go語言實現udp用戶端/服務端

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/ server.go /
package main

import (
"fmt"
"net"
"os"
)

func checkError(err error) {
if err != nil {
fmt.Println("Error: %s", err.Error())
os.Exit(1)
}
}

func recvUDPMsg(conn *net.UDPConn) {
var buf [20]byte

    n, raddr, err := conn.ReadFromUDP(buf[0:])    if err != nil {            return    }    fmt.Println("msg is ", string(buf[0:n]))    //WriteToUDP    //func (c *UDPConn) WriteToUDP(b []byte, addr *UDPAddr) (int, error)    _, err = conn.WriteToUDP([]byte("nice to see u"), raddr)    checkError(err)

}

func main() {
udp_addr, err := net.ResolveUDPAddr("udp", ":9098")
checkError(err)

    conn, err := net.ListenUDP("udp", udp_addr)    defer conn.Close()    checkError(err)    //go recvUDPMsg(conn)    for {            recvUDPMsg(conn)    }

}

/ client.go /
package main

import (
"fmt"
"net"
"os"
// "io"
)

func main() {
conn, err := net.Dial("udp", "127.0.0.1:9098")
defer conn.Close()
if err != nil {
os.Exit(1)
}

    conn.Write([]byte("Hello world!"))    fmt.Println("send msg")    var msg [20]byte    conn.Read(msg[0:])    fmt.Println("msg is", string(msg[0:10]))

}

go語言實現udp用戶端/服務端