Node.js socket.connect()方法
原文:https://www . geesforgeks . org/node-js-socket-connect-method/
socket.connect()方法是 dgram 模块中 socket 类的内置应用程序编程接口，用于将特定的服务器连接到特定的端口和地址。
语法:
const socket.connect(port[, address][, callback])
参数:此方法接受以下参数:
- Port: This parameter holds the port number.
- Address: This parameter stores the server address information.
- Callback: This parameter saves the callback function for further operation.
返回值:此方法不返回值。
示例 1: 文件名:index.js
java 描述语言
// Node.js program to demonstrate the
// server.connect() method
// Importing dgram module
var dgram = require('dgram');
// Creating and initializing client
// and server socket
var client = dgram.createSocket("udp4");
var server = dgram.createSocket("udp4");
// Catching the message event
server.on("message", function (msg) {
// Displaying the client message
process.stdout.write("UDP String: " + msg + "\n");
// Exiting process
process.exit();
})
// Binding server with port
.bind(1234, () => {
// Getting the address information
// for the server by using
// address method
const address = server.address()
// Display the result
console.log(address);
});
// Connecting the server with particular local host
// and address by using connect() method
server.connect(1234, "localhost", () => {
console.log("connected")
})
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");
输出:
{ address: '0.0.0.0', family: 'IPv4', port: 1234 }
connected
UDP String: Hello
示例 2: 文件名:index . js
Javascript
// Node.js program to demonstrate the
// server.connect() method
// Importing dgram module
var dgram = require('dgram');
// Creating and initializing client
// and server socket
var client = dgram.createSocket("udp4");
var server = dgram.createSocket("udp4");
// Catching the message event
server.on("message", function (msg) {
// Displaying the client message
process.stdout.write("UDP String: " + msg + "\n");
// Exiting process
process.exit();
});
// Catching the listening event
server.on('listening', () => {
// Getting address information for the server
const address = server.address();
// Display the result
console.log(`server listening
${address.address}:${address.port}`);
});
// Binding server with port address
// by using bind() method
server.bind(1234, () => {
// Adding a multicast address for others to join
server.addMembership('224.0.0.114');
});
// Connecting the server with particular local host
// and address by using connect() method
server.connect(1234, "localhost", () => {
console.log("connected")
})
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");
输出:
server listening 0.0.0.0:1234
connected
UDP String: Hello
使用以下命令运行 index.js 文件:
node index.js
参考:T2】https://nodejs . org/dist/latest-v 12 . x/docs/API/dgram . html # dgram _ socket _ connect _ port _ address _ callback
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