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Zend Framework教程之分发器Zend_Controller_Dispatcher用法详解

转载 作者：qq735679552 更新时间：2022-09-28 22:32:09 26 4
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本文实例讲述了Zend Framework教程之分发器Zend_Controller_Dispatcher用法。分享给大家供大家参考，具体如下:

分发器的具体实现 。

Zend Framework的分发器Zend_Controller_Dispatcher设计主要有，如下类和接口组成:

├── Dispatcher │   ├── Abstract.php │   ├── Exception.php │   ├── Interface.php │   └── Standard.php 。

Zend_Controller_Dispatcher_Interface 。

定义了分发器提供的基本和标准功能.

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interface Zend_Controller_Dispatcher_Interface
{
   public function formatControllerName( $unformatted );
   public function formatModuleName( $unformatted );
   public function formatActionName( $unformatted );
   public function isDispatchable(Zend_Controller_Request_Abstract $request );
   public function setParam( $name , $value );
   public function setParams( array $params );
   public function getParam( $name );
   public function getParams();
   public function clearParams( $name = null);
   public function setResponse(Zend_Controller_Response_Abstract $response = null);
   public function getResponse();
   public function addControllerDirectory( $path , $args = null);
   public function setControllerDirectory( $path );
   public function getControllerDirectory();
   public function dispatch(Zend_Controller_Request_Abstract $request , Zend_Controller_Response_Abstract $response );
   public function isValidModule( $module );
   public function getDefaultModule();
   public function getDefaultControllerName();
   public function getDefaultAction();
}

Zend_Controller_Dispatcher_Abstract 。

实现了Zend_Controller_Dispatcher_Interface接口，提供了分发器提供的基本和标准功能的抽象父类.

