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    Zend Framework教程之动作的基类Zend_Controller_Action详解_PHP

    2016-05-28 11:47:56原创303
    本文实例讲述了Zend Framework教程之动作的基类Zend_Controller_Action。分享给大家供大家参考,具体如下:

    Zend_Controller_Action的实现

    Zend Framework的动作控制器需要继承Zend_Controller_Action,Zend_Controller_Action提供了动作控制器的基本功能,具体参考如下代码:

    Zend_Controller_Action_Interface

    <?php
    interface Zend_Controller_Action_Interface
    {
      /**
       * Class constructor
       *
       * The request and response objects should be registered with the
       * controller, as should be any additional optional arguments; these will be
       * available via {@link getRequest()}, {@link getResponse()}, and
       * {@link getInvokeArgs()}, respectively.
       *
       * When overriding the constructor, please consider this usage as a best
       * practice and ensure that each is registered appropriately; the easiest
       * way to do so is to simply call parent::__construct($request, $response,
       * $invokeArgs).
       *
       * After the request, response, and invokeArgs are set, the
       * {@link $_helper helper broker} is initialized.
       *
       * Finally, {@link init()} is called as the final action of
       * instantiation, and may be safely overridden to perform initialization
       * tasks; as a general rule, override {@link init()} instead of the
       * constructor to customize an action controller's instantiation.
       *
       * @param Zend_Controller_Request_Abstract $request
       * @param Zend_Controller_Response_Abstract $response
       * @param array $invokeArgs Any additional invocation arguments
       * @return void
       */
      public function __construct(Zend_Controller_Request_Abstract $request,
                    Zend_Controller_Response_Abstract $response,
                    array $invokeArgs = array());
      /**
       * Dispatch the requested action
       *
       * @param string $action Method name of action
       * @return void
       */
      public function dispatch($action);
    }
    
    

