提交注册代码报错 "Class App\Http\Controllers\Requests does not exist"？

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\Models\User;

class UsersController extends Controller
{
public function create(){
return view('users.create');
}

public function show(User $user){
    return view('users.show', compact('user'));
}

public function store(Requests $requests){
    $this->validate($requests,[
        'name'      =>  'required|max:50',
        'email'     =>  'required|unique:users|max:255',
        'password'  =>  'required|confirmed|min:6'
    ]);
    return;
}

}