udp server

# Node.js

const dgram = require("dgram");
const server = dgram.createSocket("udp4");

server.on("error", (err) => {
  console.error(err);
  server.close();
});

server.on("message", (msg, rinfo) => {
  const data = msg.toString("utf8").trim();
  console.log(`received: ${data} from ${rinfo.address}:${rinfo.port}`);
});

server.on("listening", () => {
  const address = server.address();
  console.log(`server listening ${address.address}:${address.port}`);
});

server.bind(3000);

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Output

$ echo 'hello world' > /dev/udp/0.0.0.0/3000

server listening 0.0.0.0:3000
received: hello world from 127.0.0.1:51452

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# Go

package main

import (
	"fmt"
	"net"
	"strings"
)

func main() {
	conn, err := net.ListenUDP("udp", &net.UDPAddr{
		Port: 3000,
		IP:   net.ParseIP("0.0.0.0"),
	})
	if err != nil {
		panic(err)
	}

	defer conn.Close()
	fmt.Printf("server listening %s\n", conn.LocalAddr().String())

	for {
		message := make([]byte, 20)
		rlen, remote, err := conn.ReadFromUDP(message[:])
		if err != nil {
			panic(err)
		}

		data := strings.TrimSpace(string(message[:rlen]))
		fmt.Printf("received: %s from %s\n", data, remote)
	}
}

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Output

$ echo 'hello world' > /dev/udp/0.0.0.0/3000

server listening [::]:3000
received: hello world from 127.0.0.1:50275

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编辑

#Go #Node.js

上次更新: 2022/09/30, 11:34:22

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