    Zend_Controller_Action

    <?php
    require_once 'Zend/Controller/Action/HelperBroker.php';
    require_once 'Zend/Controller/Action/Interface.php';
    require_once 'Zend/Controller/Front.php';
    abstract class Zend_Controller_Action implements Zend_Controller_Action_Interface
    {
      protected $_classMethods;
      protected $_delimiters;
      protected $_invokeArgs = array();
      protected $_frontController;
      protected $_request = null;
      protected $_response = null;
      public $viewSuffix = 'phtml';
      public $view;
      protected $_helper = null;
      public function __construct(Zend_Controller_Request_Abstract $request, Zend_Controller_Response_Abstract $response, array $invokeArgs = array())
      {
        $this->setRequest($request)
           ->setResponse($response)
           ->_setInvokeArgs($invokeArgs);
        $this->_helper = new Zend_Controller_Action_HelperBroker($this);
        $this->init();
      }
      public function init()
      {
      }
      public function initView()
      {
        if (!$this->getInvokeArg('noViewRenderer') && $this->_helper->hasHelper('viewRenderer')) {
          return $this->view;
        }
        require_once 'Zend/View/Interface.php';
        if (isset($this->view) && ($this->view instanceof Zend_View_Interface)) {
          return $this->view;
        }
        $request = $this->getRequest();
        $module = $request->getModuleName();
        $dirs  = $this->getFrontController()->getControllerDirectory();
        if (empty($module) || !isset($dirs[$module])) {
          $module = $this->getFrontController()->getDispatcher()->getDefaultModule();
        }
        $baseDir = dirname($dirs[$module]) . DIRECTORY_SEPARATOR . 'views';
        if (!file_exists($baseDir) || !is_dir($baseDir)) {
          require_once 'Zend/Controller/Exception.php';
          throw new Zend_Controller_Exception('Missing base view directory ("' . $baseDir . '")');
        }
        require_once 'Zend/View.php';
        $this->view = new Zend_View(array('basePath' => $baseDir));
        return $this->view;
      }
      public function render($action = null, $name = null, $noController = false)
      {
        if (!$this->getInvokeArg('noViewRenderer') && $this->_helper->hasHelper('viewRenderer')) {
          return $this->_helper->viewRenderer->render($action, $name, $noController);
        }
        $view  = $this->initView();
        $script = $this->getViewScript($action, $noController);
        $this->getResponse()->appendBody(
          $view->render($script),
          $name
        );
      }
      public function renderScript($script, $name = null)
      {
        if (!$this->getInvokeArg('noViewRenderer') && $this->_helper->hasHelper('viewRenderer')) {
          return $this->_helper->viewRenderer->renderScript($script, $name);
        }
        $view = $this->initView();
        $this->getResponse()->appendBody(
          $view->render($script),
          $name
        );
      }
      public function getViewScript($action = null, $noController = null)
      {
        if (!$this->getInvokeArg('noViewRenderer') && $this->_helper->hasHelper('viewRenderer')) {
          $viewRenderer = $this->_helper->getHelper('viewRenderer');
          if (null !== $noController) {
            $viewRenderer->setNoController($noController);
          }
          return $viewRenderer->getViewScript($action);
        }
        $request = $this->getRequest();
        if (null === $action) {
          $action = $request->getActionName();
        } elseif (!is_string($action)) {
          require_once 'Zend/Controller/Exception.php';
          throw new Zend_Controller_Exception('Invalid action specifier for view render');
        }
        if (null === $this->_delimiters) {
          $dispatcher = Zend_Controller_Front::getInstance()->getDispatcher();
          $wordDelimiters = $dispatcher->getWordDelimiter();
          $pathDelimiters = $dispatcher->getPathDelimiter();
          $this->_delimiters = array_unique(array_merge($wordDelimiters, (array) $pathDelimiters));
        }
        $action = str_replace($this->_delimiters, '-', $action);
        $script = $action . '.' . $this->viewSuffix;
        if (!$noController) {
          $controller = $request->getControllerName();
          $controller = str_replace($this->_delimiters, '-', $controller);
          $script = $controller . DIRECTORY_SEPARATOR . $script;
        }
        return $script;
      }
      public function getRequest()
      {
        return $this->_request;
      }
      public function setRequest(Zend_Controller_Request_Abstract $request)
      {
        $this->_request = $request;
        return $this;
      }
      public function getResponse()
      {
        return $this->_response;
      }
      public function setResponse(Zend_Controller_Response_Abstract $response)
      {
        $this->_response = $response;
        return $this;
      }
      protected function _setInvokeArgs(array $args = array())
      {
        $this->_invokeArgs = $args;
        return $this;
      }
      public function getInvokeArgs()
      {
        return $this->_invokeArgs;
