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

<?php
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

<?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

<?php
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 "<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()
  {
    /*
    $users=array(
      // username => password
      "demo"=>"demo",
      "admin"=>"admin",
    );
    if(!isset($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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