<?php/** * Created by PhpStorm. * User: Administrator * Date: 2016/11/24 0024 * Time: 14:38 */namespace app\controllers;use yii\web\Controller;use app\models\FetchFiles;class FetchFilesController extends Controller{    public $file_path = ‘http://www.yii2.com/uploads/temp/read.bmp‘;    public function actionReadFile(){        $file_path = $this->file_path;       // echo  $file_path;        //die;        $FetchFiles = new FetchFiles();      $FetchFiles->actionReadFile($file_path);    }}

<?php/** * Created by PhpStorm. * User: Administrator * Date: 2016/11/24 0024 * Time: 16:53 */namespace app\models;use yii\base\Model;class FetchFiles extends Model{    /**     *转换路径为虚拟路径,返回给客户     */    public  function actionVirtualFile(){        //virtualfile需要改为控制器名字，每次访问转换调用控制器去访问        $file_path = $this->file_path;        $file_path = str_replace(‘uploads/temp‘,‘virtualfile‘,$file_path);        echo($file_path);    }//客户访问资源时候，转换真实路径    public function  actionReadFile($file_path){        //获取真实资源路径        $file_path = str_replace(‘virtualfile‘,‘uploads/temp‘,$file_path);      //  Header("Location: $file_path");        //die();        //判断文件；类型        $fileType =  substr(strrchr($file_path, ‘.‘), 1);        //统一转换为小写        $fileType = strtolower($fileType);        //选择文件类型，根据文件类型调用不同方法读取文件        switch($fileType){            case ‘png‘:                $this->actionReadImg($file_path,$fileType);                break;            case ‘jpg‘:                $this->actionReadImg($file_path,$fileType);                break;            case ‘jpeg‘:                $this->actionReadImg($file_path,$fileType);                break;                break;            case ‘bmp‘:                $this->actionReadImg($file_path,$fileType);                break;            case ‘txt‘:                $this->actionReadTxt($file_path);                break;            default:                echo  $fileType. "文件类型不支持查看，请直接下载！";        }        // echo $fileType;        // echo file_get_contents("$file_path");    }    //读取txt文档的方法    public function actionReadTxt($file_path){        //echo ‘使用访问文件的方法‘.$file_path;      //  $content = file_get_contents($file_path);        $handle = fopen("$file_path", ‘r‘);        $content = ‘‘;        while(false != ($a = fread($handle, 8080))){//返回false表示已经读取到文件末尾            $content .= $a;        }        fclose($handle);        //转码，确保文档是utf-8;        $content =  iconv(‘GB2312‘, ‘UTF-8‘, $content);       echo $content;    }    //读取图片的方法    public function actionReadImg($file_path,$fileType){        $contents=file_get_contents($file_path);        //设置图片的头文件        $header = ‘Content-Type: image/‘.$fileType;        header( "$header" );//访问图片        base64_decode($contents);        echo $contents;    }}