Node.js socket.connect()用法及代碼示例

socket.connect()方法是dgram模塊中Socket類的內置應用程序編程接口，用於將特定服務器連接到特定端口和地址。

用法:

const socket.connect(port[, address][, callback])

參數：此方法接受以下參數：

port:此參數保存端口號。
address:此參數保存服務器地址信息。
callback:此參數保存回調函數以供進一步操作。

返回值：此方法不返回任何值。

範例1： 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 clinet 
// 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");

輸出：

{ address:'0.0.0.0', family:'IPv4', port:1234 }
connected
UDP String:Hello

範例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 clinet 
// 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");

輸出：

server listening 0.0.0.0:1234
connected
UDP String:Hello

使用以下命令運行index.js文件：

node index.js

參考： https://nodejs.org/dist/latest-v12.x/docs/api/dgram.html#dgram_socket_connect_port_address_callback

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Node.js socket.connect() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。