Laravel事件处理

php artisan make:event <event-class> 

在这里，<event-class>应使用事件类的名称来代替。创建的类将被存储在 app\Events 目录。

第2步 - 创建一个处理类来处理创建的事件。

php artisan handler:event <handler-class> --event = <event-class> 

在这里，<event-class>应使用我们在步骤1来代替应，<handler-class> 创建事件类的名称使用处理程序类的名称来取代。新创建的处理程序类将被存储在app\Handlers\Events 目录。

现在，我们需要注册该事件在文件 - app\Providers\EventServiceProvier.php。 此文件包含一个数组：$listen。在这个数组，我们需要事件类添加作为键以及事件处理程序类作为它的值。

最后一步是触发使用事件门面触发事伯。fire()方法由事件类的对象调用。事件可以触发如下 -

Event::fire(<Event Class Object>);

实例

php artisan make:controller CreateStudentController 

第2步 - 成功执行后，您会收到以下输出 -

app/Http/Controllers/CreateStudentController.php

<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use DB;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use App\Events\StudentAdded;
use Event;

class CreateStudentController extends Controller {
   public function insertform(){
      return view('stud_add');
   }
   
   public function insert(Request $request){
      $name = $request->input('stud_name');
      $age = $request->input('stud_age');
DB::insert('insert into student (name,age) values(?, ?)',[$name, $age]);
      echo "Record inserted successfully.<br/>";
      echo '<a href = "/event">Click Here</a> to go back.';
      //firing an event
      Event::fire(new StudentAdded($name));
   }
}

php artisan make:event StudentAdded

第5步 - 成功执行后，您会收到以下输出 -

App\Events\StudentAdded.php

<?php
namespace App\Events;
use App\Events\Event;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;

class StudentAdded extends Event {
   use SerializesModels;
   public $name;
  
   public function __construct($name) {
      $this->name = $name;
   }
   public function broadcastOn() {
      return [];
   }
}

第9步 - 创建一个事件处理文件在 app\Handlers\Events\HandleNewStudentAdded.php，复制以下代码到该文件中。

app\Handlers\Events\HandleNewStudentAdded.php

<?php
namespace App\Handlers\Events;
use App\Events\StudentAdded;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Contracts\Queue\ShouldQueue;

class HandleNewStudentAdded {
   protected $name;
   
   public function __construct() {
      //
   }
   public function handle(StudentAdded $event) {
      $this->name = $event->name;
      echo "<br><u>New Student added in database with name: </u>".$this->name;
   }
} 

第10步 - 现在，我们需要添加事件类和处理程序类存储在文件 - app\Providers\EventServiceProvider.php

app\Providers\EventServiceProvider.php

<?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\SomeEvent' => [
         'App\Listeners\EventListener',
      ],
   
      'App\Events\StudentAdded' => [
         'App\Handlers\Events\HandleNewStudentAdded',
      ],
   ];
   /**
   * Register any other events for your application.
   *
   * @param \Illuminate\Contracts\Events\Dispatcher $events
   * @return void
   */
   public function boot(DispatcherContract $events) {
      parent::boot($events);
      //
   }
}

app/Http/routes.php

Route::get('event','CreateStudentController@insertform');
Route::post('addstudent','CreateStudentController@insert');

http://localhost:8000/event

第13步 - 访问上述网址后，您会收到以下输出 -

第14步 - 增加学生的姓名，然后点击“添加学生”按钮，将您重定向到下面的屏幕。看看灰色高亮行。 我们已经指定处理方法，在一个事件被触发执行HandleNewStudentAdded类的处理方法时添加此行。