需要Ajax代码才能从服务器下载大型文件到客户端PC

问题描述

我有一个Download.php文件，可以下载任何类型的文件。我附上了我的Download.php：

I have a Download.php file which can download any types of file. And I have attached here my Download.php :

<?php
@apache_setenv('no-gzip', 1);
@ini_set('zlib.output_compression', 'Off');
$file_path  = $_REQUEST['file'];
$path_parts = pathinfo($file_path);
$file_name  = $path_parts['basename'];
$file_ext   = $path_parts['extension'];
$file_path  = './uploads/' . $file_name;
$is_attachment = isset($_REQUEST['stream']) ? false : true;
if (is_file($file_path))
{
	$file_size  = filesize($file_path);
	$file = @fopen($file_path,"rb");
	if ($file)
	{
		header("Pragma: public");
		header("Expires: -1");
		header("Cache-Control: public, must-revalidate, post-check=0, pre-check=0");
		header("Content-Disposition: attachment; filename=\"$file_name\"");
 
        // set appropriate headers for attachment or streamed file
        if ($is_attachment)
                header("Content-Disposition: attachment; filename=\"$file_name\"");
 else
                header('Content-Disposition: inline;');
// set the mime type based on extension, add yours if needed.
        $ctype_default = "application/octet-stream";
        $content_types = array(
                "exe" => "application/octet-stream",
                "zip" => "application/zip",
                "mp3" => "audio/mpeg",
                "mpg" => "video/mpeg",
                "avi" => "video/x-msvideo",
        );
        $ctype = isset($content_types[$file_ext]) ? $content_types[$file_ext] : $ctype_default;
        header("Content-Type: " . $ctype);
 
		//check if http_range is sent by browser (or download manager)
		if(isset($_SERVER['HTTP_RANGE']))
		{
			list($size_unit, $range_orig) = explode('=', $_SERVER['HTTP_RANGE'], 2);
			if ($size_unit == 'bytes')
			{
				//multiple ranges could be specified at the same time, but for simplicity only serve the first range
				//http://tools.ietf.org/id/draft-ietf-http-range-retrieval-00.txt
				list($range, $extra_ranges) = explode(',', $range_orig, 2);
			}
			else
			{
				$range = '';
				header('HTTP/1.1 416 Requested Range Not Satisfiable');
				exit;
			}
		}
		else
		{
			$range = '';
		}
 
		//figure out download piece from range (if set)
		list($seek_start, $seek_end) = explode('-', $range, 2);
 
		//set start and end based on range (if set), else set defaults
		//also check for invalid ranges.
		$seek_end   = (empty($seek_end)) ? ($file_size - 1) : min(abs(intval($seek_end)),($file_size - 1));
		$seek_start = (empty($seek_start) || $seek_end < abs(intval($seek_start))) ? 0 : max(abs(intval($seek_start)),0);
 
		//Only send partial content header if downloading a piece of the file (IE workaround)
		if ($seek_start > 0 || $seek_end < ($file_size - 1))
		{
			header('HTTP/1.1 206 Partial Content');
			header('Content-Range: bytes '.$seek_start.'-'.$seek_end.'/'.$file_size);
			header('Content-Length: '.($seek_end - $seek_start + 1));
		}
		else
		  header("Content-Length: $file_size");
 
		header('Accept-Ranges: bytes');
 
		set_time_limit(0);
		fseek($file, $seek_start);
 
		while(!feof($file)) 
		{
			print(@fread($file, 1024*8));
			ob_flush();
			flush();
			if (connection_status()!=0) 
			{
				@fclose($file);
				exit;
			}			
		}
 
		// file save was a success
		@fclose($file);
		exit;
	}
	else 
	{
		// file couldn't be opened
		header("HTTP/1.0 500 Internal Server Error");
		exit;
	}
}
else
{
	// file does not exist
	header("HTTP/1.0 404 Not Found");
	exit;
}
?>

现在，我需要一个Ajax代码将由按钮中的单击事件执行，以下载存在于服务器位置的MyFile.exe：/ files / MyFile.exe。

我想添加进度吧看看下载的进度。





谢谢。

Now, I need a Ajax code which will execute by a click event in button to download MyFile.exe which exist in the server location: "/files/MyFile.exe".
And I want to add a progress bar to see the progress of downloading.


Thank you.

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