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<?php
/** Zend_Controller_Dispatcher_Interface */
require_once 'Zend/Controller/Dispatcher/Interface.php' ;
abstract class Zend_Controller_Dispatcher_Abstract implements Zend_Controller_Dispatcher_Interface
{
   protected $_defaultAction = 'index' ;
   protected $_defaultController = 'index' ;
   protected $_defaultModule = 'default' ;
   protected $_frontController ;
   protected $_invokeParams = array ();
   protected $_pathDelimiter = '_' ;
   protected $_response = null;
   protected $_wordDelimiter = array ( '-' , '.' );
   public function __construct( array $params = array ())
   {
     $this ->setParams( $params );
   }
   public function formatControllerName( $unformatted )
   {
     return ucfirst( $this ->_formatName( $unformatted )) . 'Controller' ;
   }
   public function formatActionName( $unformatted )
   {
     $formatted = $this ->_formatName( $unformatted , true);
     return strtolower ( substr ( $formatted , 0, 1)) . substr ( $formatted , 1) . 'Action' ;
   }
   public function _verifyDelimiter( $spec )
   {
     if ( is_string ( $spec )) {
       return ( array ) $spec ;
     } elseif ( is_array ( $spec )) {
       $allStrings = true;
       foreach ( $spec as $delim ) {
         if (! is_string ( $delim )) {
           $allStrings = false;
           break ;
         }
       }
       if (! $allStrings ) {
         require_once 'Zend/Controller/Dispatcher/Exception.php' ;
         throw new Zend_Controller_Dispatcher_Exception( 'Word delimiter array must contain only strings' );
       }
       return $spec ;
     }
     require_once 'Zend/Controller/Dispatcher/Exception.php' ;
     throw new Zend_Controller_Dispatcher_Exception( 'Invalid word delimiter' );
   }
   public function getWordDelimiter()
   {
     return $this ->_wordDelimiter;
   }
   public function setWordDelimiter( $spec )
   {
     $spec = $this ->_verifyDelimiter( $spec );
     $this ->_wordDelimiter = $spec ;
     return $this ;
   }
   public function getPathDelimiter()
   {
     return $this ->_pathDelimiter;
   }
   public function setPathDelimiter( $spec )
   {
     if (! is_string ( $spec )) {
       require_once 'Zend/Controller/Dispatcher/Exception.php' ;
       throw new Zend_Controller_Dispatcher_Exception( 'Invalid path delimiter' );
     }
     $this ->_pathDelimiter = $spec ;
     return $this ;
   }
   protected function _formatName( $unformatted , $isAction = false)
   {
     // preserve directories
     if (! $isAction ) {
       $segments = explode ( $this ->getPathDelimiter(), $unformatted );
     } else {
       $segments = ( array ) $unformatted ;
     }
     foreach ( $segments as $key => $segment ) {
       $segment    = str_replace ( $this ->getWordDelimiter(), ' ' , strtolower ( $segment ));
       $segment    = preg_replace( '/[^a-z0-9 ]/' , '' , $segment );
       $segments [ $key ] = str_replace ( ' ' , '' , ucwords( $segment ));
     }
     return implode( '_' , $segments );
   }
   public function getFrontController()
   {
     if (null === $this ->_frontController) {
       require_once 'Zend/Controller/Front.php' ;
       $this ->_frontController = Zend_Controller_Front::getInstance();
     }
     return $this ->_frontController;
   }
   public function setFrontController(Zend_Controller_Front $controller )
   {
     $this ->_frontController = $controller ;
     return $this ;
   }
   public function setParam( $name , $value )
   {
     $name = (string) $name ;
     $this ->_invokeParams[ $name ] = $value ;
     return $this ;
   }
   public function setParams( array $params )
   {
     $this ->_invokeParams = array_merge ( $this ->_invokeParams, $params );
     return $this ;
   }
   public function getParam( $name )
   {
     if (isset( $this ->_invokeParams[ $name ])) {
       return $this ->_invokeParams[ $name ];
     }
     return null;
   }
   public function getParams()
   {
     return $this ->_invokeParams;
   }
   public function clearParams( $name = null)
   {
     if (null === $name ) {
       $this ->_invokeParams = array ();
     } elseif ( is_string ( $name ) && isset( $this ->_invokeParams[ $name ])) {
       unset( $this ->_invokeParams[ $name ]);
     } elseif ( is_array ( $name )) {
       foreach ( $name as $key ) {
         if ( is_string ( $key ) && isset( $this ->_invokeParams[ $key ])) {
           unset( $this ->_invokeParams[ $key ]);
         }
       }
     }
     return $this ;
   }
   public function setResponse(Zend_Controller_Response_Abstract $response = null)
   {
     $this ->_response = $response ;
     return $this ;
   }
   public function getResponse()
   {
     return $this ->_response;
   }
   public function setDefaultControllerName( $controller )
   {
     $this ->_defaultController = (string) $controller ;
     return $this ;
   }
   public function getDefaultControllerName()
   {
     return $this ->_defaultController;
   }
   public function setDefaultAction( $action )
   {
     $this ->_defaultAction = (string) $action ;
     return $this ;
   }
   public function getDefaultAction()
   {
     return $this ->_defaultAction;
   }
   public function setDefaultModule( $module )
   {
     $this ->_defaultModule = (string) $module ;
     return $this ;
   }
   public function getDefaultModule()
   {
     return $this ->_defaultModule;
   }
}

Zend_Controller_Dispatcher_Standard 。

ZendFramework继承抽象类Zend_Controller_Dispatcher_Abstract，定义了Zend_Controller_Dispatcher_Standard。Zend_Controller_Dispatcher_Standard是ZendFramework提供的基本的分发器，完成了分发功能.

