Node.js socket.send()方法
原文:https://www.geeksforgeeks.org/node-js-socket-send-method/
socket.send() 方法是 dgram 模块内 socket 类的内置应用编程接口，用于将消息从一个 socket 发送到另一个 Socket。
语法:
socket.send(msg[, offset, length][, port][, address][, callback])
参数:该方法取以下参数:
- msg: message to be sent.
- Offset: The offset in the buffer where the message starts.
- Length: The number of bytes in the message.
- Port: Destination port.
- Address: The name or IP address of the destination host.
- Callback: Called after the message is sent.
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.send() 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 reference of the server
// by using ref() method
const size = server.ref();
// Display the result
console.log(size.eventNames());
});
// Client sending message to server
// by using send() method
client.send("Hello", 0, 7, 1234, "localhost");
输出:
[ 'message' ]
UDP String: Hello
示例 2: 文件名:index . js
Javascript
// Node.js program to demonstrate the
// server.send() 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, () => {
// Getting the reference of server
// by using ref() method
const size = server.ref();
// display the result
console.log(size.eventNames());
});
// Client sending message to server
// by using send() method
client.send("Hello", 0, 7, 1234, "localhost", (err) =>{
if(err) throw err;
console.log("message sent");
});
输出:
server listening 0.0.0.0:1234
[ 'message', 'listening' ]
message sent
UDP String: Hello
使用以下命令运行 index.js 文件:
node index.js
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