yii2.0使用Plupload实现带缩放功能的多图上传

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

<?php
namespace commonwidgets;
use backendassetsUploadAsset;
use yii;
use yiihelpersHtml;
use yiibaseException;
class Plupload extends yiibootstrapWidget{
 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;
 }
}

<?php
namespace backendassets;
use yiiwebAssetBundle;
class UploadAsset extends AssetBundle
{
 public $basePath = '@webroot';
 public $baseUrl = '@web';
 public $css = [
 ];
 public $js = [
  'js/upload.js'
 ];
 public $depends = [
  'backendassetsPluploadAsset',];
}

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();
}

<?php
namespace backendassets;
use yiiwebAssetBundle;
class PluploadAsset extends AssetBundle
{
 public $sourcePath = '@vendor/moxiecode/plupload';
 public $css = [
 ];
 public $js = [
  'js/plupload.full.min.js',];
 public $depends = [
  'yiiwebJqueryAsset',];
}

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()];
  }
 }
}

<?php
namespace commonmodels;
use yiibaseException;
use yiihelpersFileHelper;
use yiiwebUploadedFile;
class ImageUpload extends yiibaseObject
{
 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/x-png','image/x-png'];
 private $_uploadFile;//上传文件
 private $filePath;//文件路径
 private $urlPath;//拜访路径
 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,$ftoW,$ftoH,$srcW,$srcH);
   } else {
    //拷贝部分图像并调整大小
    $ni = imagecreate($ftoW,$ftoH);
    imagecopyresized($ni,$srcH);
   }
  } else {
   $ni = imagecreate($ftoW,$ftoH);
   imagecopyresized($ni,$srcH);
  }
  switch ($data[2]) //1-GIF,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;
 }
}