udp编程

server

package main

import (
    "fmt"
    "net"
)

func main() {
    listener, err := net.ListenUDP("udp", &net.UDPAddr{
        IP:   net.IPv4(0, 0, 0, 0),
        Port: 30000,
    })
    if err != nil {
        fmt.Println("启动server失败,err", err)
        return
    }
    defer listener.Close()
    for {
        var buf [1024]byte
        n, addr, err := listener.ReadFromUDP(buf[:])
        if err != nil {
            fmt.Println("接受消息失败:err:", err)
            return
        }
        fmt.Printf("接受到来自%v的消息%v\n", addr, string(buf[:n]))
        n, err = listener.WriteTo([]byte("今晚来我房间"), addr)
        if err != nil{
            return
        }

    }
}

client

package main

import (
    "fmt"
    "net"
)

func main() {
    conn, err := net.Dial("udp", "127.0.0.1:30000")
    if err != nil {
        fmt.Println("连接server失败,err", err)
        return
    }
    defer conn.Close()
    n, err := conn.Write([]byte("今晚约么"))
    if err != nil {
        fmt.Println("发送消息失败: err", err)
        return
    }
    var buf = make([]byte, 1024)
    n, err = conn.Read(buf)
    if err != nil {
        fmt.Println("读取消息失败:err", err)
        return
    }
    fmt.Println(string(buf[:n]))
}

来自为知笔记(Wiz)