Supported functions:
Read static files
Accessing the directory can automatically find the following index.html file, if If there is no index.html, list the files
MIME type support
Cache support/control
Support gzip compression
Range support, breakpoint resume transmission
Global command execution
Subprocess running
This article mainly introduces examples of actual node static file servers. I hope it can help you.
1. Create a service to read static files
First introduce the http module, create a server, and listen to the configuration port:
const http = require('http');
const server = http.createServer();
// 监听请求
server.on('request', request.bind(this));
server.listen(config.port, () => {
console.log(`静态文件服务启动成功, 访问localhost:${config.port}`);
});Write a fn specifically to handle requests and return static files. The url module obtains the path:
const url = require('url');
const fs = require('fs');
function request(req, res) {
const { pathname } = url.parse(req.url); // 访问路径
const filepath = path.join(config.root, pathname); // 文件路径
fs.createReadStream(filepath).pipe(res); // 读取文件，并响应
}Supports finding index.html:
if (pathname === '/') {
const rootPath = path.join(config.root, 'index.html');
try{
const indexStat = fs.statSync(rootPath);
if (indexStat) {
filepath = rootPath;
}
} catch(e) {
}
}When accessing the directory, list the file directory:
fs.stat(filepath, (err, stats) => {
if (err) {
res.end('not found');
return;
}
if (stats.isDirectory()) {
let files = fs.readdirSync(filepath);
files = files.map(file => ({
name: file,
url: path.join(pathname, file)
}));
let html = this.list()({
title: pathname,
files
});
res.setHeader('Content-Type', 'text/html');
res.end(html);
}
}html template:
function list() {
let tmpl = fs.readFileSync(path.resolve(__dirname, 'template', 'list.html'), 'utf8');
return handlebars.compile(tmpl);
} <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>{{title}}</title>
</head>
<body>
<h1>hope-server静态文件服务器</h1>
<ul>
{{#each files}}
<li>
<a href={{url}}>{{name}}</a>
</li>
{{/each}}
</ul>
</body>
</html>2.MIME type support
Use the mime module to get the file type, And set the encoding:
res.setHeader('Content-Type', mime.getType(filepath) + ';charset=utf-8');
3. Cache support
http protocol cache:
Cache-Control: http1.1 Content, tells the client how to cache the data, and the rules
private The client can cache
public Both the client and the proxy server can cache
max-age=60 The cached content will expire after 60 seconds
handleCache(req, res, stats, hash) {
// 当资源过期时, 客户端发现上一次请求资源，服务器有发送Last-Modified, 则再次请求时带上if-modified-since
const ifModifiedSince = req.headers['if-modified-since'];
// 服务器发送了etag,客户端再次请求时用If-None-Match字段来询问是否过期
const ifNoneMatch = req.headers['if-none-match'];
// http1.1内容 max-age=30 为强行缓存30秒 30秒内再次请求则用缓存 private 仅客户端缓存，代理服务器不可缓存
res.setHeader('Cache-Control', 'private,max-age=30');
// http1.0内容 作用与Cache-Control一致 告诉客户端什么时间，资源过期 优先级低于Cache-Control
res.setHeader('Expires', new Date(Date.now() + 30 * 1000).toGMTString());
// 设置ETag 根据内容生成的hash
res.setHeader('ETag', hash);
// 设置Last-Modified 文件最后修改时间
const lastModified = stats.ctime.toGMTString();
res.setHeader('Last-Modified', lastModified);
// 判断ETag是否过期
if (ifNoneMatch && ifNoneMatch != hash) {
return false;
}
// 判断文件最后修改时间
if (ifModifiedSince && ifModifiedSince != lastModified) {
return false;
}
// 如果存在且相等，走缓存304
if (ifNoneMatch || ifModifiedSince) {
res.writeHead(304);
res.end();
return true;
} else {
return false;
}
} getEncoding(req, res) {
const acceptEncoding = req.headers['accept-encoding'];
// gzip和deflate压缩
if (/\bgzip\b/.test(acceptEncoding)) {
res.setHeader('Content-Encoding', 'gzip');
return zlib.createGzip();
} else if (/\bdeflate\b/.test(acceptEncoding)) {
res.setHeader('Content-Encoding', 'deflate');
return zlib.createDeflate();
} else {
return null;
}
} getStream(req, res, filepath, statObj) {
let start = 0;
let end = statObj.size - 1;
const range = req.headers['range'];
if (range) {
res.setHeader('Accept-Range', 'bytes');
res.statusCode = 206;//返回整个内容的一块
let result = range.match(/bytes=(\d*)-(\d*)/);
if (result) {
start = isNaN(result[1]) ? start : parseInt(result[1]);
end = isNaN(result[2]) ? end : parseInt(result[2]) - 1;
}
}
return fs.createReadStream(filepath, {
start, end
});
} {
bin: {
"hope-server": "bin/hope"
}
} // 告诉电脑用node运行我的文件
#! /usr/bin/env node
const yargs = require('yargs');
const init = require('../src/index.js');
const argv = yargs.option('d', {
alias: 'root',
demand: 'false',
type: 'string',
default: process.cwd(),
description: '静态文件根目录'
}).option('o', {
alias: 'host',
demand: 'false',
default: 'localhost',
type: 'string',
description: '配置监听的主机'
}).option('p', {
alias: 'port',
demand: 'false',
type: 'number',
default: 8080,
description: '配置端口号'
}).option('c', {
alias: 'child',
demand: 'false',
type: 'boolean',
default: false,
description: '是否子进程运行'
})
.usage('hope-server [options]')
.example(
'hope-server -d / -p 9090 -o localhost', '在本机的9090端口上监听客户端的请求'
).help('h').argv;
// 启动服务
init(argv);
const { spawn } = require('child_process');
const Server = require('./hope');
function init(argv) {
// 如果配置为子进程开启服务
if (argv.child) {
//子进程启动服务
const child = spawn('node', ['hope.js', JSON.stringify(argv)], {
cwd: __dirname,
detached: true,
stdio: 'inherit'
});
//后台运行
child.unref();
//退出主线程，让子线程单独运行
process.exit(0);
} else {
const server = new Server(argv);
server.start();
}
}
module.exports = init;
hope.js
if (process.argv[2] && process.argv[2].startsWith('{')) {
const argv = JSON.parse(process.argv[2]);
const server = new Hope(argv);
server.start();
}npm install hope-server -g
hope-server
A simple HTTP static file written using nodejs and Python Server
A simple HTTP static file server written in nodejs and Python_node.js
Node.js static file server improved version_ node.js
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