yii2.0使用Plupload实现带缩放功能的多图上传，

yii2.0使用Plupload实现带缩放功能的多图上传，

本文讲解了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，分享给大家供大家参考，具体内容如下

1、文章视图中调用Plupload

$model,
 'attribute'=>'cover_img',
 'url'=>'/file/upload',//处理文件上传控制器
])?>

2、\common\widgets\Plupload 组件

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.='
';
  $this->_html.=Html::activeLabel($model,$attribute);
  $this->_html.=Html::activeHiddenInput($model,$attribute,['id'=>'hidden_input','value'=>$path]);
  $this->_html .= '
';
  $this->_html.='
 ';
  UploadAsset::register($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

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('');
     $('#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




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


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 

以上就是本文的全部内容，希望对大家学习php程序设计有所帮助。



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