NodeJS:如何获取服务器的端口? [英] NodeJS: How to get the server's port?
问题描述
您经常会看到 Node 的示例 hello world 代码,它创建了一个 Http 服务器,开始侦听端口,然后是类似以下内容的代码:
You often see example hello world code for Node that creates an Http Server, starts listening on a port, then followed by something along the lines of:
console.log('Server is listening on port 8000');
但理想情况下你会想要这个:
But ideally you'd want this instead:
console.log('Server is listening on port ' + server.port);
如何在调用 server.listen()
之前检索服务器当前正在侦听的端口而不将数字存储在变量中?
How do I retrieve the port the server is currently listening on without storing the number in a variable prior to calling server.listen()
?
我以前见过这样做过,但在 Node 文档中找不到.可能是为了表达什么?
I've seen this done before but I can't find it in the Node documentation. Maybe it's something specific to express?
推荐答案
Express 4.x 答案:
Express 4.x(根据下面的 Tien Do 的回答),现在将 app.listen() 视为异步操作,因此 listener.address() 将仅返回 app.listen() 回调内的数据:>
Express 4.x (per Tien Do's answer below), now treats app.listen() as an asynchronous operation, so listener.address() will only return data inside of app.listen()'s callback:
var app = require('express')();
var listener = app.listen(8888, function(){
console.log('Listening on port ' + listener.address().port); //Listening on port 8888
});
表达 3 个答案:
我认为您正在寻找这个(具体表达?):
I think you are looking for this(express specific?):
console.log("Express server listening on port %d", app.address().port)
当您从 express
命令创建目录结构时,您可能已经看到了这一点(底线):
You might have seen this(bottom line), when you create directory structure from express
command:
alfred@alfred-laptop:~/node$ express test4
create : test4
create : test4/app.js
create : test4/public/images
create : test4/public/javascripts
create : test4/logs
create : test4/pids
create : test4/public/stylesheets
create : test4/public/stylesheets/style.less
create : test4/views/partials
create : test4/views/layout.jade
create : test4/views/index.jade
create : test4/test
create : test4/test/app.test.js
alfred@alfred-laptop:~/node$ cat test4/app.js
/**
* Module dependencies.
*/
var express = require('express');
var app = module.exports = express.createServer();
// Configuration
app.configure(function(){
app.set('views', __dirname + '/views');
app.use(express.bodyDecoder());
app.use(express.methodOverride());
app.use(express.compiler({ src: __dirname + '/public', enable: ['less'] }));
app.use(app.router);
app.use(express.staticProvider(__dirname + '/public'));
});
app.configure('development', function(){
app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
});
app.configure('production', function(){
app.use(express.errorHandler());
});
// Routes
app.get('/', function(req, res){
res.render('index.jade', {
locals: {
title: 'Express'
}
});
});
// Only listen on $ node app.js
if (!module.parent) {
app.listen(3000);
console.log("Express server listening on port %d", app.address().port)
}
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