import (
"bufio"
"fmt"
"net"
"time"
)

func main() {
var tcpAddr *net.TCPAddr

    tcpAddr, _ = net.ResolveTCPAddr("tcp", "127.0.0.1:9999")

    tcpListener, _ := net.ListenTCP("tcp", tcpAddr)

    defer tcpListener.Close()

    for {
            tcpConn, err := tcpListener.AcceptTCP()
            if err != nil {
                    continue
            }

            fmt.Println("A client connected : " + tcpConn.RemoteAddr().String())
            go tcpPipe(tcpConn)
    }
 

}

func tcpPipe(conn *net.TCPConn) {
ipStr := conn.RemoteAddr().String()
defer func() {
fmt.Println("disconnected :" + ipStr)
conn.Close()
}()
reader := bufio.NewReader(conn)

    for {
            message, err := reader.ReadString(‘\n‘)
            if err != nil {
                    return
            }

            fmt.Println(string(message))
            msg := time.Now().String() + "\n"
            b := []byte(msg)
            conn.Write(b)
    }
 

}

/client.go /
package main

import (
"bufio"
"fmt"
"net"
"time"
)

var quitSemaphore chan bool

func main() {
var tcpAddr *net.TCPAddr
tcpAddr, _ = net.ResolveTCPAddr("tcp", "127.0.0.1:9999")

    conn, _ := net.DialTCP("tcp", nil, tcpAddr)
    defer conn.Close()
    fmt.Println("connected!")

    go onMessageRecived(conn)

    b := []byte("time\n")
    conn.Write(b)

    <-quitSemaphore
 

}

func onMessageRecived(conn *net.TCPConn) {
reader := bufio.NewReader(conn)
for {
msg, err := reader.ReadString(‘\n‘)
fmt.Println(msg)
if err != nil {
quitSemaphore <- true
break
}
time.Sleep(time.Second)
b := []byte(msg)
conn.Write(b)
}
}

go語言實現 tcp客戶端/服務端