yii学习笔记--url解析

　　在通过yiic命令生成了一个app之后，我们通过浏览器访问会看到这样的一个页面。

 

　　点击home时，url为：http://localhost/blog/index.php?r=site/index

　　点击about时，url为：http://localhost/blog/index.php?r=site/page&view=about

　　但是，实际上他们都对应于不同的脚本。app在一个名叫 urlManager 的应用组件的帮助下，决定请求的控制和动作，以上的两个请求都对应于同一个控制器site，我们可以在/protected/controllers/ 目录下找到控制器：SiteController.php（如下），class SiteController 继承于 Controller，在SiteController里面会定义处理请求的动作方法，比如function actionIndex () {}；他用于处理url为：http://localhost/blog/index.php?r=site/index 这个请求。而对于url为：http://localhost/blog/index.php?r=site/page&view=about，我们并未找到 function actionPage () {}；而且我们可以看到与其他url不同的是，这个请求还附带了一个参数 view=about，其实这类请求都在function actions () {};中进行处理，对于这个请求，它会到/protected/views/site/pages 下面寻找 about.php页面。
    

 ?php

 class SiteController extends Controller
 {
         /**
          * Declares class-based actions.
          */
         public function actions()
         {
                 return array(
                         // captcha action renders the CAPTCHA image displayed on the contact page
                         'captcha'=>array(
                                 'class'=>'CCaptchaAction',
                                 'backColor'=>0xFFFFFF,
                         ),
                         // page action renders "static" pages stored under 'protected/views/site/pages'
                         // They can be accessed via: index.php?r=site/page&view=FileName
                         'page'=>array(
                                 'class'=>'CViewAction',
                         ),
                 );
         }

         /**
          * This is the default 'index' action that is invoked
          * when an action is not explicitly requested by users.
          */
         public function actionIndex()
         {
                 // renders the view file 'protected/views/site/index.php'
                 // using the default layout 'protected/views/layouts/main.php'
                 $this->render('index');
         }

         /**
          * This is the action to handle external exceptions.
          */
         public function actionError()
         {
                 if($error=Yii::app()->errorHandler->error)
                 {
                         if(Yii::app()->request->isAjaxRequest)
                                 echo $error['message'];
                         else
                                 $this->render('error', $error);
                 }
         }/**
          * Displays the contact page
          */
         public function actionContact()
         {
                 $model=new ContactForm;
                 if(isset($_POST['ContactForm']))
                 {
                         $model->attributes=$_POST['ContactForm'];
                         if($model->validate())
                         {
                                 $name='=?UTF-8?B?'.base64_encode($model->name).'?=';
                                 $subject='=?UTF-8?B?'.base64_encode($model->subject).'?=';
                                 $headers="From: $name <{$model->email}>\r\n".
                                         "Reply-To: {$model->email}\r\n".
                                         "MIME-Version: 1.0\r\n".
                                         "Content-type: text/plain; charset=UTF-8";

                                 mail(Yii::app()->params['adminEmail'],$subject,$model->body,$headers);
                                 Yii::app()->user->setFlash('contact','Thank you for contacting us. We will respond to you as soon as possible.');
                                 $this->refresh();
                         }
                 }
                 $this->render('contact',array('model'=>$model));
         }/**
          * Displays the login page
          */
         public function actionLogin()
         {
                 $model=new LoginForm;

                 // if it is ajax validation request
                 if(isset($_POST['ajax']) && $_POST['ajax']==='login-form')
                 {
                         echo CActiveForm::validate($model);
                         Yii::app()->end();
                 }

                 // collect user input data
                 if(isset($_POST['LoginForm']))
                 {
                         $model->attributes=$_POST['LoginForm'];
                         // validate user input and redirect to the previous page if valid
                         if($model->validate() && $model->login())
                                 $this->redirect(Yii::app()->user->returnUrl);
                 }
                 // display the login form
                 $this->render('login',array('model'=>$model));
         }

         /**
          * Logs out the current user and redirect to homepage.
          */
         public function actionLogout()
         {
                 Yii::app()->user->logout();
                 $this->redirect(Yii::app()->homeUrl);
         }
 }