      }
      public function getInvokeArg($key)
      {
        if (isset($this->_invokeArgs[$key])) {
          return $this->_invokeArgs[$key];
        }
        return null;
      }
      public function getHelper($helperName)
      {
        return $this->_helper->{$helperName};
      }
      public function getHelperCopy($helperName)
      {
        return clone $this->_helper->{$helperName};
      }
      public function setFrontController(Zend_Controller_Front $front)
      {
        $this->_frontController = $front;
        return $this;
      }
      public function getFrontController()
      {
        // Used cache version if found
        if (null !== $this->_frontController) {
          return $this->_frontController;
        }
        // Grab singleton instance, if class has been loaded
        if (class_exists('Zend_Controller_Front')) {
          $this->_frontController = Zend_Controller_Front::getInstance();
          return $this->_frontController;
        }
        // Throw exception in all other cases
        require_once 'Zend/Controller/Exception.php';
        throw new Zend_Controller_Exception('Front controller class has not been loaded');
      }
      public function preDispatch()
      {
      }
      public function postDispatch()
      {
      }
      public function __call($methodName, $args)
      {
        require_once 'Zend/Controller/Action/Exception.php';
        if ('Action' == substr($methodName, -6)) {
          $action = substr($methodName, 0, strlen($methodName) - 6);
          throw new Zend_Controller_Action_Exception(sprintf('Action "%s" does not exist and was not trapped in __call()', $action), 404);
        }
        throw new Zend_Controller_Action_Exception(sprintf('Method "%s" does not exist and was not trapped in __call()', $methodName), 500);
      }
      public function dispatch($action)
      {
        // Notify helpers of action preDispatch state
        $this->_helper->notifyPreDispatch();
        $this->preDispatch();
        if ($this->getRequest()->isDispatched()) {
          if (null === $this->_classMethods) {
            $this->_classMethods = get_class_methods($this);
          }
          // If pre-dispatch hooks introduced a redirect then stop dispatch
          // @see ZF-7496
          if (!($this->getResponse()->isRedirect())) {
            // preDispatch() didn't change the action, so we can continue
            if ($this->getInvokeArg('useCaseSensitiveActions') || in_array($action, $this->_classMethods)) {
              if ($this->getInvokeArg('useCaseSensitiveActions')) {
                trigger_error('Using case sensitive actions without word separators is deprecated; please do not rely on this "feature"');
              }
              $this->$action();
            } else {
              $this->__call($action, array());
            }
          }
          $this->postDispatch();
        }
        // whats actually important here is that this action controller is
        // shutting down, regardless of dispatching; notify the helpers of this
        // state
        $this->_helper->notifyPostDispatch();
      }
      public function run(Zend_Controller_Request_Abstract $request = null, Zend_Controller_Response_Abstract $response = null)
      {
        if (null !== $request) {
          $this->setRequest($request);
        } else {
          $request = $this->getRequest();
        }
        if (null !== $response) {
          $this->setResponse($response);
        }
        $action = $request->getActionName();
        if (empty($action)) {
          $action = 'index';
        }
        $action = $action . 'Action';
        $request->setDispatched(true);
        $this->dispatch($action);
        return $this->getResponse();
      }
      protected function _getParam($paramName, $default = null)
      {
        $value = $this->getRequest()->getParam($paramName);
         if ((null === $value || '' === $value) && (null !== $default)) {
          $value = $default;
        }
        return $value;
      }
      protected function _setParam($paramName, $value)
      {
        $this->getRequest()->setParam($paramName, $value);
        return $this;
      }
      protected function _hasParam($paramName)
      {
        return null !== $this->getRequest()->getParam($paramName);
      }
      protected function _getAllParams()
      {
        return $this->getRequest()->getParams();
      }
      final protected function _forward($action, $controller = null, $module = null, array $params = null)
      {
        $request = $this->getRequest();
        if (null !== $params) {
          $request->setParams($params);
        }
        if (null !== $controller) {
          $request->setControllerName($controller);
          // Module should only be reset if controller has been specified
          if (null !== $module) {
            $request->setModuleName($module);
          }
        }
        $request->setActionName($action)
            ->setDispatched(false);
      }
      protected function _redirect($url, array $options = array())
      {
        $this->_helper->redirector->gotoUrl($url, $options);
      }
    }
    
