我正在做一些简单的博客网站的实践，我试图显示webroot/img/xxx/abc.（jpg，jpeg，png）内上传的文件.在控制器中，我可以上传文件，并添加在DB中，但不能显示它的视图文件，我不知道为什么.
这是我想显示我上传的文件的地方（view.php）

<td><?= $this->Html->image($post->titleImg_file_name, ["height"=> 50, "width"=>50]) ?></td>

这是我上传文件的控制器。

public function add()
{
    $post = $this->Posts->newEmptyEntity();

    if ($this->request->is('post')) {
        $post = $this->Posts->patchEntity($post, $this->request->getData());
        $file = $this->request->getData("titleImg_file_name");
        // If no dir exits, make one
        $dir = realpath(WWW_ROOT . "img" . DS . date("Ymdhms"));
        if(!$dir){
            $dir = mkdir(WWW_ROOT . "img" . DS . date("Ymdhms"), 0744);
            $realPath = WWW_ROOT . "img" . DS . date("Ymdhms");
            move_uploaded_file($file["tmp_name"], $realPath.DS.$file["name"]);

            $post->titleImg_file_name = date("Ymdhms"). "/" .date("Ymdhms").$file["name"];

            // dd($post);

        }

        if ($this->Posts->save($post)) {
            $this->Flash->success(__('The post has been saved.'));

            return $this->redirect(['action' => 'index']);
        }
        $this->Flash->error(__('The post could not be saved. Please, try again.'));            
    }
    $users = $this->Posts->Users->find('list', ['limit' => 200]);
    $tags = $this->Posts->Tags->find('list', ['limit' => 200]);

    $this->set(compact('post', 'users',"tags"));
}

这是视图控制器。

public function view($id = null)
{
    $post = $this->Posts->get($id, [
        'contain' => ['Users'],
    ]);

    $this->set(compact('post'));
}

任何帮助我都将感激不尽。