<?php    header("Content-Type:text/html; charset=utf-8");    function download($file_path){        $file_path=iconv("utf-8","gb2312",$file_path);                if(!is_file($file_path)){            die ("<b>file not found!</b>");        }                if(!file_exists($file_path)){            die("<b>file not found!</b>");        }                $dir_name = dirname($file_path);        $file_name = basename($file_path);        $len = filesize($file_path);        $file_extension = strtolower(substr(strrchr($file_name,"."),1));//文件后缀                        //根据文件后缀判断content-type        switch ($file_extension)        {            case "pdf" :                $ctype = "application/pdf";                break;            case "exe" :                $ctype = "application/octet-stream";                break;            case "zip" :                $ctype = "application/zip";                break;            case "doc" :                $ctype = "application/msword";                break;            case "xls" :                $ctype = "application/vnd.ms-excel";                break;            case "ppt" :                $ctype = "application/vnd.ms-powerpoint";                break;            case "gif" :                $ctype = "image/gif";                break;            case "png" :                $ctype = "image/png";                break;            case "jpeg" :            case "jpg" :                $ctype = "image/jpg";                break;            case "mp3" :                $ctype = "audio/mpeg";                break;            case "wav" :                $ctype = "audio/x-wav";                break;            case "mpeg" :            case "mpg" :            case "mpe" :                $ctype = "video/mpeg";                break;            case "mov" :                $ctype = "video/quicktime";                break;            case "avi" :                $ctype = "video/x-msvideo";                break;                        // The following are for extensions that shouldn‘t be downloaded            // (sensitive stuff, like php files)            case "php" :            case "htm" :            case "html" :            case "txt" :                die ( "<b>Cannot download " . $file_extension . " files!</b>" );                break;                        default :                $ctype = "application/force-download";        }                //缓存控制        header("Cache-Control: public" );        header("Cache-Control: must-revalidate, post-check=0, pre-check=0" );        header("Pragma: no-cache" );        header("Expires: 0" );         header("Content-Description: File Transfer" );        //设置下载文件类型以及文件名        header("Content-type: ".$ctype);        header("Accept-Ranges: bytes");        header("Content-Disposition: attachment; filename=".$file_name);        header("Content-Transfer-Encoding: binary" );        header("Content-Length: ".$len );                //读取文件并写给客户端        $resource= fopen($file_path,"rb");        $block_size= 1024;         $count = 0;        while(!feof($resource) && $count<$len){            echo fread($resource,$block_size);            $count+= $block_size;        }        fclose($resource);    }        //=============================begin process==================================        $dir="D:\\";        if(!is_dir($dir)){        die("dir not right!");    }        $dir= rtrim(str_replace("\\","/",$dir),"/")."/";        //接受请求参数    if(!empty($_GET) && isset($_GET["file"])){        $file = $_GET["file"];    }        if(isset($file)){//如果有请求参数，就下载        download($dir.$file);    }else{//打印出对应文件夹下面的文件(不递归，不包含文件夹)        $dir=iconv("utf-8","gb2312",$dir);        $files = array();        if (is_dir($dir)) {            if ($dh = opendir($dir)) {                while (($file = readdir($dh)) !== false) {                    if(is_file($dir.$file)){                        array_push($files,$file);                    }                }                closedir($dh);            }        }                if(empty($files)){            echo "<b>no file in directory $dir</b>";        }else{            foreach($files as $one){            $one = iconv("gb2312","utf-8",$one);            echo "<p>$one <a href=http://www.mamicode.com/‘download.php?file=$one‘>点击下载</a></p>";            }        }    }?>