如何使用Zend Framework动作助手Url？

public function simple($action, $controller = null, $module = null, array $params = null)
public function url($urlOptions = array(), $name = null, $reset = false, $encode = true)
public function direct($action, $controller = null, $module = null, array $params = null)

<?php
class IndexController extends Zend_Controller_Action
{
 public function init()
 {
  /* Initialize action controller here */
 }
 public function indexAction()
 {
  //$urlParser = $this->_helper->getHelper('UrlParser');
  //var_dump($urlParser->parse('http://www.jb51.net/article/80479.htm'));
  $url = $this->_helper->getHelper('Url');
  $action = 'actionname';
  $controller = 'controllername';
  $module = 'modulename';
  $params = array('param1'=>'中文参数');
  var_dump($url->simple($action, $controller, $module, $params));
  $urlOptions = array(
    'action'=>$action,
    'controller'=>$controller,
    'module'=>$module,
    'params'=>$params);
  var_dump($url->url($urlOptions));
  var_dump($url->direct($action, $controller, $module, $params));
  exit;
 }
}

/**
 * @see Zend_Controller_Action_Helper_Abstract
 */
require_once 'Zend/Controller/Action/Helper/Abstract.php';
/**
 * Helper for creating URLs for redirects and other tasks
 *
 * @uses  Zend_Controller_Action_Helper_Abstract
 * @category Zend
 * @package Zend_Controller
 * @subpackage Zend_Controller_Action_Helper
 * @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd  New BSD License
 */
class Zend_Controller_Action_Helper_Url extends Zend_Controller_Action_Helper_Abstract
{
 /**
  * Create URL based on default route
  *
  * @param string $action
  * @param string $controller
  * @param string $module
  * @param array $params
  * @return string
  */
 public function simple($action, $controller = null, $module = null, array $params = null)
 {
  $request = $this->getRequest();
  if (null === $controller) {
   $controller = $request->getControllerName();
  }
  if (null === $module) {
   $module = $request->getModuleName();
  }
  $url = $controller . '/' . $action;
  if ($module != $this->getFrontController()->getDispatcher()->getDefaultModule()) {
   $url = $module . '/' . $url;
  }
  if ('' !== ($baseUrl = $this->getFrontController()->getBaseUrl())) {
   $url = $baseUrl . '/' . $url;
  }
  if (null !== $params) {
   $paramPairs = array();
   foreach ($params as $key => $value) {
    $paramPairs[] = urlencode($key) . '/' . urlencode($value);
   }
   $paramString = implode('/', $paramPairs);
   $url .= '/' . $paramString;
  }
  $url = '/' . ltrim($url, '/');
  return $url;
 }
 /**
  * Assembles a URL based on a given route
  *
  * This method will typically be used for more complex operations, as it
  * ties into the route objects registered with the router.
  *
  * @param array $urlOptions Options passed to the assemble method of the Route object.
  * @param mixed $name  The name of a Route to use. If null it will use the current Route
  * @param boolean $reset
  * @param boolean $encode
  * @return string Url for the link href attribute.
  */
 public function url($urlOptions = array(), $name = null, $reset = false, $encode = true)
 {
  $router = $this->getFrontController()->getRouter();
  return $router->assemble($urlOptions, $name, $reset, $encode);
 }
 /**
  * Perform helper when called as $this->_helper->url() from an action controller
  *
  * Proxies to {@link simple()}
  *
  * @param string $action
  * @param string $controller
  * @param string $module
  * @param array $params
  * @return string
  */
 public function direct($action, $controller = null, $module = null, array $params = null)
 {
  return $this->simple($action, $controller, $module, $params);
 }
}