如何检查NodeJS中的端口是否繁忙？ [英] How can I check if port is busy in NodeJS?

问题描述

如何检查端口是否正常 localhost ？

是有没有标准算法？我正在考虑向该网址发出 http 请求，并检查响应状态代码是否不是 404 。

Is there any standard algorithm? I am thinking at making a http request to that url and check if response status code is not 404.

推荐答案

您可以尝试启动服务器，无论是TCP还是HTTP，都没关系。然后你可以尝试开始监听端口，如果失败，检查错误代码是否为 EADDRINUSE 。

You could attempt to start a server, either TCP or HTTP, it doesn't matter. Then you could try to start listening on a port, and if it fails, check if the error code is EADDRINUSE.

var net = require('net');
var server = net.createServer();

server.once('error', function(err) {
  if (err.code === 'EADDRINUSE') {
    // port is currently in use
  }
});

server.once('listening', function() {
  // close the server if listening doesn't fail
  server.close();
});

server.listen(/* put the port to check here */);

使用一次性事件处理程序，您可以将其包装成异步检查函数。

With the single-use event handlers, you could wrap this into an asynchronous check function.

这篇关于如何检查NodeJS中的端口是否繁忙？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！