35 lines
615 B
Go
35 lines
615 B
Go
package main
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import (
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"fmt"
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"log"
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"net"
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"strings"
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)
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// UDP sever
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func main() {
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conn, err := net.ListenUDP("udp", &net.UDPAddr{
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IP: net.IPv4(127, 0, 0, 1),
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Port: 40000,
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})
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if err != nil {
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log.Fatal("listen udp failed:", err)
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return
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}
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defer conn.Close()
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//不需要建立链接，直接收发数据
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data := make([]byte, 1024)
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for {
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n, addr, err := conn.ReadFromUDP(data)
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if err != nil {
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log.Println("read from udp failed:", err)
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}
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fmt.Printf("%s\n", data[:n])
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reply := string(data[:n])
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reply = strings.ToUpper(reply)
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//发送数据
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conn.WriteToUDP([]byte(reply), addr)
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}
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}
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