Bagaimana untuk melaksanakan komunikasi UDP menggunakan fungsi pengaturcaraan rangkaian dalam bahasa Go?

import (
    "fmt"
    "net"
)

func main() {
    // 监听IP地址和端口号
    addr := net.UDPAddr{
        IP:   net.IPv4(0, 0, 0, 0),
        Port: 8888,
    }

    // 创建UDP socket
    conn, err := net.ListenUDP("udp", &addr)
    if err != nil {
        fmt.Println("Error listening:", err)
        return
    }
    defer conn.Close()

    fmt.Println("Server is listening on", addr.String())

    // 读取数据
    buffer := make([]byte, 1024)
    n, remoteAddr, err := conn.ReadFromUDP(buffer)
    if err != nil {
        fmt.Println("Error reading:", err)
        return
    }

    fmt.Println("Received message:", string(buffer[:n]), "from", remoteAddr)

    // 发送数据
    message := []byte("Hello, client!")
    _, err = conn.WriteToUDP(message, remoteAddr)
    if err != nil {
        fmt.Println("Error sending:", err)
        return
    }

    fmt.Println("Message sent")
}

import (
    "fmt"
    "net"
)

func main() {
    serverAddr := "127.0.0.1:8888"
    localAddr := "127.0.0.1:0"

    // 解析服务器地址
    udpAddr, err := net.ResolveUDPAddr("udp", serverAddr)
    if err != nil {
        fmt.Println("Error resolving server address:", err)
        return
    }

    // 解析本地地址
    localUdpAddr, err := net.ResolveUDPAddr("udp", localAddr)
    if err != nil {
        fmt.Println("Error resolving local address:", err)
        return
    }

    // 创建UDP socket
    conn, err := net.DialUDP("udp", localUdpAddr, udpAddr)
    if err != nil {
        fmt.Println("Error dialing server:", err)
        return
    }
    defer conn.Close()

    fmt.Println("Connected to", serverAddr)

    // 发送数据
    message := []byte("Hello, server!")
    _, err = conn.Write(message)
    if err != nil {
        fmt.Println("Error sending:", err)
        return
    }

    // 接收数据
    buffer := make([]byte, 1024)
    n, err := conn.Read(buffer)
    if err != nil {
        fmt.Println("Error reading:", err)
        return
    }

    fmt.Println("Received message:", string(buffer[:n]))
}