php artisan make:controller HelloController

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class HelloController extends Controller
{
    public function index()
    {
        echo ‘服务调用‘;
    }
}

php artisan make:provider HelloServiceProvider

<?php

namespace App\Providers;

use App\Http\Controllers\HelloController;
use Illuminate\Support\ServiceProvider;

class HelloServiceProvider extends ServiceProvider
{
    /**
     * Register services.
     *
     * @return void
     */
    public function register()
    {
        //注册服务提供者，单例模式
        $this->app->singleton(‘hello‘, function () {
            return new HelloController();
        });

        //或者
        // $this->app->bind(‘hello‘, HelloController::class);
    }

    /**
     * Bootstrap services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }
}

‘providers‘ => [
       ...  
        App\Providers\HelloServiceProvider::class,
    ],

Route::get("helloservice",function(){
    app("hello")->index();
});