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<?php
/** Zend_Loader */
require_once 'Zend/Loader.php' ;
/** Zend_Controller_Dispatcher_Abstract */
require_once 'Zend/Controller/Dispatcher/Abstract.php' ;
class Zend_Controller_Dispatcher_Standard extends Zend_Controller_Dispatcher_Abstract
{
   protected $_curDirectory ;
   protected $_curModule ;
   protected $_controllerDirectory = array ();
   public function __construct( array $params = array ())
   {
     parent::__construct( $params );
     $this ->_curModule = $this ->getDefaultModule();
   }
   public function addControllerDirectory( $path , $module = null)
   {
     if (null === $module ) {
       $module = $this ->_defaultModule;
     }
     $module = (string) $module ;
     $path  = rtrim((string) $path , '/\\' );
     $this ->_controllerDirectory[ $module ] = $path ;
     return $this ;
   }
   public function setControllerDirectory( $directory , $module = null)
   {
     $this ->_controllerDirectory = array ();
     if ( is_string ( $directory )) {
       $this ->addControllerDirectory( $directory , $module );
     } elseif ( is_array ( $directory )) {
       foreach (( array ) $directory as $module => $path ) {
         $this ->addControllerDirectory( $path , $module );
       }
     } else {
       require_once 'Zend/Controller/Exception.php' ;
       throw new Zend_Controller_Exception( 'Controller directory spec must be either a string or an array' );
     }
     return $this ;
   }
   public function getControllerDirectory( $module = null)
   {
     if (null === $module ) {
       return $this ->_controllerDirectory;
     }
     $module = (string) $module ;
     if ( array_key_exists ( $module , $this ->_controllerDirectory)) {
       return $this ->_controllerDirectory[ $module ];
     }
     return null;
   }
   public function removeControllerDirectory( $module )
   {
     $module = (string) $module ;
     if ( array_key_exists ( $module , $this ->_controllerDirectory)) {
       unset( $this ->_controllerDirectory[ $module ]);
       return true;
     }
     return false;
   }
   public function formatModuleName( $unformatted )
   {
     if (( $this ->_defaultModule == $unformatted ) && ! $this ->getParam( 'prefixDefaultModule' )) {
       return $unformatted ;
     }
     return ucfirst( $this ->_formatName( $unformatted ));
   }
   public function formatClassName( $moduleName , $className )
   {
     return $this ->formatModuleName( $moduleName ) . '_' . $className ;
   }
   public function classToFilename( $class )
   {
     return str_replace ( '_' , DIRECTORY_SEPARATOR, $class ) . '.php' ;
   }
   public function isDispatchable(Zend_Controller_Request_Abstract $request )
   {
     $className = $this ->getControllerClass( $request );
     if (! $className ) {
       return false;
     }
     $finalClass = $className ;
     if (( $this ->_defaultModule != $this ->_curModule)
       || $this ->getParam( 'prefixDefaultModule' ))
     {
       $finalClass = $this ->formatClassName( $this ->_curModule, $className );
     }
     if ( class_exists ( $finalClass , false)) {
       return true;
     }
     $fileSpec  = $this ->classToFilename( $className );
     $dispatchDir = $this ->getDispatchDirectory();
     $test    = $dispatchDir . DIRECTORY_SEPARATOR . $fileSpec ;
     return Zend_Loader::isReadable( $test );
   }
   public function dispatch(Zend_Controller_Request_Abstract $request , Zend_Controller_Response_Abstract $response )
   {
     $this ->setResponse( $response );
     /**
      * Get controller class
      */
     if (! $this ->isDispatchable( $request )) {
       $controller = $request ->getControllerName();
       if (! $this ->getParam( 'useDefaultControllerAlways' ) && ! empty ( $controller )) {
         require_once 'Zend/Controller/Dispatcher/Exception.php' ;
         throw new Zend_Controller_Dispatcher_Exception( 'Invalid controller specified (' . $request ->getControllerName() . ')' );
       }
       $className = $this ->getDefaultControllerClass( $request );
     } else {
       $className = $this ->getControllerClass( $request );
       if (! $className ) {
         $className = $this ->getDefaultControllerClass( $request );
       }
     }
     /**
      * Load the controller class file
      */
     $className = $this ->loadClass( $className );
     /**
      * Instantiate controller with request, response, and invocation
      * arguments; throw exception if it's not an action controller
      */
     $controller = new $className ( $request , $this ->getResponse(), $this ->getParams());
     if (!( $controller instanceof Zend_Controller_Action_Interface) &&
       !( $controller instanceof Zend_Controller_Action)) {
       require_once 'Zend/Controller/Dispatcher/Exception.php' ;
       throw new Zend_Controller_Dispatcher_Exception(
         'Controller "' . $className . '" is not an instance of Zend_Controller_Action_Interface'
       );
     }
     /**
      * Retrieve the action name
      */
     $action = $this ->getActionMethod( $request );
     /**
      * Dispatch the method call
