听“... **

3.使用”事件监听"优化代码

3.1 打开终端->切换到项目根目录->使用artisan命令创建事件监听文件

php artisan make:event OrderEvent
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执行完命令，发现 app/Events 目录下多了个 OrderEvent.php 文件

我们可以打开看看...

namespace App \ Events ; 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 ; class OrderEvent use Dispatchable , InteractsWithSockets , SerializesModels ; * Create a new event instance. * @return void public function __construct ( ) * Get the channels the event should broadcast on. * @return \Illuminate\Broadcasting\Channel|array public function broadcastOn ( ) return new PrivateChannel ( 'channel-name' ); 复制代码

简单的修改下构造函数，因为到时候我们可能会传入购买商品的用户

namespace App \ Events ; use App \ User ; 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 ; class OrderEvent use Dispatchable , InteractsWithSockets , SerializesModels ; public $user ; * Create a new event instance. * @return void public function __construct ( User $user ) $this ->user = $user ; * Get the channels the event should broadcast on. * @return \Illuminate\Broadcasting\Channel|array public function broadcastOn ( ) return new PrivateChannel ( 'channel-name' ); 复制代码

3.2 绑定事件

打开 app/Providers/EventServiceProvider.php 文件，找到成员属性 listen下：

    protected $listen = [
        Registered::class => [
            SendEmailVerificationNotification::class,
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把事件关联起来，修改为：

    protected $listen = [
        Registered::class => [
            SendEmailVerificationNotification::class,
        'App\Events\OrderEvent' => [
            'App\Listeners\sendModel',
            'App\Listeners\sendPhone',
复制代码

接着打开终端，执行 artisan 命令生成监听文件

php artisan event:generate
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然后我们可以在 app/Listeners 文件下发现多了两个文件

打开这两个文件，依次修改为：

sendModel.php:

namespace App \ Listeners ; use App \ Events \ OrderEvent ; use Illuminate \ Queue \ InteractsWithQueue ; use Illuminate \ Contracts \ Queue \ ShouldQueue ; class sendModel * Create the event listener. * @return void public function __construct ( ) * Handle the event. * @param OrderEvent $event * @return void public function handle ( OrderEvent $event ) $user = $event ->user; // @todo: 当前用户 //@todo：发送消息模板逻辑 dump ( '发送消息模板成功' ); 复制代码

sendPhone.php:

namespace App \ Listeners ; use App \ Events \ OrderEvent ; use Illuminate \ Queue \ InteractsWithQueue ; use Illuminate \ Contracts \ Queue \ ShouldQueue ; class sendPhone * Create the event listener. * @return void public function __construct ( ) * Handle the event. * @param OrderEvent $event * @return void public function handle ( OrderEvent $event ) $user = $event ->user; // @todo: 当前用户 //@todo：发送短信消息 dump ( '发送短信消息成功' ); 复制代码

3.3 最后我们再打开 OrderController.php 修改为:

namespace App \ Http \ Controllers ; use App \ Events \ OrderEvent ; use App \ User ; use Illuminate \ Http \ Request ; class OrderController extends Controller public function sendGoods ( ) $user = User :: find ( 1 ); //@todo:发货逻辑 dump ( '发货成功!!' ); event ( new OrderEvent ( $user )); 复制代码

3.4 绑定路由

Route::get('/sendGoods','OrderController@sendGoods');
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3.5 访问路由结果：

4. 总结

这样是不是简单，便于维护了许多呢... 还不会的小伙伴赶紧去试试吧！如果对你有帮助，请给个赞，谢谢！