laravel创建服务提供者实例

  1. 在app\Contracts(自己创建)下创建TestContract.php

    namespace App\Contracts;
    
    interface TestContract {
        public function callMe($controller);
    }
  2. 在app\Services下创建TestService.php

    namespace App\Services;
    
    use App\Contracts\TestContract;
    
        class TestService implements TestContract {
        public function callMe($controller) {
            dd('Call Me From TestServiceProvider In '.$controller);
        }
    }

    3.在app\Providers下创建TestServiceProvider.php

    <?php
    
    namespace App\Providers;
    
    use Illuminate\Support\ServiceProvider;
    use App\Services\TestService;
    
    class TestServiceProvider extends ServiceProvider {
        /** * Bootstrap the application services. * * @return void */
        public function boot() {
            //
        }
    
        /** * Register the application services. * * @return void * @author LaravelAcademy.org */
        public function register() {
            //使用singleton绑定单例
            $this->app->singleton('test',function(){
                return new TestService();
            });
    
            //使用bind绑定实例到接口以便依赖注入
            $this->app->bind('App\Contracts\TestContract',function(){
                return new TestService();
            });
        }
    }

    4.在config/app.php的providers数组中追加

     App\Providers\TestServiceProvider::class,

    5.创建TestController.php

    <?php
    
    namespace App\Http\Controllers;
    
    use Illuminate\Http\Request;
    
    use App\Http\Requests;
    use App\Http\Controllers\Controller;
    
    use App;
    use App\Contracts\TestContract;
    
    class TestController extends Controller {
        //依赖注入
        public function __construct(TestContract $test){
            $this->test = $test;
        }
    
        /** * Display a listing of the resource. * * @return Response * @author LaravelAcademy.org */
        public function index() {
            // $test = App::make('test');
            // $test->callMe('TestController');
            $this->test->callMe('TestController');
        }
    
    //其他控制器动作
    }

    6.输出

"Call Me From TestServiceProvider In TestController"

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