Laravel 8 - 目标类不存在

当无涯教程在路由中调用控制器ProductController时，会发现以下问题: "Target class [ProductController] does not exist"

你也可以看到下面的截图。

实际上这不是错误，是因为laravel 8从RouteServiceProvider.php文件中删除了默认名称空间。

无涯教程可以在路由文件中指定，也可以在RouteServiceProvider.php文件中定义默认名称空间。一起来看看这两种解决方案。

解决方案1:在路由文件中使用

routes/web.php

<?php
  
use Illuminate\Support\Facades\Route;
  
use App\Http\Controllers\ProductController;
use App\Http\Controllers\PostController;
  
/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/
  
Route::get('/'， function () {
    return view('welcome');
});
  
Route::resource('products'， ProductController::class);
  
Route::get('posts'， [PostController::class， 'index']);

解决方案2:在RouteserviceProvider 中定义

第二种解决方案是您可以将laravel定义为旧版本。所以将其定义为:app/Http/Providers/RouteServiceProvider.php

<?php
  
namespace App\Providers;
  
use Illuminate\Cache\RateLimiting\Limit;
use Illuminate\Foundation\Support\Providers\RouteServiceProvider as ServiceProvider;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\RateLimiter;
use Illuminate\Support\Facades\Route;
  
class RouteServiceProvider extends ServiceProvider
{
    /**
     * The path to the "home" route for your application.
     *
     * This is used by Laravel authentication to redirect users after login.
     *
     * @var string
     */
    public const HOME = '/home';
    protected $namespace = 'App\Http\Controllers';
  
    /**
     * Define your route model bindings， pattern filters， etc.
     *
     * @return void
     */
    public function boot()
    {
        $this->configureRateLimiting();
  
        $this->routes(function () {
            Route::middleware('web')
                ->namespace($this->namespace)
                ->group(base_path('routes/web.php'));
  
            Route::prefix('api')
                ->middleware('api')
                ->group(base_path('routes/api.php'));
        });
    }
  
    ....

routes/web.php    

<?php
  
use Illuminate\Support\Facades\Route;
  
/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/
  
Route::get('/'， function () {
    return view('welcome');
});
  
Route::resource('products'， 'ProductController');
  
Route::get('posts'， 'PostController@index');