blocks|key|806226|text|使用最新的node.js+(v0.3.8-pre)：我查看了文档，检查了http.createServer()返回的服务器实例，并阅读了server.listen()的源代码...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|806227|遗憾的是，端口只是临时存储为本地变量，并在调用本机方法process.binding('net').bind()时作为参数结束。我没有看得更远。|806228|似乎没有比保留对您提供给server.listen()的端口值的引用更好的方法了。|806229|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

With latest node.js (v0.3.8-pre): I checked the documentation, inspected the server instance returned by http.createServer(), and read the source code of server.listen()...

Sadly, the port is only stored temporarily as a local variable and ends up as an argument in a call to process.binding('net').bind() which is a native method. I did not look further.

It seems that there is no better way than keeping a reference to the port value that you provided to server.listen().

blocks|key|806275|text|在当前版本(v0.5.0-之前)中，端口似乎可以作为服务器对象的属性使用，请参见http://nodejs.org/docs/v0.4.7/api/net.html#server.address|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|806276|var+server+=+http.createServer(function(req,+res)+{
++++...
}

server.listen(8088);
console.log(server.address());
console.log(server.address().address);
console.log(server.address().port);|code-block|syntax|javascript|806277|输出|806278|{+address:+'0.0.0.0',+port:+8088+}
0.0.0.0
8088|806279|entityMap|0|LINK|mutability|MUTABLE|url|http://nodejs.org/docs/v0.4.7/api/net.html#server.address^0|14|1L|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

In the current version (v0.5.0-pre) the port seems to be available as a property on the server object, see <a href="http://nodejs.org/docs/v0.4.7/api/net.html#server.address" rel="noreferrer">http://nodejs.org/docs/v0.4.7/api/net.html#server.address</a>

<pre><code>var server = http.createServer(function(req, res) {
 ...
}

server.listen(8088);
console.log(server.address());
console.log(server.address().address);
console.log(server.address().port);
</code></pre>

outputs

<pre><code>{ address: '0.0.0.0', port: 8088 }
0.0.0.0
8088
</code></pre>

blocks|key|1021027|text|在express+v3.0中，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1021028|/*+No+longer+valid+*/
var+app+=+express.createServer();
app.listen();
console.log('Server+running+on+%25s',+app.address().port);|code-block|syntax|javascript|1021029|不再起作用了！对于Express+v3.0，您应该这样创建一个应用程序和一个服务器：|1021030|var+express+=+require('express');
var+http+=+require('http');

var+app+=+express();
var+server+=+http.createServer(app);

app.get('/',+function(req,+res)+{
++++res.send("Hello+World!");
});

server.listen(3000);
console.log('Express+server+started+on+port+%25s',+server.address().port);|1021031|我自己遇到了这个问题，并想记录下新的语法。在https://github.com/visionmedia/express/wiki/Migrating-from-2.x-to-3.x上可以看到Expressv3.0中的这一变化和其他变化|offset|length|1021032|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/visionmedia/express/wiki/Migrating-from-2.x-to-3.x^0|0|0|0|0|M|1X|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

In express v3.0, 

<pre><code>/* No longer valid */
var app = express.createServer();
app.listen();
console.log('Server running on %s', app.address().port);
</code></pre>

no longer works! For Express v3.0, you should create an app and a server this way:

<pre><code>var express = require('express');
var http = require('http');

var app = express();
var server = http.createServer(app);

app.get('/', function(req, res) {
 res.send("Hello World!");
});

server.listen(3000);
console.log('Express server started on port %s', server.address().port);
</code></pre>

I ran in to this issue myself and wanted to document the new syntax. This and other changes in Express v3.0 are visible at <a href="https://github.com/visionmedia/express/wiki/Migrating-from-2.x-to-3.x" rel="noreferrer">https://github.com/visionmedia/express/wiki/Migrating-from-2.x-to-3.x</a>

blocks|key|1021092|text|如果你使用的是express，你可以从request对象中获取：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1021093|req.app.settings.port+//+=>+8080+or+whatever+your+app+is+listening+at.|code-block|syntax|javascript|1021094|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you're using express, you can get it from the request object:

<pre><code>req.app.settings.port // =&gt; 8080 or whatever your app is listening at.
</code></pre>

blocks|key|806503|text|对于express/restify/connect，findandbind+npm解决了这个问题：https://github.com/gyllstromk/node-find-and-bind|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|806504|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/gyllstromk/node-find-and-bind^0|Q|B|1D|1C|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

