udp客户端与服务端

package mainimport ("fmt""net""strings"
)func main() {conn, err := net.ListenUDP("udp", &net.UDPAddr{IP:   net.IPv4(127, 0, 0, 1),Port: 40000,})if err != nil {fmt.Println("listen udp faild err:", err)}defer conn.Close()//不需要建立连接，直接收发数据var data [1024]bytefor {n, addr, err := conn.ReadFromUDP(data[:])if err != nil {fmt.Println("read from UDP faild,err:", err)}fmt.Println(data[:n])reply := strings.ToUpper(string(data[:n]))//发送消息conn.WriteToUDP([]byte(reply), addr)}
}

package mainimport ("bufio""fmt""net""os"
)//udp client
func main() {socket, err := net.DialUDP("udp", nil, &net.UDPAddr{IP:   net.IPv4(127, 0, 0, 1),Port: 40000,})if err != nil {fmt.Println("连接服务端失败，err:", err)}defer socket.Close()var reply [1024]bytereader := bufio.NewReader(os.Stdin)for {fmt.Print("请输入内容：")msg, _ := reader.ReadString('\n')socket.Write([]byte(msg))// 收回复的数据n, _, err := socket.ReadFromUDP(reply[:])if err != nil {fmt.Println("redv reply msg failed,err:", err)return}fmt.Println("收到回复信息：", string(reply[:n]))}
}