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"