go语言实现 tcp客户端/服务端

/ server.go /
package main

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)
}
}