'modules'=>array(
  'admin'=>array(//这行的admin为Module ID。与创建Module时填写的Module ID大写写一致
    'class'=>'application.modules.admin.AdminModule',//这里的admin在windows os中大小写无所谓，但最好与实际目录一致。
  ),
),

/**
 * Specifies the access control rules.
 * This method is used by the 'accessControl' filter.
 * @return array access control rules
 */
public function accessRules()
{
  return array(
    array('allow', // allow all users to perform 'index' and 'view' actions
      'actions'=>array('index','view'),//表示任意用户可访问index、view方法
      'users'=>array('*'),//表示任意用户
    ),
    array('allow', // allow authenticated user to perform 'create' and 'update' actions
      'actions'=>array('create','update'),//表示只有认证用户才可操作create、update方法
      'users'=>array('@'),//表示认证用户
    ),
    array('allow', // allow admin user to perform 'admin' and 'delete' actions
      'actions'=>array('admin','delete'),//表示只有用户admin才能访问admin、delete方法
      'users'=>array('admin'),//表示指定用户，这里指用户：admin
    ),
    array('deny', // deny all users
      'users'=>array('*'),
    ),
  );
}

public function beforeSave()
{
  if(parent::beforeSave())
  {
    if($this->isNewRecord)
    {
      $this->password=md5($this->password);
      $this->create_user_id=Yii::app()->user->id;//一开始这样写，User::model()->user->id;（错误）
      //$this->user->id;（错误）
      $this->create_time=date('Y-m-d H:i:s');
    }
    else
    {
      $this->update_user_id=Yii::app()->user->id;
      $this->update_time=date('Y-m-d H:i:s');
    }
    return true;
  }
  else
  {
    return false;
  }
}

<?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.
   */
  private $_id;
  public function authenticate()
  {
    $username=strtolower($this->username);
    $user=User::model()->find('LOWER(username)=?',array($username));
    if($user===null)
    {
      $this->errorCode=self::ERROR_USERNAME_INVALID;
    }
    else
    {
      //if(!User::model()->validatePassword($this->password))
      if(!$user->validatePassword($this->password))
      {
        $this->errorCode=self::ERROR_PASSWORD_INVALID;
      }
      else
      {
        $this->_id=$user->id;
        $this->username=$user->username;
        $this->errorCode=self::ERROR_NONE;
      }
    }
    return $this->errorCode===self::ERROR_NONE;
  }
  public function getId()
  {
    return $this->_id;
  }
}

public function beforeSave()
{
  if(parent::beforeSave())
  {
    if($this->isNewRecord)
    {
      $this->password=md5($this->password);
      $this->create_user_id=Yii::app()->user->id;//====主要为此句。得到登陆帐号的ID
      $this->create_time=date('Y-m-d H:i:s');
    }
    else
    {
      $this->update_user_id=Yii::app()->user->id;
      $this->update_time=date('Y-m-d H:i:s');
    }
    return true;
  }
  else
  {
    return false;
  }
}

/*
由于CComponent是post最顶级父类，所以添加getUrl方法。。。。如下说明：
CComponent 是所有组件类的基类。
CComponent 实现了定义、使用属性和事件的协议。
属性是通过getter方法或/和setter方法定义。访问属性就像访问普通的对象变量。读取或写入属性将调用应相的getter或setter方法
例如：
$a=$component->text;   // equivalent to $a=$component->getText();
$component->text='abc'; // equivalent to $component->setText('abc');
getter和setter方法的格式如下
// getter, defines a readable property 'text'
public function getText() { ... }
// setter, defines a writable property 'text' with $value to be set to the property
public function setText($value) { ... }
*/
public function getUrl()
{
  return Yii::app()->createUrl('post/view',array(
    'id'=>$this->id,
    'title'=>$this->title,
  ));
}

/*
 * rules方法：指定对模型属性的验证规则
 * 模型实例调用validate或save方法时逐一执行
 * 验证的必须是用户输入的属性。像id，作者id等通过代码或数据库设定的不用出现在rules中。
 */
/**
 * @return array validation rules for model attributes.
 */
public function rules()
{
  // NOTE: you should only define rules for those attributes that
  // will receive user inputs.
  return array(
  array('news_title, news_content', 'required'),
  array('news_title', 'length', 'max'=>128),
  array('news_content', 'length', 'max'=>8000),
  array('author_name, type_id, status_id,create_time, update_time, create_user_id, update_user_id', 'safe'),
  // The following rule is used by search().
  // Please remove those attributes that should not be searched.
  array('id, news_title, news_content, author_name, type_id, status_id, create_time, update_time, create_user_id, update_user_id', 'safe', 'on'=>'search'),
  );
}

/**
 * @return array validation rules for model attributes.
 */
public function rules()
{
  // NOTE: you should only define rules for those attributes that
  // will receive user inputs.
  return array(
    array('news_title, news_content', 'required'),
    array('news_title', 'length', 'max'=>128, 'encoding'=>'utf-8'),
    array('news_content', 'length', 'max'=>8000, 'encoding'=>'utf-8'),
    array('author_name', 'length', 'max'=>10, 'encoding'=>'utf-8'),
    array('status_id, type_id', 'safe'),
    // The following rule is used by search().
    // Please remove those attributes that should not be searched.
    array('id, news_title, news_content, author_name, type_id, status_id', 'safe', 'on'=>'search'),
  );
}