    

    Zend_Controller_Action提供了动作和视图的render功能,以及注册请求和响应对象,常用助手等等。

    动作控制器的常用方法

    在动作控制器中常用的方法和属性如下:

    $this->_helper主要完成助手的相关操作例如:

    // 只是局部控制器;当初始化加载时,对这个控制器的所有动作有效:
    $this->_helper->viewRenderer->setNoRender(true);
    // 全局:
    $this->_helper->removeHelper('viewRenderer');
     // 也是全局,但需要和本地版本协作,以便繁殖这个控制器:
    Zend_Controller_Front::getInstance()->setParam('noViewRenderer', true);
    

    通过设置ViewRenderer的noRender标记,可以简单地为一个独立的视图禁止解析(rendering):

    class FooController extends Zend_Controller_Action
    {
      public function barAction()
      {
        // disable autorendering for this action only:
        $this->_helper->viewRenderer->setNoRender();
      }
    }
    
    

    禁止ViewRenderer的主要原因是如果你不需要视图对象或者如果你不通过视图脚本(例如,当使用动作控制器来司服网站服务协议如SOAP,XML-RPC或REST)来解析。大多数情况下,你不需要全局地禁止ViewRenderer,只选择性地在个别控制器或动作里禁止它。

    请求对象和响应对象的相关操作

    无数的对象和变量与对象一起注册,并且每个都有访问器方法。

    请求对象:getRequest()可用来读取调用动作请求对象。

    响应对象: getResponse()可用来读取收集最终响应的响应对象。一些典型的调用看起来象这样:

    $this->getResponse()->setHeader('Content-Type', 'text/xml');
    $this->getResponse()->appendBody($content);
    
    

    调用参数:前端控制器可能把参数传给路由器、派遣器和动作控制器。为了读取这些参数,可使用getInvokeArg($key);另外,用getInvokeArgs()读取整个参数列表。

    请求参数:请求对象手机请求参数,如任何_GET 或 _POST 参数,或者指定在URL的路径信息里的用户参数。为了读取这些参数,可使用_getParam($key)或_getAllParams()。也可以用_setParam()来设置请求参数;当转发到另外的动作时这很有用。

    用_hasParam($key)来测试是否一个参数存在(对逻辑分支有用)。

    Note: _getParam()可带有一个可选的第二个参数,如果它不是空的,就包含一个缺省的值。用它在读取值之前来消除对_hasParam() 的调用:

    // Use default value of 1 if id is not set
    $id = $this->_getParam('id', 1);
    // Instead of:
    if ($this->_hasParam('id') {
      $id = $this->_getParam('id');
    } else {
      $id = 1;
    }
    
    

    视图的相关操作

    Zend_Controller_Action为视图继承提供了一个初步的灵活的机制。有两个方法来完成这个:initView() 和 render();前者松散地加载$view public 属性,后者基于当前请求的动作来解析视图,它们使用目录层次来决定脚本路径。

    视图初始化

    initView()初始化视图对象。为了读取视图对象,render()调用initView(),但它可以在任何时候被初始化;缺省地,它用Zend_View对象来组装$view属性,但任何实现Zend_View_Interface的类可以使用。如果$view已经被初始化,它就简单地返回属性。

    缺省的实现使用下面假设的目录结构:

    applicationOrModule/
    controllers/
    IndexController.php
    views/
    scripts/
    index/
    index.phtml
    helpers/
    filters/

    换句话说,视图脚本假定放在views/scripts/子目录,同时假定 views子目录还包含兄弟功能(助手和过滤器)。确定视图脚本名称和路径时,先以 views/scripts/作为基路径,然后加上以视图脚本对应控制器命名的目录。

    解析(Rendering)视图

    render() 有下列特征:has the following signature:

    string render(string $action = null,
           string $name = null,
           bool $noController = false);
    
    

    render()解析视图脚本。如果没有传递参数,它假定请求的脚本是[controller]/[action].phtml (.phtml是$viewSuffix属性的值)。为$action传递一个值将解析在[controller]子目录中的模板。为用[controller]重写,传递一个true值给$noController。最后,模板被解析到响应对象;如果你希望解析到一个在响应对象里指定的named segment,传递一个值给$name。

    Note: 因为控制器和动作名字里可能包含分隔符如'_'、 '.' 和 '-',当决定视图名字时,render()把它们规格化成 '-'.在内部,它使用派遣器的字和路径分隔符来做规格化。这样,对/foo.bar/baz-bat的请求将解析脚本foo-bar/baz-bat.phtml。如果动作方法包含camelCasing,记住当决定视图脚本文件名的时候,这将变成由'-'分隔的字。

    一些例子:

    class MyController extends Zend_Controller_Action
    {
      public function fooAction()
      {
        // Renders my/foo.phtml
        $this->render();
        // Renders my/bar.phtml
        $this->render('bar');
        // Renders baz.phtml
        $this->render('baz', null, true);
        // Renders my/login.phtml to the 'form' segment of the
        // response object
        $this->render('login', 'form');
        // Renders site.phtml to the 'page' segment of the response
        // object; does not use the 'my/' subirectory
        $this->render('site', 'page', true);
      }
      public function bazBatAction()
      {
        // Renders my/baz-bat.phtml
        $this->render();
      }
    }
    
