Nginx+Node.js搭建图片服务器

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图片上传请求由 Node 处理，图片访问请求由 Nginx 处理。

1、Nginx 配置

#user nobody;
worker_processes 1;

#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;

#pid logs/nginx.pid;

events {
worker_connections 1024;
}

http {
include mime.types;
default_type application/octet-stream;

#log_format main ‘$remote_addr – $remote_user [$time_local] “$request” ‘
# ‘$status $body_bytes_sent “$http_referer” ‘
# ‘”$http_user_agent” “$http_x_forwarded_for”‘;

#access_log logs/access.log main;

sendfile on;
tcp_nopush on;
sendfile_max_chunk 256K;

#keepalive_timeout 0;
keepalive_timeout 65;

#gzip on;

upstream localhost {
server localhost:3000;#node 服务器
}

server {
listen 80;
server_name localhost;

#开启索引功能
autoindex on;

#关闭计算文件确切大小
autoindex_exact_size off;

#charset koi8-r;

#access_log logs/host.access.log main;

#上传操作由 node 服务器处理
location / {
proxy_pass http://localhost;
index index.html;
}

#映射图片访问 url
location /image/ {
expires 30d;# 缓存时间
root E:/Study/nginx/nginx-1.7.6/files;
}

#error_page 404 /404.html;

# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}

# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}

# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
# root html;
# fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
# include fastcgi_params;
#}

# deny access to .htaccess files, if Apache’s document root
# concurs with nginx’s one
#
#location ~ /\.ht {
# deny all;
#}
}

# another virtual host using mix of IP-, name-, and port-based configuration
#
#server {
# listen 8000;
# listen somename:8080;
# server_name somename alias another.alias;

# location / {
# root html;
# index index.html index.htm;
# }
#}

# HTTPS server
#
#server {
# listen 443 ssl;
# server_name localhost;

# ssl_certificate cert.pem;
# ssl_certificate_key cert.key;

# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 5m;

# ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on;

# location / {
# root html;
# index index.html index.htm;
# }
#}

}

2、nodejs 项目架构

1）项目结构图

Nginx+Node.js 搭建图片服务器

2）bin/www 是启动脚本

#!/usr/bin/env node
var debug = require(‘debug’)(‘file-server’);
var app = require(‘../app’);

app.set(‘port’, process.env.PORT || 3000);

var server = app.listen(app.get(‘port’), function() {
console.log(‘Express server listening on port ‘ + server.address().port);
debug(‘Express server listening on port ‘ + server.address().port);
});

3）config/setting.json 是程序中用的一些常量以 json 格式配置

{
“image_url”:”http://localhost/image”,
“image_dir”:”E:/Study/nginx/nginx-1.7.6/files/image”,
“tmp_dir”:”E:/Study/nginx/nginx-1.7.6/tmp”
}

4）controller/file-ctrl.js 是文件上传的处理代码

var fs = require(‘fs’);
var path = require(‘path’);
var formidable = require(‘formidable’);
var util = require(‘util’);
var fs = require(‘fs’);
var path = require(‘path’);

var setting = require(‘../config/setting.json’);

/**
* 上传
*/
exports.upload = function(req,res){

var form = new formidable.IncomingForm();
form.encoding = ‘utf-8’;

// 如果需要临时文件保持原始文件扩展名，设置为 true
form.keepExtensions = false;

// 文件大小限制，默认 2MB
form.maxFieldsSize = 2 * 1024 * 1024;

// 图片存放目录
var imageDir = setting.image_dir;

// 上传临时目录
var tmpDir = setting.tmp_dir;

form.uploadDir = tmpDir;// 目录需要已存在
/**
* fields 表单中的其他属性
* files 文件集合
*/
form.parse(req, function(err, fields, files) {

// 图片完整路径
var imagePath = path.resolve(imageDir, files.file.name);

// 将临时目录中的图片移动到图片存放目录下
fs.rename(files.file.path,imagePath,function(err){
if(err) {
res.json({‘success’:false,’msg’:err});
}else{
var image_url = setting.image_url+’/’+files.file.name;
res.json({‘success’:true,’msg’:’ 上传成功！’,’image_url’:image_url});
//res.json({‘success’:true,’msg’:’ 上传成功！’,’image_url’:image_url,’fields’:util.inspect({fields: fields, files: files})});
}
});
});
}

/**
* 下载
*/
exports.download = function(req,res){
var filename = req.params.filename;
var dir = setting.file_dir;
var file_path = path.resolve(dir,filename);
fs.exists(file_path,function(exists) {
if(!exists) {
res.json({‘success’:false,’msg’:’ 文件不存在！’});
}else{
res.download(file_path,function(err){
if(err) {
res.json({‘success’:false,’msg’:err});
}
});

}
});
}

5）routes/route.js 是整个项目的路由控制

var express = require(‘express’);
var router = express.Router();

var file_ctrl = require(‘../controller/file-ctrl’)

/** 上传文件 */
router.post(‘/upload’,file_ctrl.upload);

module.exports = router;

6）app.js 是项目的全局配置

var express = require(‘express’);
var path = require(‘path’);
var favicon = require(‘static-favicon’);
var logger = require(‘morgan’);
var cookieParser = require(‘cookie-parser’);
var bodyParser = require(‘body-parser’);

var routes = require(‘./routes/route’);

var app = express();

// view engine setup
app.set(‘views’, path.join(__dirname, ‘views’));
app.set(‘view engine’, ‘jade’);

app.use(favicon());
app.use(logger(‘dev’));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded());
app.use(cookieParser());
app.use(express.static(path.join(__dirname, ‘public’)));

app.use(‘/’, routes);

/// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error(‘Not Found’);
err.status = 404;
next(err);
});

/// error handlers

// development error handler
// will print stacktrace
if (app.get(‘env’) === ‘development’) {
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render(‘error’, {
message: err.message,
error: err
});
});
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render(‘error’, {
message: err.message,
error: {}
});
});

module.exports = app;

6）package.json 是依赖包管理

{
“name”: “file-server”,
“version”: “0.0.1”,
“private”: true,
“scripts”: {
“start”: “node ./bin/www”
},
“dependencies”: {
“express”: “~4.2.0”,
“static-favicon”: “~1.0.0”,
“morgan”: “~1.0.0”,
“cookie-parser”: “~1.0.1”,
“body-parser”: “~1.0.0”,
“debug”: “~0.7.4”,
“jade”: “~1.3.0”,
“formidable”:”*”
}
}

项目用到了 expressjs 框架。

3、简单写一个 html 上传页面

<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”>
<html>
<head>

<title>upload</title>
<meta http-equiv=”pragma” content=”no-cache”>
<meta http-equiv=”cache-control” content=”no-cache”>
<meta http-equiv=”expires” content=”0″>
<meta http-equiv=”keywords” content=”keyword1,keyword2,keyword3″>
<meta http-equiv=”description” content=”This is my page”>
<!–
<link rel=”stylesheet” type=”text/css” href=”https://www.linuxidc.com/Linux/2015-08/styles.css”>
–>
</head>

<body>
<form action=”http://localhost/upload” method=”post” enctype=”multipart/form-data”>
<input type=”file” name=”file”>
<p>
<input type=”submit” value=” 上传 ”>
</form>
</body>
</html>