      */
     $request ->setDispatched(true);
     // by default, buffer output
     $disableOb = $this ->getParam( 'disableOutputBuffering' );
     $obLevel  = ob_get_level();
     if ( empty ( $disableOb )) {
       ob_start();
     }
     try {
       $controller ->dispatch( $action );
     } catch (Exception $e ) {
       // Clean output buffer on error
       $curObLevel = ob_get_level();
       if ( $curObLevel > $obLevel ) {
         do {
           ob_get_clean();
           $curObLevel = ob_get_level();
         } while ( $curObLevel > $obLevel );
       }
       throw $e ;
     }
     if ( empty ( $disableOb )) {
       $content = ob_get_clean();
       $response ->appendBody( $content );
     }
     // Destroy the page controller instance and reflection objects
     $controller = null;
   }
   public function loadClass( $className )
   {
     $finalClass = $className ;
     if (( $this ->_defaultModule != $this ->_curModule)
       || $this ->getParam( 'prefixDefaultModule' ))
     {
       $finalClass = $this ->formatClassName( $this ->_curModule, $className );
     }
     if ( class_exists ( $finalClass , false)) {
       return $finalClass ;
     }
     $dispatchDir = $this ->getDispatchDirectory();
     $loadFile  = $dispatchDir . DIRECTORY_SEPARATOR . $this ->classToFilename( $className );
     if (Zend_Loader::isReadable( $loadFile )) {
       include_once $loadFile ;
     } else {
       require_once 'Zend/Controller/Dispatcher/Exception.php' ;
       throw new Zend_Controller_Dispatcher_Exception( 'Cannot load controller class "' . $className . '" from file "' . $loadFile . "'");
     }
     if (! class_exists ( $finalClass , false)) {
       require_once 'Zend/Controller/Dispatcher/Exception.php' ;
       throw new Zend_Controller_Dispatcher_Exception( 'Invalid controller class ("' . $finalClass . '")' );
     }
     return $finalClass ;
   }
   public function getControllerClass(Zend_Controller_Request_Abstract $request )
   {
     $controllerName = $request ->getControllerName();
     if ( empty ( $controllerName )) {
       if (! $this ->getParam( 'useDefaultControllerAlways' )) {
         return false;
       }
       $controllerName = $this ->getDefaultControllerName();
       $request ->setControllerName( $controllerName );
     }
     $className = $this ->formatControllerName( $controllerName );
     $controllerDirs   = $this ->getControllerDirectory();
     $module = $request ->getModuleName();
     if ( $this ->isValidModule( $module )) {
       $this ->_curModule  = $module ;
       $this ->_curDirectory = $controllerDirs [ $module ];
     } elseif ( $this ->isValidModule( $this ->_defaultModule)) {
       $request ->setModuleName( $this ->_defaultModule);
       $this ->_curModule  = $this ->_defaultModule;
       $this ->_curDirectory = $controllerDirs [ $this ->_defaultModule];
     } else {
       require_once 'Zend/Controller/Exception.php' ;
       throw new Zend_Controller_Exception( 'No default module defined for this application' );
     }
     return $className ;
   }
   public function isValidModule( $module )
   {
     if (! is_string ( $module )) {
       return false;
     }
     $module    = strtolower ( $module );
     $controllerDir = $this ->getControllerDirectory();
     foreach ( array_keys ( $controllerDir ) as $moduleName ) {
       if ( $module == strtolower ( $moduleName )) {
         return true;
       }
     }
     return false;
   }
   public function getDefaultControllerClass(Zend_Controller_Request_Abstract $request )
   {
     $controller = $this ->getDefaultControllerName();
     $default  = $this ->formatControllerName( $controller );
     $request ->setControllerName( $controller )
         ->setActionName(null);
     $module       = $request ->getModuleName();
     $controllerDirs   = $this ->getControllerDirectory();
     $this ->_curModule  = $this ->_defaultModule;
     $this ->_curDirectory = $controllerDirs [ $this ->_defaultModule];
     if ( $this ->isValidModule( $module )) {
       $found = false;
       if ( class_exists ( $default , false)) {
         $found = true;
       } else {
         $moduleDir = $controllerDirs [ $module ];
         $fileSpec = $moduleDir . DIRECTORY_SEPARATOR . $this ->classToFilename( $default );
         if (Zend_Loader::isReadable( $fileSpec )) {
           $found = true;
           $this ->_curDirectory = $moduleDir ;
         }
       }
       if ( $found ) {
         $request ->setModuleName( $module );
         $this ->_curModule  = $this ->formatModuleName( $module );
       }
     } else {
       $request ->setModuleName( $this ->_defaultModule);
     }
     return $default ;
   }
   public function getDispatchDirectory()
   {
     return $this ->_curDirectory;
   }
   public function getActionMethod(Zend_Controller_Request_Abstract $request )
   {
     $action = $request ->getActionName();
     if ( empty ( $action )) {
       $action = $this ->getDefaultAction();
       $request ->setActionName( $action );
     }
     return $this ->formatActionName( $action );
   }
}

