golang udp

/**
  golang udp
*/
package main

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

var p = fmt.Println

func server() {
	udpAddr, _ := net.ResolveUDPAddr("udp4", "0.0.0.0:7070")
	conn, e := net.ListenUDP("udp4", udpAddr)
	defer conn.Close()
	if e != nil {
		return
	}
	for {
		b := make([]byte, 4096)
		_, remoteAddr, e := conn.ReadFromUDP(b)
		if e != nil {
			continue
		}
		req := strings.TrimSpace(string(b))
		p("來之客戶端的數據:您輸入了>>"+req, remoteAddr)
	}
}

func main() {
	//server
	go server()
	//client
	tcpAddr, _ := net.ResolveUDPAddr("udp4", "127.0.0.1:7070")
	conn, e := net.DialUDP("udp4", nil, tcpAddr)
	defer func() {
		conn.Close()
	}()
	if e != nil {
		return
	}
	p("-----客戶端：請輸入.....")
	for {
		var input string
		fmt.Scanln(&input)
		conn.Write([]byte(input))
		if input == "exit" || input == "quit" {
			break
		}
	}

	time.Sleep(4 * time.Second)
}