go语言之UDP通信

服务端

package main
 
import (
    "fmt"
    "net"
)
 
func main() {
    listen, err := net.ListenUDP("udp", &net.UDPAddr{
        IP:   net.IPv4(0, 0, 0, 0),
        Port: 30000,
    })
    if err != nil {
        fmt.Println("listen failed, err:", err)
        return
    }
    defer listen.Close()
    for {
        var data [1024]byte
        n, addr, err := listen.ReadFromUDP(data[:]) // 接收数据
        if err != nil {
            fmt.Println("read udp failed, err:", err)
            continue
        }
        fmt.Printf("data:%v addr:%v count:%v\n", string(data[:n]), addr, n)
        _, err = listen.WriteToUDP(data[:n], addr) // 发送数据
        if err != nil {
            fmt.Println("write to udp failed, err:", err)
            continue
        }
    }
}

　　客户端

package main
 
import (
    "fmt"
    "net"
)
 
func main() {
    socket, err := net.DialUDP("udp", nil, &net.UDPAddr{
        IP:   net.IPv4(0, 0, 0, 0),
        Port: 30000,
    })
    if err != nil {
        fmt.Println("连接服务端失败，err:", err)
        return
    }
    defer socket.Close()
    sendData := []byte("Hello server")
    _, err = socket.Write(sendData) // 发送数据
    if err != nil {
        fmt.Println("发送数据失败，err:", err)
        return
    }
    data := make([]byte, 4096)
    n, remoteAddr, err := socket.ReadFromUDP(data) // 接收数据
    if err != nil {
        fmt.Println("接收数据失败，err:", err)
        return
    }
    fmt.Printf("recv:%v addr:%v count:%v\n", string(data[:n]), remoteAddr, n)
}