我已经使用了可在线获得的脚本。 File upload.php允许用户上传文件，然后将所选文件存储在MySQL数据库中。稍后，download.php脚本显示存储在数据库中的所有文件的链接。当用户单击该链接时，应下载该文件。我附上了下面的脚本。但问题是，当我点击链接时，文件内容会显示而不是下载。
<!--
CREATE TABLE IF NOT EXISTS `upload` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(30) NOT NULL,
`type` varchar(30) NOT NULL,
`size` int(11) NOT NULL,
`content` longblob NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=5 ;
-->
<html>
<head></head>
<body>
<form method="post" enctype="multipart/form-data">
<table width="350" border="0" cellpadding="1"
cellspacing="1" class="box">
<tr>
<td>please select a file</td></tr>
<tr>
<td>
<input type="hidden" name="MAX_FILE_SIZE"
value="16000000">
<input name="userfile" type="file" id="userfile">
</td>
<td width="80"><input name="upload"
type="submit" class="box" id="upload" value=" Upload "></td>
</tr>
</table>
</form>
</body>
</html>
<?php
if (isset($_POST['upload']) && $_FILES['userfile']['size'] > 0) {
$fileName = $_FILES['userfile']['name'];
$tmpName = $_FILES['userfile']['tmp_name'];
$fileSize = $_FILES['userfile']['size'];
$fileType = $_FILES['userfile']['type'];
$fileType = (get_magic_quotes_gpc() == 0 ? mysql_real_escape_string(
$_FILES['userfile']['type']) : mysql_real_escape_string(
stripslashes($_FILES['userfile'])));
$fp = fopen($tmpName, 'r');
$content = fread($fp, filesize($tmpName));
$content = addslashes($content);
fclose($fp);
if (!get_magic_quotes_gpc()) {
$fileName = addslashes($fileName);
}
$con = mysql_connect('localhost', 'root', 'root') or die(mysql_error());
$db = mysql_select_db('test', $con);
if ($db) {
$query = "INSERT INTO upload (name, size, type, content ) " .
"VALUES ('$fileName', '$fileSize', '$fileType', '$content')";
mysql_query($query) or die('Error, query failed');
mysql_close();
echo "<br>File $fileName uploaded<br>";
} else {
echo "file upload failed";
}
}
?>
<html>
<head>
<title>Download File From MySQL Database</title>
<meta http-equiv="Content-Type" content="text/html;
charset=iso-8859-1">
</head>
<body>
<?php
$con = mysql_connect('localhost', 'root', 'root') or die(mysql_error());
$db = mysql_select_db('test', $con);
$query = "SELECT id, name FROM upload";
$result = mysql_query($query) or die('Error, query failed');
if (mysql_num_rows($result) == 0) {
echo "Database is empty <br>";
} else {
while (list($id, $name) = mysql_fetch_array($result)) {
?>
<a href="download.php?id=<?php echo urlencode($id); ?>"
><?php echo urlencode($name); ?></a> <br>
<?php
}
}
mysql_close();
?>
</body>
</html>
<?php
if (isset($_GET['id'])) {
$con = mysql_connect('localhost', 'root', 'root') or die(mysql_error());
$db = mysql_select_db('test', $con);
$id = $_GET['id'];
$query = "SELECT name, type, size, content " .
"FROM upload WHERE id = '$id'";
$result = mysql_query($query) or die('Error, query failed');
list($name, $type, $size, $content) = mysql_fetch_array($result);
header("Content-length: $size");
header("Content-type: $type");
header("Content-Disposition: attachment; filename=$name");
ob_clean();
flush();
echo $content;
mysql_close();
exit;
}
?>
答案 0 :(得分：5)
download.php也会在顶部显示所有HTML。您需要将整个部分放在if中，以便在下载开始时不会放置它：
if (!isset($_GET['id']) { ?>
<html>
...
</html>
<?php } else {
$con = mysql_connect('localhost', 'root', 'root') or die(mysql_error());
... // rest of script
}