The <code>findandbind</code> npm addresses this for express/restify/connect: <a href="https://github.com/gyllstromk/node-find-and-bind" rel="nofollow">https://github.com/gyllstromk/node-find-and-bind</a>

blocks|key|1021204|text|如果您在处理请求时需要端口，而app不可用，您可以使用以下方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1021205|request.socket.localPort|code-block|syntax|javascript|1021206|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In case when you need a port at the time of request handling and app is not available, you can use this:

<pre><code>request.socket.localPort
</code></pre>

blocks|key|806603|text|将旧样式转换为新(Express+3.x)样式的最简单方法如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|806604|var+server+=+app.listen(8080);
console.log('Listening+on+port:+'+%2B+server.address().port);|code-block|syntax|javascript|806605|在3.x之前，它是这样工作的：|806606|/*+This+no+longer+works+*/
app.listen(8080);
console.log('Listening+on+port:+'+%2B+app.address().port);|806607|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The simplest way to convert from the old style to the new (Express 3.x) style is like this:

<pre><code>var server = app.listen(8080);
console.log('Listening on port: ' + server.address().port);
</code></pre>

Pre 3.x it works like this:

<pre><code>/* This no longer works */
app.listen(8080);
console.log('Listening on port: ' + app.address().port);
</code></pre>

blocks|key|1021357|text|我也在问自己这个问题，然后我来Express+4.x+guide+page看了这个样本：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1021358|var+server+=+app.listen(3000,+function()+{
+++console.log('Listening+on+port+%25d',+server.address().port);
});|code-block|syntax|javascript|1021359|entityMap|0|LINK|mutability|MUTABLE|url|http://expressjs.com/guide.html^0|F|M|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

I was asking myself this question too, then I came <a href="http://expressjs.com/guide.html" rel="nofollow">Express 4.x guide page</a> to see this sample:

<pre><code>var server = app.listen(3000, function() {
 console.log('Listening on port %d', server.address().port);
});
</code></pre>

blocks|key|806712|text|我使用Express+4的方式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|806713|app.listen(1337,+function(){
++console.log('Express+listening+on+port',+this.address().port);
});|code-block|syntax|javascript|806714|通过使用它，我不需要为监听器/服务器使用单独的变量。|806715|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I use this way Express 4:

<pre><code>app.listen(1337, function(){
 console.log('Express listening on port', this.address().port);
});
</code></pre>

By using this I don't need to use a separate variable for the listener/server.

blocks|key|1021422|text|req.headers.host.split(':')[1]|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1021423|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>req.headers.host.split(':')[1]
</code></pre>

blocks|key|806761|text|下面是一个简单的http服务器，以及如何获取侦听端口|type|unstyled|depth|inlineStyleRanges|entityRanges|data|806762|var+http+=+require("http");
+++++++++++++function+onRequest(request,+response)+{
+++++++++++++++console.log("Request+received.");
+++++++++++++++response.writeHead(200,+{"Content-Type":+"text/plain"});
+++++++++++++++response.write("Hello+World");
+++++++++++++++response.end();
+++++++++++++}

+++++++++++++var+server+=http.createServer(onRequest).listen(process.env.PORT,+function(){
++++++++++++console.log('Listening+on+port+');+//Listening+on+port+8888
++++++++});|code-block|syntax|javascript|806763|然后使用以下命令获取服务器端口：|806764|console.log('Express+server+started+on+port+%25s',+server.address().port);|806765|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

below a simple http server and how to get the listening port

<pre><code>var http = require("http");
 function onRequest(request, response) {
 console.log("Request received.");
 response.writeHead(200, {"Content-Type": "text/plain"});
 response.write("Hello World");
 response.end();
 }

 var server =http.createServer(onRequest).listen(process.env.PORT, function(){
 console.log('Listening on port '); //Listening on port 8888
 });
</code></pre>

then get the server port by using :

<pre><code>console.log('Express server started on port %s', server.address().port);
</code></pre>

blocks|key|806819|text|更简单的方法是调用app.get('url')，它为您提供协议、子域、域和端口。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|806820|entityMap^0|9|E|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

