Node.js http.server.listen()方法
原文:https://www . geesforgeks . org/node-js-http-server-listen-method/
http.server.listen() 是 http 模块内类 server 的内置应用编程接口，用于启动服务器接受新的连接。
语法:
const server.listen(options[, callback])
参数:该方法接受以下两个参数:
- Option: It can be port, host, path, backlog, exclusive, readableAll, writableAll, ipv6Only, etc. according to user's needs.
- Callback: is an optional parameter and a callback function passed as a parameter.
返回值:这个方法只返回一个回调函数。
示例 1: Filename-index.js
java 描述语言
// Node.js program to demonstrate the
// server.listen() method
// Importing http module
var http = require('http');
// Setting up PORT
const PORT = process.env.PORT || 3000;
// Creating http Server
var httpServer = http.createServer(
function (request, response) {
// Getting the reference of the
// underlying socket object
// by using socket method
const value = response.socket;
// Display result
// by using end() method
response.end("socket buffersize : "
+ value.bufferSize, 'utf8', () => {
console.log("displaying the result...");
// Closing server
// by using close() method
httpServer.close(() => {
console.log("server is closed")
})
});
});
// Listening to http Server
// by using listen() method
httpServer.listen(PORT, () => {
console.log("Server is running at port 3000...");
});
使用以下命令运行 index.js 文件:
node index.js
输出:
Server is running at port 3000...
displaying the result...
server is closed
现在在浏览器中运行 http://localhost:3000/ ，你会在屏幕上看到如下输出:
socket buffersize : 0
示例 2:Filename-index . js
Javascript
// Node.js program to demonstrate the
// server.listen() method
// Importing http module
var http = require('http');
// Request and response handler
const httpHandlers = (request, response) => {
// Getting the reference of the
// underlying socket object
// by using socket method
const value = response.socket;
// Display result by using end() method
response.end("socket local address : "
+ value.localAddress, 'utf8', () => {
console.log("displaying the result...");
// Closing server by using close() method
httpServer.close(() => {
console.log("server is closed")
})
});
};
// Listening to http Server
// by using listen() method
var httpServer = http.createServer(
httpHandlers).listen(3000, () => {
console.log("Server is running at port 3000...");
});
使用以下命令运行 index.js 文件:
node index.js
输出:
Server is running at port 3000...
displaying the result...
server is closed
现在在浏览器中运行 http://localhost:3000/ ，你会在屏幕上看到如下输出:
socket local address : ::1
参考:https://nodejs . org/dist/latest-v 12 . x/docs/API/http . html # http _ server _ listen
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