yii2 使用Plupload实现多图上传（带缩放功能）

这是plupload的相关代码，实现了ajax多图同时上传，然后将图片进行缩放，最后显示图片。

1、文章视图中调用Plupload

<?= \common\widgets\Plupload::widget([    'model'=>$model,    'attribute'=>'cover_img',    'url'=>'/file/upload',//处理文件上传控制器])?>

2、\common\widgets\Plupload 组件

<?phpnamespace common\widgets;use backend\assets\UploadAsset;use yii;use yii\helpers\Html;use yii\base\Exception;class Plupload extends yii\bootstrap\Widget{    public $model;    public $attribute;    public $name;    public $url;    private $_html;    public function init(){        parent::init();        if(!$this->url){            throw new Exception('url参数不能为空');        }        if(!$this->model){            throw new Exception('model属性不能为空');        }        if(!$this->attribute){            throw new Exception('attribute属性不能为空');        }    }    public function run(){        $model = $this->model;        $attribute = $this->attribute;        $path = $model->$attribute?$model->$attribute:"/images/noimage.gif";//显示文章图片或者默认图片        $this->_html.='<div class="form-group field-article-author" id="container">';        $this->_html.=Html::activeLabel($model,$attribute);        $this->_html.=Html::activeHiddenInput($model,$attribute,['id'=>'hidden_input','value'=>$path]);        $this->_html .= '<div id="pickfiles" style="height:50px;min-width:50px;max-width: 300px;overflow: hidden;"><img height="50" src="'.$path.'" /></div>';        $this->_html.='</div>  ';        UploadAsset::register($this->view);        $this->view->registerJs(            '$(function(){                initCoverImageUploader("pickfiles","container","2mb","'.$this->url.'","'.Yii::$app->request->getCsrfToken().'");            });'        );        return $this->_html;    }}

3、backend\assets\UploadAsset

注册相关js

<?phpnamespace backend\assets;use yii\web\AssetBundle;class UploadAsset extends AssetBundle{    public $basePath = '@webroot';    public $baseUrl = '@web';    public $css = [    ];    public $js = [        'js/upload.js'    ];    public $depends = [        'backend\assets\PluploadAsset',    ];}

4、js/upload.js

ajax处理代码

function initCoverImageUploader(buttonId,contatinerId,maxFileSize,url,csrfToken){    var uploader = new plupload.Uploader({        runtimes : 'html5,flash,silverlight,html4',        browse_button :buttonId, // you can pass an id...        container: contatinerId, // ... or DOM Element itself        url : url,        flash_swf_url : '@vendor/moxiecode/plupload/js/Moxie.swf',        silverlight_xap_url : '@vendor/moxiecode/plupload//js/Moxie.xap',        filters : {            max_file_size : maxFileSize,            mime_types: [                {title : "Image files", extensions : "jpg,gif,png"},                {title : "Zip files", extensions : "zip"}            ]        },        multipart_params:{            '_csrf':csrfToken        },        init: {            FilesAdded: function(up, files) {                uploader.start();            },            UploadProgress: function(up, file) {                $('#'+contatinerId+' p').text('已上传:'+file.percent+'%');            },            FileUploaded:function (up, file, result) {                result =  $.parseJSON(result.response);                if(result.code == 0){                    $('#'+buttonId).html('<img src="'+result.path+'" height="50" />');                    $('#hidden_input').val(result.path);                    //console.log(result.message);                }            },            Error: function(up, err) {                document.getElementById('console').appendChild(document.createTextNode("\nError #" + err.code + ": " + err.message));            }        }    });    uploader.init();}

5、backend\assets\PluploadAsset

注册plupload相关资源

<?phpnamespace backend\assets;use yii\web\AssetBundle;class PluploadAsset extends AssetBundle{    public $sourcePath = '@vendor/moxiecode/plupload';    public $css = [    ];    public $js = [        'js/plupload.full.min.js',    ];    public $depends = [        'yii\web\JqueryAsset',    ];}

6、FileController

控制器调用模型处理上传文件，并且返回结果

class FileController extends BaseController{    public function actionUpload(){        Yii::$app->response->format=Response::FORMAT_JSON;        $model = New ImageUpload();        $model->fileInputName = 'file';        if($model->save()){            return ['code'=>0,'message'=>$model->getMessage(),'path'=>$model->getUrlPath()];        }else{            return ['code'=>1,'message'=>$model->getMessage()];        }    }}

