【下载文档:  Yii框架实现的验证码、登录及退出功能示例.txt 】

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Yii框架实现的验证码、登录及退出功能示例
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
class 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
class 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
class 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 "";
} else {
$model = new IndexForm();
if (isset($_POST['IndexForm'])) {
$model->attributes = $_POST['IndexForm'];
if ($model->validate() && $model->login()) {
echo "";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

$form = $this->beginWidget('CActiveForm', array(
'id' => 'login-form',
'enableClientValidation' => true,
'clientOptions' => array(
'validateOnSubmit' => true
)
));
?>







endWidget(); ?>
同时修改项目下protected/components下的UserIdentity.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()
{
/*
$users=array(
// username => password
'demo'=>'demo',
'admin'=>'admin',
);
if(!isset($users[$this->username]))
$this->errorCode=self::ERROR_USERNAME_INVALID;
elseif($users[$this->username]!==$this->password)
$this->errorCode=self::ERROR_PASSWORD_INVALID;
else
$this->errorCode=self::ERROR_NONE;
return !$this->errorCode;
*/
$user_model = Auth::model()->find('a_account=:name',array(':name'=>$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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希望本文所述对大家基于Yii框架的PHP程序设计有所帮助。