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                ## UDP協議 UDP協議(User Datagram Protocol)中文名稱是用戶數據報協議,是OSI(Open System Interconnection,開放式系統互聯)參考模型中一種無連接的傳輸層協議,不需要建立連接就能直接進行數據發送和接收,屬于不可靠的、沒有時序的通信,但是UDP協議的實時性比較好,通常用于視頻直播相關領域 Go語言的net包實現的UDP服務端代碼如下: ~~~ // UDP server端 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[:]) // 接收數據 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) // 發送數據 if err != nil { fmt.Println("write to udp failed, err:", err) continue } } } ~~~ Go語言的net包實現的UDP客戶端代碼如下: ~~~ // UDP 客戶端 func main() { socket, err := net.DialUDP("udp", nil, &net.UDPAddr{ IP: net.IPv4(0, 0, 0, 0), Port: 30000, }) if err != nil { fmt.Println("連接服務端失敗,err:", err) return } defer socket.Close() sendData := []byte("Hello server") _, err = socket.Write(sendData) // 發送數據 if err != nil { fmt.Println("發送數據失敗,err:", err) return } data := make([]byte, 4096) n, remoteAddr, err := socket.ReadFromUDP(data) // 接收數據 if err != nil { fmt.Println("接收數據失敗,err:", err) return } fmt.Printf("recv:%v addr:%v count:%v\n", string(data[:n]), remoteAddr, n) } ~~~
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