Node.js http.server.listen()用法及代码示例

http.server.listen()是http模块中的Server类的内置应用程序编程接口，用于启动服务器接受新连接。

用法:

const server.listen(options[, callback])

参数：此方法接受以下两个参数：

option:根据用户需要，它可以是端口，主机，路径，积压，独占，readAll，writableAll，ipv6Only等。
callback:它是一个可选参数，它是作为参数传递的回调函数。

返回值：此方法只返回回调函数。

范例1：Filename-index.js

Javascript

// 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 /，您将在屏幕上看到以下输出：

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 /，您将在屏幕上看到以下输出：

socket local address:::1

参考：https://nodejs.org/dist/latest-v12.x/docs/api/http.html#http_server_listen

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 Node.js http.server.listen() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。