用下面用nginx+mongodb+php实现一个简单的存储系统，提供简单的文件上传下载功能(下载支持Range头)。
（后台用磁盘和mongo的gridfs分别存储大于1M和小于等于1M的文件）
A，前台文件上传页面（同时列举所有文件）(test.php)
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
</head>
<body>
<!--查询meta中所有文件-->
<ul>
<?php
$mongo = new Mongo();
$db = $mongo->selectDB("ciaos");
$meta = $db->meta;
$cursor = $meta->find();
foreach ($cursor as $doc) {
$filename = $doc["filename"];
echo "<li><a href=\"dl/$filename\">$filename</a></li>";
}
?>
</ul>
<form enctype="multipart/form-data" action="upload.php" method="POST">
<!-- Name of input element determines name in $_FILES array -->
Send this file: <input name="Filedata" id="Filedata" type="file" />
<input name="submit" type="submit" value="Send File" />
</form>
</body>
</html>
B，服务器端文件上传(upload.php)
<?php
// 存放文件的磁盘位置
$targetFolder = '/files';
if (!empty($_FILES)) {
//获取上传文件的临时文件，大小，设置存储路径
$tempFile = $_FILES['Filedata']['tmp_name'];
$size = $_FILES['Filedata']['size'];
$targetPath = $_SERVER['DOCUMENT_ROOT'] . $targetFolder;
$targetFile = rtrim($targetPath,'/') . '/' . $_FILES['Filedata']['name'];
$mongo = new Mongo();
$db = $mongo->selectDB("ciaos");
//大于1M的文件放在磁盘中，然后写meta信息
if($size > 1024*1024) {
move_uploaded_file($tempFile,$targetFile);
$newfile = array(
"filename" => $_FILES['Filedata']['name'],
"savename" => $targetFile,
"size" => $size
);
} else { //小文件存放在mongofs中，然后写meta
$gridfs = $db->getGridFS();
$mid = $gridfs->put($tempFile);
$newfile = array(
"filename" => $_FILES['Filedata']['name'],
"mid" => $mid,
"size" => $size
);
}
//meta中存储文件名信息，mongoID或者存储名称以及文件大小
$meta = $db->meta;
$meta->save($newfile);
echo "Upload succeed";
}
else {
echo "Upload failed";
}
exit();
?>
C，文件下载逻辑(download.php)
<?php
$file = isset($_GET["file"])?$_GET["file"]:NULL;
if ($file) {
//去meta中查询文件信息
$mongo = new Mongo();
$db = $mongo->selectDB("ciaos");
$meta = $db->meta;
$search = array(
"filename"=>$file
);
$search_result = $meta->findOne($search);
$size= $search_result["size"];
//如果文件大于1M，转到磁盘下载
if($size > 1024*1024) {
header("Content-type: application/octet-stream");
header("X-Accel-Redirect: /files/" . $file);
} else { //小文件则从mongofs中读取存放在临时文件中，然后转临时文件下载
$gridfs = $db->getGridFS();
$mid = $search_result["mid"];
$fsfile = $gridfs->get($mid);
$tmpname = "tmp".time();
file_put_contents("./files/$tmpname",$fsfile->getBytes());
header("Content-type: application/octet-stream");
header("X-Accel-Redirect: /files/" . $tmpname);
}
}
else {
echo "Invalid filename";
}
?>
如果下载文件名为download.php，可以加上这样一个头指定文件名header("Content-Disposition: attachment; filename= $filename");
daemon启动方法：bin/mongod --fork --logpath /data/db/mongodb.log（需要有/data/db/目录用于存放数据）
D，数据库中存储小文件内容以及meta信息，查询结果分别如下
> db.fs.files.find()
{ "_id" : ObjectId("50b5d1a892a5f27a0f000001"), "filename" : "/usr/local/NSP/var/php_upload_tmp/phpmgM6IS", "uploadDate" : ISODate("2012-11-28T08:56:08.480Z"), "length" : 13, "chunkSize" : 262144, "md5" : "d4369b7a8614277c011ef987ca4e16ee" }
{ "_id" : ObjectId("50b5ddb592a5f2452f000001"), "filename" : "/usr/local/NSP/var/php_upload_tmp/php4hu6fi", "uploadDate" : ISODate("2012-11-28T09:47:33.094Z"), "length" : 13, "chunkSize" : 262144, "md5" : "d4369b7a8614277c011ef987ca4e16ee" }
>
> db.meta.find()
{ "_id" : ObjectId("50b5d8ca92a5f2b42d000000"), "filename" : "dbank-sdk-cpp-0.5.5.zip", "savename" : "/usr/local/NSP/htdocs/files/dbank-sdk-cpp-0.5.5.zip", "size" : 4380805 }
{ "_id" : ObjectId("50b5ddb592a5f2452f000003"), "filename" : "测试.txt", "mid" : ObjectId("50b5ddb592a5f2452f000001"), "size" : 13 }
>
E，nginx核心配置(nginx.conf)
location / {
index index.html index.htm index.php;
rewrite ^/dl/(.*) /download.php?file=$1 last;
}
location /files {
root /usr/local/ciaos/html/;
internal;
}
location ~ .*\.php$ {
fastcgi_index index.php;
fastcgi_pass unix:/usr/local/ciaos/php_fcgi.socket;
include /usr/local/ciaos/fastcgi.conf;
}
nginx的配置主要需要注意下面几点：
1,支持php服务器端脚本运行
2,配置下载目录/files，设置为internal内部访问，这样可以避免用户直接下载磁盘，可以自定义鉴权等功能
3,配置路径转发，前台的下载路径看起来就是这样http://localhost/dl/test.txt，后台通过download.php实现下载功能。