Node.js http.server.listening用法及代码示例

http.server.listening是http模块中Server类的内置应用程序编程接口，用于检查服务器是否在侦听连接。

用法:

const server.listening

参数：它不接受任何参数作为参数。

返回值：它不返回任何值。

范例1： 文件名：index.js

Javascript

// Node.js program to demonstrate the   
// server.listening APi 
    
// 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 API 
  const value = response.socket; 
    
  // display result 
  // by using end() api 
  response.end( "socket buffersize:" 
  + value.bufferSize, 'utf8', () => {  
      console.log("displaying the result...");  
  
      // closing server  
      // by using close() api 
      httpServer.close(()=>{ 
          console.log("server is closed") 
      }) 
  });  
});  
    
// Listening to http Server  
// by using listen() api 
httpServer.listen(PORT, () => {  
    console.log("Server is running at port 3000...");  
}); 
  
// checking if the server is listening or not 
if(httpServer.listening) 
console.log("server is listening") 
else
console.log("server is not listening")

输出：

输出：In-Console

server is listening
Server is running at port 3000...
displaying the result...
displaying the result...
server is closed
server is closed

现在在浏览器中运行http：//localhost：3000 /。

输出：In-Browser

socket buffersize:0

范例2： 文件名：index.js

Javascript

// Node.js program to demonstrate the   
// server.listening APi 
    
// Importing http module  
var http = require('http');  
  
// Request and response handler  
const http2Handlers = (request, response) => {  
    
  // getting the reference of the 
  // underlying socket object 
  // by using socket API 
  const value = response.socket; 
    
  // display result 
  // by using end() api 
  response.end( "socket local address:" 
  + value.localAddress, 'utf8', () => {  
      console.log("displaying the result...");  
  
      // closing server  
      // by using close() api 
      httpServer.close(()=>{ 
          console.log("server is closed") 
      }) 
  }); 
  };  
    
// Listening to http Server  
// by using listen() api 
var httpServer = http.createServer( 
    http2Handlers).listen(3000, () => {  
    console.log("Server is running at port 3000...");  
});  
  
// checking if the server is listening or not 
if(httpServer.listening) 
console.log("server is listening") 
else
console.log("server is not listening")

输出：

输出：In-Console

server is listening
Server is running at port 3000...
displaying the result...
displaying the result...
server is closed
server is closed

现在在浏览器中运行http：//localhost：3000 /。

输出：In-Browser

socket local address:::1

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

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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.listening Property。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。