前端控制器和分发器 。

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<?php
/** Zend_Loader */
require_once 'Zend/Loader.php' ;
/** Zend_Controller_Action_HelperBroker */
require_once 'Zend/Controller/Action/HelperBroker.php' ;
/** Zend_Controller_Plugin_Broker */
require_once 'Zend/Controller/Plugin/Broker.php' ;
class Zend_Controller_Front
{
   protected $_baseUrl = null;
   protected $_controllerDir = null;
   protected $_dispatcher = null;
   protected static $_instance = null;
   protected $_invokeParams = array ();
   protected $_moduleControllerDirectoryName = 'controllers' ;
   protected $_plugins = null;
   protected $_request = null;
   protected $_response = null;
   protected $_returnResponse = false;
   protected $_router = null;
   protected $_throwExceptions = false;
   protected function __construct()
   {
     $this ->_plugins = new Zend_Controller_Plugin_Broker();
   }
   private function __clone()
   {
   }
   public static function getInstance()
   {
     if (null === self:: $_instance ) {
       self:: $_instance = new self();
     }
     return self:: $_instance ;
   }
   public function resetInstance()
   {
     $reflection = new ReflectionObject( $this );
     foreach ( $reflection ->getProperties() as $property ) {
       $name = $property ->getName();
       switch ( $name ) {
         case '_instance' :
           break ;
         case '_controllerDir' :
         case '_invokeParams' :
           $this ->{ $name } = array ();
           break ;
         case '_plugins' :
           $this ->{ $name } = new Zend_Controller_Plugin_Broker();
           break ;
         case '_throwExceptions' :
         case '_returnResponse' :
           $this ->{ $name } = false;
           break ;
         case '_moduleControllerDirectoryName' :
           $this ->{ $name } = 'controllers' ;
           break ;
         default :
           $this ->{ $name } = null;
           break ;
       }
     }
     Zend_Controller_Action_HelperBroker::resetHelpers();
   }
   public static function run( $controllerDirectory )
   {
     self::getInstance()
       ->setControllerDirectory( $controllerDirectory )
       ->dispatch();
   }
   public function addControllerDirectory( $directory , $module = null)
   {
     $this ->getDispatcher()->addControllerDirectory( $directory , $module );
     return $this ;
   }
   public function setControllerDirectory( $directory , $module = null)
   {
     $this ->getDispatcher()->setControllerDirectory( $directory , $module );
     return $this ;
   }
   public function getControllerDirectory( $name = null)
   {
     return $this ->getDispatcher()->getControllerDirectory( $name );
   }
   public function removeControllerDirectory( $module )
   {
     return $this ->getDispatcher()->removeControllerDirectory( $module );
   }
   public function addModuleDirectory( $path )
   {
     try {
       $dir = new DirectoryIterator( $path );
     } catch (Exception $e ) {
       require_once 'Zend/Controller/Exception.php' ;
       throw new Zend_Controller_Exception( "Directory $path not readable" , 0, $e );
     }
     foreach ( $dir as $file ) {
       if ( $file ->isDot() || ! $file ->isDir()) {
         continue ;
       }
       $module  = $file ->getFilename();
       // Don't use SCCS directories as modules
       if (preg_match( '/^[^a-z]/i' , $module ) || ( 'CVS' == $module )) {
         continue ;
       }
       $moduleDir = $file ->getPathname() . DIRECTORY_SEPARATOR . $this ->getModuleControllerDirectoryName();
       $this ->addControllerDirectory( $moduleDir , $module );
     }
     return $this ;
   }
   public function getModuleDirectory( $module = null)
   {
     if (null === $module ) {
       $request = $this ->getRequest();
       if (null !== $request ) {
         $module = $this ->getRequest()->getModuleName();
       }
       if ( empty ( $module )) {
         $module = $this ->getDispatcher()->getDefaultModule();
       }
     }
     $controllerDir = $this ->getControllerDirectory( $module );
     if ((null === $controllerDir ) || ! is_string ( $controllerDir )) {
       return null;
     }
     return dirname( $controllerDir );
   }
   public function setModuleControllerDirectoryName( $name = 'controllers' )
   {
     $this ->_moduleControllerDirectoryName = (string) $name ;
     return $this ;
   }
   public function getModuleControllerDirectoryName()
   {
     return $this ->_moduleControllerDirectoryName;
   }
   public function setDefaultControllerName( $controller )
   {
     $dispatcher = $this ->getDispatcher();
     $dispatcher ->setDefaultControllerName( $controller );
     return $this ;
   }
