Yii 提供了 CUploadedFile 来上传文件，比如图片，或者文档。
官方关于这个类的介绍 ：
http://www.yiichina.com/api/CUploadedFile
CUploadedFile
| 包 | system.web |
|---|---|
| 继承 | class CUploadedFile » CComponent |
| 源自 | 1.0 |
| 版本 | $Id: CUploadedFile.php 3515 2011-12-28 12:29:24Z mdomba $ |
| 源码 | framework/web/CUploadedFile.php |
CUploadedFile represents the information for an uploaded file.
Call getInstance to retrieve the instance of an uploaded file, and then use saveAs to save it on the server. You may also query other information about the file, including name, tempName, type, size and error.
公共属性
| 属性 | 类型 | 描述 | 定义在 |
|---|---|---|---|
| error | integer | Returns an error code describing the status of this file uploading. | CUploadedFile |
| extensionName | string | the file extension name for name. | CUploadedFile |
| hasError | boolean | whether there is an error with the uploaded file. | CUploadedFile |
| name | string | the original name of the file being uploaded | CUploadedFile |
| size | integer | the actual size of the uploaded file in bytes | CUploadedFile |
| tempName | string | the path of the uploaded file on the server. | CUploadedFile |
| type | string | the MIME-type of the uploaded file (such as "image/gif"). | CUploadedFile |
方法一：
实现上传文件，要用到MVC三个层面。
1、 模型层面 M （User.php），把一个字段在rules方法里设置为 file 属性。
array('url',
'file', //定义为file类型
'allowEmpty'=>false,
'types'=>'jpg,png,gif,doc,docx,pdf,xls,xlsx,zip,rar,ppt,pptx', //上传文件的类型
'maxSize'=>1024*1024*10, //上传大小限制，注意不是php.ini中的上传文件大小
'tooLarge'=>'文件大于10M，上传失败！请上传小于10M的文件！'
),
//array('imgpath','file','types'=>'jpg,gif,png','on'=>'insert'),
array('addtime', 'length', 'max'=>10),
2、视图层View（upimg.php），这里需要用到CHtml::activeFileField 来生成选择文件的button，注意是上传文件，所以在该标单中enctype应该设置为： multupart/form-data
详见：http://www.yiichina.com/api/CHtml#activeFileField-detail
<?php $form=$this->beginWidget('CActiveForm', array(
'id'=>'link-form',
'enableAjaxValidation'=>false,
/**
* activeFileField()方法为一个模型属性生成一个文件输入框。
* 注意，你必须设置表单的‘enctype’属性为‘multipart/form-data’。
* 表单被提交后，上传的文件信息可以通过$_FILES[$name]来获得 (请参阅 PHP documentation).
*/
'htmlOptions' => array('enctype'=>'multipart/form-data'),
)); ?>
<div class="row">
<?php echo $form->labelEx($model,'url'); ?>
<?php if($model->url){ echo '<img src="/'.$model->url.'" width="20%"/>';} ?>
<?php echo CHtml::activeFileField($model,'url'); ?>
<?php echo $form->error($model,'url'); ?>
</div>
<div class="row buttons">
<?php echo CHtml::submitButton('上传'); ?>
</div>
<?php $this->endWidget(); ?>
3、控制层 C（UserController.php）
//图片上传测试页面
public function actionUpimg()
{
$model = new User; // Uncomment the following line if AJAX validation is needed
// $this->performAjaxValidation($model); if (isset($_POST['User'])) {
$model->attributes = $_POST['User'];
$file = CUploadedFile::getInstance($model, 'url'); //获得一个CUploadedFile的实例
//if (is_object($file) && get_class($file) === 'CUploadedFile') { // 判断实例化是否成功
if ($file) { // 判断实例化是否成功
$newimg = 'url_' . time() . '_' . rand(1, 9999) . '.' . $file->extensionName;
//根据时间戳和随机数重命名文件名，extensionName是获取文件的扩展名
$file->saveAs('assets/uploads/user/' . $newimg); // 上传图片
$model->url = 'assets/uploads/user/' . $newimg;
}
$model->addtime = time(); if ($model->save()){
$this->redirect(array('view', 'id' => $model->id));
}
} $this->render('upimg', array('model' => $model, ));
}
方法二：
在protected\components下新建UploadImg.php文件：
<?php
/**
* 图片上传类，也可上传其它类型的文件
*
* @author
*/
class UploadImg
{
public static function createFile($upload, $type, $act, $imgurl = '')
{
//更新图片
if (!empty($imgurl) && $act === 'update') {
$deleteFile = Yii::app()->basePath . '/../' . $imgurl;
if (is_file($deleteFile))
unlink($deleteFile);
} //上传图片
$uploadDir = Yii::app()->basePath . '/../uploads/' . $type . '/' . date('Y-m', time());
self::recursionMkDir($uploadDir);
//根据时间戳和随机数重命名文件名，extensionName是获取文件的扩展名
$imgname = time() . '-' . rand() . '.' . $upload->extensionName;
//图片存储路径
$imageurl = '/uploads/' . $type . '/' . date('Y-m', time()) . '/' . $imgname;
//存储绝对路径
$uploadPath = $uploadDir . '/' . $imgname;
if ($upload->saveAs($uploadPath)) {
return $imageurl;
} else {
return false;
}
} //创建目录
private static function recursionMkDir($dir)
{
if (!is_dir($dir)) {
if (!is_dir(dirname($dir))) {
self::recursionMkDir(dirname($dir));
mkdir($dir, '0777');
} else {
mkdir($dir, '0777');
}
}
}
}
控制层 C（UserController.php）改为：
//图片上传测试页面
public function actionUpimg()
{
$model = new User; if (isset($_POST['User'])) {
$model->attributes = $_POST['User'];
$upload = CUploadedFile::getInstance($model, 'url'); //获得一个CUploadedFile的实例
if ($upload) { // 判断实例化是否成功
$model->url = UploadImg::createFile($upload, 'User', 'upimg');
} $model->addtime = time(); if ($model->save()) {
$this->redirect(array('view', 'id' => $model->id));
}
}
$this->render('upimg', array('model' => $model, ));
}
参考页面：
http://blog.csdn.net/littlebearwmx/article/details/8573102
http://wuhai.blog.51cto.com/blog/2023916/953300
http://blog.sina.com.cn/s/blog_7522019b01014zno.html