node . js http . server . listing 属性
原文:https://www . geesforgeks . org/node-js-http-server-listening-property/
http . server . listing是 http 模块内类 Server 的内置应用编程接口，用于检查服务器是否在监听连接。
语法:
const server.listening
参数:不接受任何参数作为参数。
返回值:不返回值。
示例 1: 文件名:index.js
java 描述语言
// 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:控制台内
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/即可。
输出:浏览器内
socket buffersize : 0
示例 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:控制台内
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/即可。
输出:浏览器内
socket local address : ::1
参考:https://nodejs . org/dist/latest-v 12 . x/docs/API/http . html # http _ server _ listing
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