如何使serviceManager在类zf2上工作

我在module.php上定义了一些服务，这些服务按预期的方式声明为：

public function getServiceConfig()
{
    return array(
        'factories' => array(
            'Marketplace\V1\Rest\Service\ServiceCollection' =>  function($sm) {
                    $tableGateway = $sm->get('ServiceCollectionGateway');
                    $table = new ServiceCollection($tableGateway);
                    return $table;
                },
            'ServiceCollectionGateway' => function ($sm) {
                    $dbAdapter = $sm->get('PdoAdapter');
                    $resultSetPrototype = new ResultSet();
                    $resultSetPrototype->setArrayObjectPrototype(new ServiceEntity());
                    return new TableGateway('service', $dbAdapter, null, $resultSetPrototype);
                },
            'Marketplace\V1\Rest\User\UserCollection' =>  function($sm) {
                    $tableGateway = $sm->get('UserCollectionGateway');
                    $table = new UserCollection($tableGateway);
                    return $table;
                },
            'UserCollectionGateway' => function ($sm) {
                    $dbAdapter = $sm->get('PdoAdapter');
                    $resultSetPrototype = new ResultSet();
                    $resultSetPrototype->setArrayObjectPrototype(new UserEntity());
                    return new TableGateway('user', $dbAdapter, null, $resultSetPrototype);
                },
        ),
    );
}

我用它们将我的数据库表映射到一个对象。从项目的主类中，我可以毫无问题地访问它们。看一下我的项目文件树：

例如，userResource.php扩展了abstractResource，此函数有效：

public function fetch($id)
{
    $result = $this->getUserCollection()->findOne(['id'=>$id]);
    return $result;
}

在ResourceAbstract内部，我有：

<?php

namespace Marketplace\V1\Abstracts;

use ZF\Rest\AbstractResourceListener;
use Zend\ServiceManager\ServiceLocatorAwareInterface;
use Zend\ServiceManager\ServiceLocatorInterface;

class ResourceAbstract extends AbstractResourceListener implements ServiceLocatorAwareInterface {

    protected $serviceLocator;


    public function getServiceCollection() {
        $sm = $this->getServiceLocator();
        return $sm->get('Marketplace\V1\Rest\Service\ServiceCollection');
    }

    public function getUserCollection() {
        $sm = $this->getServiceLocator();
        return $sm->get('Marketplace\V1\Rest\User\UserCollection');
    }

    public function setServiceLocator(ServiceLocatorInterface $serviceLocator) {
        $this->serviceLocator = $serviceLocator;
    }

    public function getServiceLocator() {
        return $this->serviceLocator;
    }

} 

正如Zf2文档所建议的那样，我需要实现ServiceLocatorAwareInterface才能使用serviceManager。到目前为止，一切都很好。然后，我决定添加一个新类，称为Auth。

此类与abstractResource差别不大，它在loginController中这样调用：

<?php
namespace Marketplace\V1\Rpc\Login;

use Zend\Mvc\Controller\AbstractActionController;
use Marketplace\V1\Functions\Auth;

class LoginController extends AbstractActionController
{
    public function loginAction()
    {
        $auth = new Auth();
        $data = $this->params()->fromPost();
        var_dump($auth->checkPassword($data['email'], $data['password']));

        die;
    }


}

这是Auth：

<?php

namespace Marketplace\V1\Functions;


use Zend\ServiceManager\ServiceLocatorAwareInterface;
use Zend\ServiceManager\ServiceLocatorInterface;

class Auth implements ServiceLocatorAwareInterface {

    protected $serviceLocator;

    public function setServiceLocator(ServiceLocatorInterface $serviceLocator) {
        $this->serviceLocator = $serviceLocator;
    }

    public function getServiceLocator() {
        return $this->serviceLocator;
    }

    public function checkPassword($email, $rawPassword) {

        $user = $this->getServiceLocator()->get('Marketplace\V1\Rest\User\UserCollection')->findByEmail($email);
        if($user)
            return false;

        $result = $this->genPassword($rawPassword, $user->salt);

        if($result['password'] === $user->password)
            return true;
        else
            return false;

    }

    public function genPassword($rawPassword, $salt = null) {
        if(!$salt)
            $salt = mcrypt_create_iv(22, MCRYPT_DEV_URANDOM);
        $options = [
            'cost' => 11,
            'salt' => $salt,
        ];
        return ['password' => password_hash($rawPassword, PASSWORD_BCRYPT, $options), 'salt' => bin2hex($salt)];
    }

}

如您所见，它遵循与abtractResource相同的路径，但在这种情况下，当我执行loginController时，我得到一个错误：

Fatal error</b>:  Call to a member function get() on null in C:\WT-NMP\WWW\MarketPlaceApi\module\Marketplace\src\Marketplace\V1\Functions\Auth.php on line 25

那指的是这一行： $user = $this->getServiceLocator()->get('Marketplace\V1\Rest\User\UserCollection')->findByEmail($email);

这意味着getServiceLocator为空。为什么我不能让serviceLocator在Auth类上工作，但是我可以在abstractResource中工作呢？