Php 定义的控制器在Laravel 5中不存在

我定义了控制器LoginController，但出现此错误

Route.php第264行中的ReflectionException:Class App\Http\Controllers\LoginController不存在

class LoginController extends Controller {

  // Display the login form
  public function showLogin()
  {
    return View::make('login');
  }

  // Process submission of the login form by verifying user’s credentials
  public function processLogin()
  {
    $username = Input::get('username');
    $password = Input::get('password');
    if ($username === 'prince' && $password === 'c@spiAN') {
      return 'Access granted!';
    } else {
      return 'Access denied! Wrong username or password.';
    }
  }
}

---

重新安装laravel修复了错误，甚至没有添加任何内容。
您是否在控制器中放置了名称空间（“名称空间App\Http\Controllers”）？您能更新控制器的完整代码吗？
<?php namespace App\Http\Controllers;

use App\Http\Controllers\Controller;
use App\User;

class LoginController extends Controller {
// Display the login form
public function showLogin()
{
  return View::make('login');
}

// Process submission of the login form by verifying user’s credentials
public function processLogin()
{
  $username = Input::get('username');
  $password = Input::get('password');
  if ($username === 'prince' && $password === 'c@spiAN') {
    return 'Access granted!';
  } else {
  return 'Access denied! Wrong username or password.';
  }
 }
}