   public function getDefaultControllerName()
   {
     return $this ->getDispatcher()->getDefaultControllerName();
   }
   public function setDefaultAction( $action )
   {
     $dispatcher = $this ->getDispatcher();
     $dispatcher ->setDefaultAction( $action );
     return $this ;
   }
   public function getDefaultAction()
   {
     return $this ->getDispatcher()->getDefaultAction();
   }
   public function setDefaultModule( $module )
   {
     $dispatcher = $this ->getDispatcher();
     $dispatcher ->setDefaultModule( $module );
     return $this ;
   }
   public function getDefaultModule()
   {
     return $this ->getDispatcher()->getDefaultModule();
   }
   public function setRequest( $request )
   {
     ...........................
     return $this ;
   }
   public function getRequest()
   {
     return $this ->_request;
   }
   public function setRouter( $router )
   {
     ....................
     return $this ;
   }
   public function getRouter()
   {
     ..................
     return $this ->_router;
   }
   public function setBaseUrl( $base = null)
   {
     ..............
     return $this ;
   }
   public function getBaseUrl()
   {
     return $this ->_baseUrl;
   }
   /**
    * Set the dispatcher object. The dispatcher is responsible for
    * taking a Zend_Controller_Dispatcher_Token object, instantiating the controller, and
    * call the action method of the controller.
    *
    * @param Zend_Controller_Dispatcher_Interface $dispatcher
    * @return Zend_Controller_Front
    */
   public function setDispatcher(Zend_Controller_Dispatcher_Interface $dispatcher )
   {
     $this ->_dispatcher = $dispatcher ;
     return $this ;
   }
   /**
    * Return the dispatcher object.
    *
    * @return Zend_Controller_Dispatcher_Interface
    */
   public function getDispatcher()
   {
     /**
      * Instantiate the default dispatcher if one was not set.
      */
     if (! $this ->_dispatcher instanceof Zend_Controller_Dispatcher_Interface) {
       require_once 'Zend/Controller/Dispatcher/Standard.php' ;
       $this ->_dispatcher = new Zend_Controller_Dispatcher_Standard();
     }
     return $this ->_dispatcher;
   }
   public function setResponse( $response )
   {..................
     return $this ;
   }
   public function getResponse()
   {
     return $this ->_response;
   }
   public function setParam( $name , $value )
   {
     $name = (string) $name ;
     $this ->_invokeParams[ $name ] = $value ;
     return $this ;
   }
   public function setParams( array $params )
   {
     $this ->_invokeParams = array_merge ( $this ->_invokeParams, $params );
     return $this ;
   }
   public function getParam( $name )
   {
     if (isset( $this ->_invokeParams[ $name ])) {
       return $this ->_invokeParams[ $name ];
     }
     return null;
   }
   public function getParams()
   {
     return $this ->_invokeParams;
   }
   public function clearParams( $name = null)
   {
     if (null === $name ) {
       $this ->_invokeParams = array ();
     } elseif ( is_string ( $name ) && isset( $this ->_invokeParams[ $name ])) {
       unset( $this ->_invokeParams[ $name ]);
     } elseif ( is_array ( $name )) {
       foreach ( $name as $key ) {
         if ( is_string ( $key ) && isset( $this ->_invokeParams[ $key ])) {
           unset( $this ->_invokeParams[ $key ]);
         }
       }
     }
     return $this ;
   }
   public function registerPlugin(Zend_Controller_Plugin_Abstract $plugin , $stackIndex = null)
   {
     $this ->_plugins->registerPlugin( $plugin , $stackIndex );
     return $this ;
   }
   public function unregisterPlugin( $plugin )
   {
     $this ->_plugins->unregisterPlugin( $plugin );
     return $this ;
   }
   public function hasPlugin( $class )
   {
     return $this ->_plugins->hasPlugin( $class );
   }
   public function getPlugin( $class )
   {
     return $this ->_plugins->getPlugin( $class );
   }
   public function getPlugins()
   {
     return $this ->_plugins->getPlugins();
   }
   public function throwExceptions( $flag = null)
   {
     .....................
     return $this ->_throwExceptions;
   }
   public function returnResponse( $flag = null)
   {
     ................
     return $this ->_returnResponse;
   }
   /**
    * Dispatch an HTTP request to a controller/action.
    *
    * @param Zend_Controller_Request_Abstract|null $request
    * @param Zend_Controller_Response_Abstract|null $response
    * @return void|Zend_Controller_Response_Abstract Returns response object if returnResponse() is true
    */
   public function dispatch(Zend_Controller_Request_Abstract $request = null, Zend_Controller_Response_Abstract $response = null)
