前言

同TCP通信类似，也需要用到原生包 net 来实现udp接口，同样分为客户端和服务端

客户端代码

package main

import (
    "fmt"
    "net"
)

func main() {
    conn, err := net.DialUDP("udp", nil, &net.UDPAddr{
        IP:   net.IPv4(127, 0, 0, 1),
        Port: 9090,
    })

    if err != nil{
        fmt.Printf("connect failed, err: %v\n", err)
        return
    }

    for i:=0; i<100;i++{
        _,err = conn.Write([]byte("Hello Server!"))
        if err!=nil{
            fmt.Printf("send data failed,err: %v\n", err)
            return
        }
        result :=make([]byte,1024)
        n, remoteAddr,err :=conn.ReadFromUDP(result)
        if err!=nil{
            fmt.Printf("receive data failed, err: %v\n",err)
        }
        fmt.Printf("receive from addr:%v data %v\n",remoteAddr,string(result[:n]))
    }
}

服务端代码

package main

import (
    "fmt"
    "net"
)

func main() {
    listen, err := net.ListenUDP("udp", &net.UDPAddr{
        IP:   net.IPv4(0, 0, 0, 0),
        Port: 9090,
    })
    if err != nil {
        fmt.Printf("Listen failed, err: %v\n", err)
    }

    for {
        var data [1024]byte
        n, addr, err := listen.ReadFromUDP(data[:])
        if err != nil {
            fmt.Printf("Read failed from addr: %v ,err: %v\n", addr, err)
            break
        }
        go func() {
            fmt.Printf("addr: %v data: %v count: %v\n", addr, string(data[:n]), n)
            _, err = listen.WriteToUDP([]byte("received success!"), addr)
            if err != nil {
                fmt.Printf("write failed,err: %v\n", err)
            }
        }()
    }
}

实现效果