    

    其它

    _forward($action, $controller = null, $module = null, array $params = null) :执行另外一个动作。如果在preDispatch()里调用,当前请求的动作将被跳过来支持新的动作。否则,在当前动作被处理之后,在_forward()请求的动作将被执行。

    _redirect($url, array $options = array()):重定向到另外一个地方。这个方法用URL和一组可选的选项。缺省地,它执行HTTP 302 重定向。

    选项可包括一个或多个下面这些:

    exit:是否立即退出。如果被请求,它将干净地关闭任何打开的会话和执行重定向。

    可以用setRedirectExit()访问器在控制器里全局地设置这个选项。

    prependBase:是否预先考虑基础URL和URL提供的请求对象一起注册。

    使用setRedirectPrependBase()访问器,在控制器里全局地设置这个选项。

    code:在重定向时要用什么HTTP代码。缺省使用302;可以用从301到306之间的任何代码。

    使用setRedirectCode()访问器,在控制器里全局地设置这个选项。

    扩展自定义Zend_Controller_Action

    为了创建动作控制器,设计上,Zend_Controller_Action 必须被继承。至少,需要定义控制器可能调用的动作方法。

    除了为web应用程序创建有用的函数外,你可能发现在不同的控制器里重复同样的设置和实用方法;如果这样,创建一个继承(extends)Zend_Controller_Action 的基础类可能会解决问题。

    Example #1 如何处理不存在的动作

    如果控制器的请求包括一个未定义的动作方法,Zend_Controller_Action::__call()将被调用。__call()当然是PHP中用来重载方法的魔术方法。

    缺省地,这个方法抛出一个Zend_Controller_Action_Exception 来表明在控制器里没有发现要求的方法。如果要求的方法以'Action'结尾,就假设一个动作被请求并且不存在;这样的错误导致带有代码为 404 的异常。所有其它方法导致带有代码为 500 的异常。这使你很容易地在错误句柄里区分是页面没有发现还是程序错误。

    如果想执行其它操作,你应该重写这个函数。例如,如果你想显示错误信息,可以象下面这样来写:

    class MyController extends Zend_Controller_Action
    {
      public function __call($method, $args)
      {
        if ('Action' == substr($method, -6)) {
          // If the action method was not found, render the error
          // template
          return $this->render('error');
        }
        // all other methods throw an exception
        throw new Exception('Invalid method "'
                  . $method
                  . '" called',
                  500);
      }
    }
    
    

    另外的可能性就是你可能想转发到缺省控制页面:

    class MyController extends Zend_Controller_Action
    {
      public function indexAction()
      {
        $this->render();
      }
      public function __call($method, $args)
      {
        if ('Action' == substr($method, -6)) {
          // If the action method was not found, forward to the
          // index action
          return $this->_forward('index');
        }
        // all other methods throw an exception
        throw new Exception('Invalid method "'
                  . $method
                  . '" called',
                  500);
      }
    }
    
    

    为了定制控制器,除了重写__call()以外,本章前面说涉及的初始化、实用程序、访问器、视图和派遣钩子等方法都可以被重写。作为例子,如果把视图对象保存到注册表里,你可能想用象下面的代码来修改initView():

    abstract class My_Base_Controller extends Zend_Controller_Action
    {
      public function initView()
      {
        if (null === $this->view) {
          if (Zend_Registry::isRegistered('view')) {
            $this->view = Zend_Registry::get('view');
          } else {
            $this->view = new Zend_View();
            $this->view->setBasePath(dirname(__FILE__) . '/../views');
          }
        }
        return $this->view;
      }
    }
    
    

    更多关于zend相关内容感兴趣的读者可查看本站专题:《Zend FrameWork框架入门教程》、《php优秀开发框架总结》、《Yii框架入门及常用技巧总结》、《ThinkPHP入门教程》、《php面向对象程序设计入门教程》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

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