   {
     if (! $this ->getParam( 'noErrorHandler' ) && ! $this ->_plugins->hasPlugin( 'Zend_Controller_Plugin_ErrorHandler' )) {
       // Register with stack index of 100
       require_once 'Zend/Controller/Plugin/ErrorHandler.php' ;
       $this ->_plugins->registerPlugin( new Zend_Controller_Plugin_ErrorHandler(), 100);
     }
     if (! $this ->getParam( 'noViewRenderer' ) && !Zend_Controller_Action_HelperBroker::hasHelper( 'viewRenderer' )) {
       require_once 'Zend/Controller/Action/Helper/ViewRenderer.php' ;
       Zend_Controller_Action_HelperBroker::getStack()->offsetSet(-80, new Zend_Controller_Action_Helper_ViewRenderer());
     }
     /**
      * Instantiate default request object (HTTP version) if none provided
      */
     if (null !== $request ) {
       $this ->setRequest( $request );
     } elseif ((null === $request ) && (null === ( $request = $this ->getRequest()))) {
       require_once 'Zend/Controller/Request/Http.php' ;
       $request = new Zend_Controller_Request_Http();
       $this ->setRequest( $request );
     }
     /**
      * Set base URL of request object, if available
      */
     if ( is_callable ( array ( $this ->_request, 'setBaseUrl' ))) {
       if (null !== $this ->_baseUrl) {
         $this ->_request->setBaseUrl( $this ->_baseUrl);
       }
     }
     /**
      * Instantiate default response object (HTTP version) if none provided
      */
     if (null !== $response ) {
       $this ->setResponse( $response );
     } elseif ((null === $this ->_response) && (null === ( $this ->_response = $this ->getResponse()))) {
       require_once 'Zend/Controller/Response/Http.php' ;
       $response = new Zend_Controller_Response_Http();
       $this ->setResponse( $response );
     }
     /**
      * Register request and response objects with plugin broker
      */
     $this ->_plugins
        ->setRequest( $this ->_request)
        ->setResponse( $this ->_response);
     /**
      * Initialize router
      */
     $router = $this ->getRouter();
     $router ->setParams( $this ->getParams());
     /**
      * Initialize dispatcher
      */
     $dispatcher = $this ->getDispatcher();
     $dispatcher ->setParams( $this ->getParams())
           ->setResponse( $this ->_response);
     // Begin dispatch
     try {
       /**
        * Route request to controller/action, if a router is provided
        */
       /**
       * Notify plugins of router startup
       */
       $this ->_plugins->routeStartup( $this ->_request);
       try {
         $router ->route( $this ->_request);
       } catch (Exception $e ) {
         if ( $this ->throwExceptions()) {
           throw $e ;
         }
         $this ->_response->setException( $e );
       }
       /**
       * Notify plugins of router completion
       */
       $this ->_plugins->routeShutdown( $this ->_request);
       /**
        * Notify plugins of dispatch loop startup
        */
       $this ->_plugins->dispatchLoopStartup( $this ->_request);
       /**
        * Attempt to dispatch the controller/action. If the $this->_request
        * indicates that it needs to be dispatched, move to the next
        * action in the request.
        */
       do {
         $this ->_request->setDispatched(true);
         /**
          * Notify plugins of dispatch startup
          */
         $this ->_plugins->preDispatch( $this ->_request);
         /**
          * Skip requested action if preDispatch() has reset it
          */
         if (! $this ->_request->isDispatched()) {
           continue ;
         }
         /**
          * Dispatch request
          */
         try {
           $dispatcher ->dispatch( $this ->_request, $this ->_response);
         } catch (Exception $e ) {
           if ( $this ->throwExceptions()) {
             throw $e ;
           }
           $this ->_response->setException( $e );
         }
         /**
          * Notify plugins of dispatch completion
          */
         $this ->_plugins->postDispatch( $this ->_request);
       } while (! $this ->_request->isDispatched());
     } catch (Exception $e ) {
       if ( $this ->throwExceptions()) {
         throw $e ;
       }
       $this ->_response->setException( $e );
     }
     /**
      * Notify plugins of dispatch loop completion
      */
     try {
       $this ->_plugins->dispatchLoopShutdown();
     } catch (Exception $e ) {
       if ( $this ->throwExceptions()) {
         throw $e ;
       }
       $this ->_response->setException( $e );
     }
     if ( $this ->returnResponse()) {
       return $this ->_response;
     }
     $this ->_response->sendResponse();
   }
}

