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1、在配置文件main.php下的components里添加下面代码：

'user'=>array(
    // enable cookie-based authentication
    'allowAutoLogin'=>true,
),

2、在SiteController.php添加如下代码：

public function filters()
{
    return array(
        'accessControl', // perform access control for CRUD operations
    );
}
public function accessRules()
{
    return array(
        array('allow',  //未登录用户允许操作的action
                'actions'=>array('login','logout','register'),
                'users'=>array('*'),
        ),
        array('allow',   //登录用户允许操作全部action
                'users'=>array('@')
        ),
        array('deny',  // allow all users to perform 'index' and 'view' actions
                'users'=>array('*'),
        ),
   );
}

更新一下更完善的方法： 2、在SiteController.php添加如下代码：

public function accessRules()
{
    return array(
        array('allow',  // allow all users to perform 'index' and 'view' actions
            'actions'=>array('login','error'),
            'users'=>array('*'),
        ),
        array('allow', // allow admin user to perform 'admin' and 'delete' actions
            'actions'=>array('logout'),
            'users'=>array('@'),
        ),
        array('deny',  // deny all users
            'users'=>array('*'),
        ),
    );
}

3、在配置文件main.php下添加下面代码：

'defaultController'=>'options/welcome',//默认加载的控制器 页面

4、在OptionsController.php修改accessRules，修改后的代码如下：

public function accessRules()
{
    return array(
        array('allow', // allow admin user to perform 'admin' and 'delete' actions
            'actions'=>array('welcome'),
            'users'=>array('admin'),
        ),
        array('deny',  // deny all users
            'users'=>array('*'),
        ),
    );
}