本文实例讲述了Yii框架实现的验证码、登录及退出功能。分享给大家供大家参考，具体如下：

捣鼓了一下午，总算走通了，下面贴出代码。

Model

<?phpclass Auth extends CActiveRecord { public static function model($className = __CLASS__) { return parent::model($className); } public function tableName() { return '{{auth}}'; }}

注：我的用户表是auth，所以模型是Auth.php

<?phpclass IndexForm extends CFormModel { public $a_account; public $a_password; public $rememberMe; public $verifyCode; public $_identity; public function rules() { return array( array('verifyCode', 'captcha', 'allowEmpty' => !CCaptcha::checkRequirements(), 'message'=>'请输入正确的验证码'), array('a_account', 'required', 'message' => '用户名必填'), array('a_password', 'required', 'message' => '密码必填'), array('a_password', 'authenticate'), array('rememberMe', 'boolean'), ); } public function authenticate($attribute, $params) { if (!$this->hasErrors()) { $this->_identity = new UserIdentity($this->a_account, $this->a_password); if (!$this->_identity->authenticate()) { $this->addError('a_password', '用户名或密码不存在'); } } } public function login() { if ($this->_identity === null) { $this->_identity = new UserIdentity($this->a_account, $this->a_password); $this->_identity->authenticate(); } if ($this->_identity->errorCode === UserIdentity::ERROR_NONE) { $duration = $this->rememberMe ? 60*60*24*7 : 0; Yii::app()->user->login($this->_identity, $duration); return true; } else { return false; } } public function attributeLabels() { return array( 'a_account' => '用户名', 'a_password' => '密码', 'rememberMe' => '记住登录状态', 'verifyCode' => '验证码' ); }}

注：IndexForm也可以写成LoginForm，只是系统内已经有了，我就没有替换它，同时注意看自己用户表的字段，一般是password和username，而我的是a_account和a_password

Controller

<?phpclass IndexController extends Controller { public function actions() { return array( 'captcha' => array( 'class' => 'CCaptchaAction', 'width'=>100, 'height'=>50 ) ); } public function actionLogin() { if (Yii::app()->user->id) { echo "<div>欢迎" . Yii::app()->user->id . "，<a href='" . SITE_URL . "admin/index/logout'>退出</a></div>"; } else { $model = new IndexForm(); if (isset($_POST['IndexForm'])) { $model->attributes = $_POST['IndexForm']; if ($model->validate() && $model->login()) { echo "<div>欢迎" . Yii::app()->user->id . "，<a href='" . SITE_URL . "admin/index/logout'>退出</a></div>";exit; } } $this->render('login', array('model' => $model)); } } public function actionLogout() { Yii::app()->user->logout(); $this->redirect(SITE_URL . 'admin/index/login'); }}

注：第一个方法是添加验证码的

view

<meta http-equiv="content-type" content="text/html;charset=utf-8"><?php$form = $this->beginWidget('CActiveForm', array( 'id' => 'login-form', 'enableClientValidation' => true, 'clientOptions' => array( 'validateOnSubmit' => true )));?> <div class="row"> <?php echo $form->labelEx($model,'a_account'); ?> <?php echo $form->textField($model,'a_account'); ?> <?php echo $form->error($model,'a_account'); ?> </div> <div class="row"> <?php echo $form->labelEx($model,'a_password'); ?> <?php echo $form->passwordField($model,'a_password'); ?> <?php echo $form->error($model,'a_password'); ?> </div> <?php if(CCaptcha::checkRequirements()) { ?> <div class="row"> <?php echo $form->labelEx($model, 'verifyCode'); ?> <?php $this->widget('CCaptcha'); ?> <?php echo $form->textField($model, 'verifyCode'); ?> <?php echo $form->error($model, 'verifyCode'); ?> </div> <?php } ?> <div class="row rememberMe"> <?php echo $form->checkBox($model,'rememberMe'); ?> <?php echo $form->label($model,'rememberMe'); ?> <?php echo $form->error($model,'rememberMe'); ?> </div> <div class="row buttons"> <?php echo CHtml::submitButton('Submit'); ?> </div><?php $this->endWidget(); ?>

同时修改项目下protected/components下的UserIdentity.php

<?php/** * UserIdentity represents the data needed to identity a user. * It contains the authentication method that checks if the provided * data can identity the user. */class UserIdentity extends CUserIdentity{ /** * Authenticates a user. * The example implementation makes sure if the username and password * are both 'demo'. * In practical applications, this should be changed to authenticate * against some persistent user identity storage (e.g. database). * @return boolean whether authentication succeeds. */ public function authenticate() { $user_model = Auth::model()->find('a_account=:name',array(':name'=>$this->username)); if($user_model === null){ $this -> errorCode = self::ERROR_USERNAME_INVALID; return false; } else if ($user_model->a_password !== md5($this -> password)){ $this->errorCode=self::ERROR_PASSWORD_INVALID; return false; } else { $this->errorCode=self::ERROR_NONE; return true; } }}

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