The easier way is just to call <code>app.get('url')</code>, which gives you the protocol, sub domain, domain, and port.

blocks|key|1021508|text|您可以使用server.address().port获取端口号，如下代码所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1021509|var+http+=+require('http');
var+serverFunction+=+function+(req,+res)+{

++++if+(req.url+==+'/')+{
++++++++console.log('get+method');
++++++++res.writeHead(200,+{+'content-type':+'text/plain'+});
++++++++res.end('Hello+World');
++++}

}
var+server+=+http.createServer(serverFunction);
server.listen(3002,+function+()+{
++++console.log('server+is+listening+on+port:',+server.address().port);
});|code-block|syntax|javascript|1021510|entityMap^0|5|L|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You can get the port number by using <code>server.address().port</code>
like in below code:

<pre><code>var http = require('http');
var serverFunction = function (req, res) {

 if (req.url == '/') {
 console.log('get method');
 res.writeHead(200, { 'content-type': 'text/plain' });
 res.end('Hello World');
 }

}
var server = http.createServer(serverFunction);
server.listen(3002, function () {
 console.log('server is listening on port:', server.address().port);
});
</code></pre>

blocks|key|1021515|text|const+express+=+require('express');+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
const+morgan+=+require('morgan')
const+PORT+=+3000;

morgan.token('port',+(req)+=>+{+
++++return+req.app.locals.port;+
});

const+app+=+express();
app.locals.port+=+PORT;
app.use(morgan(':method+:url+:port'))
app.get('/app',+function(req,+res)+{
++++res.send("Hello+world+from+server");
});

app1.listen(PORT);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1021516|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>const express = require('express'); 
const morgan = require('morgan')
const PORT = 3000;

morgan.token('port', (req) =&gt; { 
 return req.app.locals.port; 
});

const app = express();
app.locals.port = PORT;
app.use(morgan(':method :url :port'))
app.get('/app', function(req, res) {
 res.send("Hello world from server");
});

app1.listen(PORT);
</code></pre>

blocks|key|806900|text|如果您没有定义端口号，并且想知道它在哪个端口上运行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|806901|let+http+=+require('http');
let+_http+=+http.createServer((req,+res)+=>+{
res.writeHead(200);
res.end('Hello..!')
}).listen();
console.log(_http.address().port);|code-block|syntax|javascript|806902|仅供参考，每次它都会在不同的端口上运行。|806903|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you did not define the port number and you want to know on which port it is running.

<pre><code>let http = require('http');
let _http = http.createServer((req, res) =&gt; {
res.writeHead(200);
res.end('Hello..!')
}).listen();
console.log(_http.address().port);
</code></pre>

FYI, every time it will run in a different port.

blocks|key|1021572|text|你可能在找process.env.PORT。这允许您使用所谓的“环境变量”动态设置侦听端口。Node.js代码将如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1021573|const+port+=+process.env.PORT+%7C%7C+3000;+
app.listen(port,+()+=>+{console.log(`Listening+on+port+${port}...`)});+|code-block|syntax|javascript|1021574|您甚至可以使用export+PORT=5000或您想要的任何端口在终端中手动设置动态变量。|1021575|entityMap^0|5|G|0|0|7|G|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

You might be looking for <code>process.env.PORT</code>. This allows you to dynamically set the listening port using what are called &quot;environment variables&quot;. The Node.js code would look like this:
<pre><code>const port = process.env.PORT || 3000; 
app.listen(port, () =&gt; {console.log(`Listening on port ${port}...`)}); 
</code></pre>
You can even manually set the dynamic variable in the terminal using <code>export PORT=5000</code>, or whatever port you want.

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:

<pre><code>console.log('Server is listening on port 8000');
</code></pre>

But ideally you'd want this instead:

<pre><code>console.log('Server is listening on port ' + server.port);
</code></pre>

How do I retrieve the port the server is currently listening on without storing the number in a variable prior to calling <code>server.listen()</code>?

I've seen this done before but I can't find it in the Node documentation. Maybe it's something specific to express?

NodeJS: How to get the server's port?

您经常会看到Node的示例hello world代码，它创建一个Http服务器，开始侦听一个端口，然后是类似以下内容的内容：console.log('Server is listening on port 8000');但理想情况下，你会想要这样：console.log('Server is listening on ...

问NodeJS:如何获取服务器的端口？
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