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}>
".
                                        "Reply-To: {$model->email}
".
                                        "MIME-Version: 1.0
".
                                        "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);
        }
}