7、common\models\ImageUpload

模型中对上传文件做了一定的检测，然后将源文件按照一定的比例进行缩放

<?phpnamespace common\models;use yii\base\Exception;use yii\helpers\FileHelper;use yii\web\UploadedFile;class ImageUpload extends \yii\base\Object{    public $fileInputName = 'file';//上传表单 file name    public $savePath ;//图像保存根位置    public $allowExt = ['jpg','png','jpeg','gif','bmp'];//允许上传后缀    public $maxFileSize=1024100000;//最大大小    public $allowType = ['image/jpeg','image/bmp','image/gif','image/png','image/pjpeg','image/bmp','image/gif','image/x-png','image/pjpeg','image/bmp', 'image/gif' ,'image/x-png','image/pjpeg','image/bmp','image/gif','image/x-png'];    private $_uploadFile;//上传文件    private $filePath;//文件路径    private $urlPath;//访问路径    private $res=false;//返回状态    private $message;//返回信息    public function getMessage(){        return $this->message;    }    public function getUrlPath(){        return $this->urlPath;    }    public function init(){        if(!$this->fileInputName) throw new Exception('fileInputName属性不能为空');        if(!$this->savePath) $this->savePath = \Yii::$app->basePath.'/web/uploads/images';        $this->savePath = rtrim($this->savePath,'/');        if(!file_exists($this->savePath)){            if(! FileHelper::createDirectory($this->savePath)){                $this->message = '没有权限创建'.$this->savePath;                return false;            }        }        $this->_uploadFile = UploadedFile::getInstanceByName($this->fileInputName);        if(!$this->_uploadFile){            $this->message = '没有找到上传文件';            return false;        }        if($this->_uploadFile->error){            $this->message = '上传失败';            return false;        }        if(!in_array($this->extension,$this->allowExt) || !in_array($this->type,$this->allowType)){            $this->message = '该文件类型不允许上传';            return false;        }        if($this->_uploadFile->size> $this->maxFileSize){            $this->message = '文件过大';            return false;        }        $path = date('Y-m',time());        if(!file_exists($this->savePath.'/'.$path)){            FileHelper::createDirectory($this->savePath.'/'.$path);        }        $name = substr(\Yii::$app->security->generateRandomString(),-4,4);        $this->filePath = $this->savePath.'/'.$path.'/'.$this->baseName.'--'.$name.'.'.$this->extension;        $this->urlPath = '/uploads/images/'.$path.'/'.$this->baseName.'--'.$name.'.'.$this->extension;    }    public function save(){        if($this->_uploadFile->saveAs($this->filePath)){            $this->CreateThumbnail($this->filePath);//缩放图片            $this->res = true;        }else{            $this->res = false;        }        if($this->res){            $this->message = $this->_uploadFile->baseName.'.'.$this->_uploadFile->extension.'上传成功';        }else{            $this->message = $this->_uploadFile->baseName.'.'.$this->_uploadFile->extension.'上传失败';        }        return $this->res;    }    /**     * 获取文件名字     * @return null     */    public function getBaseName(){        if($this->_uploadFile){            return $this->_uploadFile->baseName;        }else{            return null;        }    }    /**     * 返回文件后缀     * @return null     */    public function getExtension(){        if($this->_uploadFile){            return $this->_uploadFile->extension;        }else{            return null;        }    }    /**     * 返回文件类型     * @return mixed     */    public function getType(){        if($this->_uploadFile){            return $this->_uploadFile->type;        }        return null;    }    /**     * 生成保持原图纵横比的缩略图，支持.png .jpg .gif     * 缩略图类型统一为.png格式     * $srcFile     原图像文件名称     * $toFile      缩略图文件名称，为空覆盖原图像文件     * $toW         缩略图宽     * $toH         缩略图高     * @return bool     */    public static function CreateThumbnail($srcFile, $toFile="", $toW=100, $toH=100)    {        if ($toFile == "") $toFile = $srcFile;        $data = getimagesize($srcFile);//返回含有4个单元的数组，0-宽，1-高，2-图像类型，3-宽高的文本描述。        if (!$data) return false;        //将文件载入到资源变量im中        switch ($data[2]) //1-GIF，2-JPG，3-PNG        {            case 1:                if(!function_exists("imagecreatefromgif")) return false;                $im = imagecreatefromgif($srcFile);                break;            case 2:                if(!function_exists("imagecreatefromjpeg")) return false;                $im = imagecreatefromjpeg($srcFile);                break;            case 3:                if(!function_exists("imagecreatefrompng")) return false;                $im = imagecreatefrompng($srcFile);                break;        }        //计算缩略图的宽高        $srcW = imagesx($im);        $srcH = imagesy($im);        $toWH = $toW / $toH;        $srcWH = $srcW / $srcH;        if ($toWH <= $srcWH) {            $ftoW = $toW;            $ftoH = (int)($ftoW * ($srcH / $srcW));        } else {            $ftoH = $toH;            $ftoW = (int)($ftoH * ($srcW / $srcH));        }        if (function_exists("imagecreatetruecolor")) {            $ni = imagecreatetruecolor($ftoW, $ftoH); //新建一个真彩色图像            if ($ni) {                //重采样拷贝部分图像并调整大小 可保持较好的清晰度                imagecopyresampled($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);            } else {                //拷贝部分图像并调整大小                $ni = imagecreate($ftoW, $ftoH);                imagecopyresized($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);            }        } else {            $ni = imagecreate($ftoW, $ftoH);            imagecopyresized($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);        }        switch ($data[2]) //1-GIF，2-JPG，3-PNG        {            case 1:                imagegif($ni, $toFile);                break;            case 2:                imagejpeg($ni, $toFile);                break;            case 3:                imagepng($ni, $toFile);                break;        }        ImageDestroy($ni);        ImageDestroy($im);        return $toFile;    }}

原文地址：http://www.yiichina.com/code/527