以上对Zend_Controller_Front和Zend_Controller_Dispatcher做了简单的标记，通过分析代码不难看出，基本的运行机制.

分发发生在前端控制器中的一个循环（loop）中。分发之前，前端控制器通过路由请求，找到用户指定的模块、控制器、动作和可选参数。然后进入分发循环，分发请求.

分发器需要大量数据完成任务——它需要知道如何格式化控制器和动作的名称，到哪儿找到控制器类文件，模块名是否有效，以及基于其它可用信息判定请求是否能分发的API.

每次迭代（iteration）过程开始时，在请求对象中设置一个标志指示该动作已分发。如果在动作或者前/后分发（pre/postDispatch）插件重置了该标志，分发循环将继续下去并试图分发新的请求。通过改变请求中的控制器或者动作并重置已分发标志，开发人员可以定制执行一个请求链.

控制这种分发过程的动作控制器方法是_forward()；在任意的pre/postDispatch()或者动作中调用该方法，并传入动作、控制器、模块、以及可选的附加参数，就可以进入新的动作.

自定义分发器 。

Zend_Controller_Dispatcher_Interface定义了下列所有分发器需要实现的方法.

不过大多数情况下，只需要简单地扩展抽象类Zend_Controller_Dispatcher_Abstract，其中已经定义好了上面的大部分方法。或者扩展Zend_Controller_Dispatcher_Standard类，基于标准分发器来修改功能.

需要子类化分发器的可能原因包括：期望在动作控制器中使用不同的类和方法命名模式，或者期望使用不同的分发方式，比如分发到控制器目录下的动作文件，而不是控制器类的动作方法.

希望本文所述对大家PHP程序设计有所帮助.

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