An article to talk about the net module in Node

When learning, Whenever I have time to read English documents, I try to read English documents. I have insisted on this for half a year. I couldn't stand it at the beginning, but now I can endure the discomfort and read it. The progress has been obvious in half a year. And this kind of Discomfort is a good thing, it means that this is not your comfort zone. After all, the courage to cross your comfort zone is the source of progress

Next, let’s get to the point. Since you want to learn communication, then We need two objects to simulate the client and server. Create two files client.jsandservice.jsrespectively. Create them through the command line:

touch client.js && touch service.js

3.1 service.js part

Introduces thenetmodule, and puts the server into theLISTENTstate, and configures the port number and HOST address (manually Skip the DNS resolution process) and wait for the client's call

const net = require("net"); const post = 3306; const host = "127.0.0.1"; const server = net.createServer(); server.listen(post, host);

At this time, the server corresponds to the TCP connection serverLISTENstatus.

Then monitor some necessary events, and It is the hook provided by the server. (Belongs to event-related knowledge)

server.on("listening", () => { console.log("服务器已经可以连接啦"); }); server.on("connection", (socket) => { console.log("有客户端来访咯"); }); server.on("close", () => { console.log("服务器关闭了"); }); server.on("error", (error) => { console.log("服务器出错啦: ", error); // error 有错误的信息 });

The above string of codes involves,

• listening: Events triggered after listening to the port
• connection: The event is triggered when a client visits
• close: The event is triggered when the server is closed
• error: Server error trigger

Forclosewe need to note that the background brother usually directly

ps kill -9 pid

kills the thread.

InconnectionGouzi, the formal parameter is the socket name. Its Chinese translation is a nested word, which is encapsulated into a stream by node. It can be roughly understood as The data sent by the client. This is the data itself has its own method. I processsocketinconnection

server.on("connection", (socket) => { console.log("有客户端来访咯"); socket.on("data", (data) => { console.log(data); // 客户端发送过来的数据 }); });

stream later The article will introduce it.

Since the server can accept the data sent by the client, it can naturally reply to the client. Write insocket.on(of course It can also be written outside):

socket.write("我已经收到你的服务器了哦,客户端");

At this time, if the client has completed accepting the data and then closed the connection. We can also passsocket.on('close')The hook listens to:

socket.on("close", () => { console.log("客户端把另外一头的流给关了"); });

The summary ofsocketevents is put intoclient.js. At this time, all the contents ofservice.jsare as follows:

const net = require("net"); const post = 3306; const host = "127.0.0.1"; const server = net.createServer(); server.listen(post, host); server.on("listening", () => { console.log("服务器已经可以连接啦"); }); server.on("connection", (socket) => { console.log("有客户端来访咯"); socket.on("data", (data) => { console.log(data); // 客户端发送过来的数据 socket.write("我已经收到你的服务器了哦,客户端"); }); socket.on("close", () => { console.log("客户端把另外一头的流给关了"); server.close(); // 客户端已经不要数据了,那么我们就把服务器给关闭了吧 }); }); server.on("close", () => { console.log("服务器关闭了"); }); server.on("error", (error) => { console.log("服务器出错啦: ", error); // error 有错误的信息 });

3.2 client.js part

The client side is much simpler.

const net = require("net"); const post = 3306; const host = "127.0.0.1"; const socket = net.connect(post, host); socket.on("connect", () => { console.log("已经连接到服务器了哦"); }); socket.write("服务器, 我来了"); socket.on("data", (data) => { console.log(data.toString()); socket.end(); }); socket.on("close", () => { console.log("连接已关闭了"); });

Summary of events forsocket

• connect: Triggered by successful connection to the server
• data: Receive parameters sent from the server
• end: Trigger after data reception is completed
• close: Trigger when socket is closed
## The

#service.jsandclient.jsframeworks have been written. Open two terminals and run them:

node service.js node client.js

This article is reproduced from: https://juejin.cn/post/7084618854801866765

Author: I am Little Orange

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