Zend Framework教程之动作的基类Zend_Controller_Action详解

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

<?phpinterface 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

<?phprequire_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);  }}