Node.js socket.bind()方法
原文:https://www.geeksforgeeks.org/node-js-socket-bind-method/
socket.bind() 方法是 dgram 模块内 socket 类的内置应用编程接口，用于将特定的数据图服务器绑定到特定的端口，并提供一些所需的信息。
语法:
const socket.bind(options[, callback])
参数:该方法取以下参数:
- Option: The following parameters can be used-
- Port: Port value.
- Address: Address
- Exclusive: Boolean value is true or false.
- FD: An integer value.
- Callback: Callback function for further operation.
返回值:该方法返回包含套接字地址信息的对象。
示例 1: 文件名:index.js
java 描述语言
// Node.js program to demonstrate the
// server.bind() 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);
});
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");
输出:
{ address: '0.0.0.0', family: 'IPv4', port: 1234 }
UDP String: Hello
示例 2: 文件名:index . js
Javascript
// Node.js program to demonstrate the
// server.bind() 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');
});
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");
输出:
server listening 0.0.0.0:1234
UDP String: Hello
使用以下命令运行 index.js 文件:
node index.js
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