package main
import(
"fmt"
"net"
"os"
"strings"
)
func main() {
arguments := os.Args
if len(arguments == 1) {
fmt.Println("Please provide a port number!")
return
}
SERVER := "localhost" + ":" + arguments[1]
s, err := net.ResolveTCPAddr("tcp", SERVER)
if err != nil {
fmt.Println(err)
return
}
l, err := net.ListenTCP("tcp", s)
if err != nil {
fmt.Println(err)
return
}
buffer := make([]byte, 1024)
conn, err := l.Accept()
if err != nil {
fmt.Println(err)
return
}
for {
n, err := conn.Read(buffer)
if err != nil {
fmt.Println(err)
return
}
if strings.TrimSpace(string(buffer[0:n]) == "STOP") {
fmt.Println("Exiting TCP server!")
conn.Close()
return
}
fmt.Print("> ", string(buffer[0:n-1]))
_, err = conn.Write(buffer)
if err != nil {
fmt.Println(err)
return
}
}
}
$ go run otherTCPserver.go 8001
> 1
> 2
> Hello!
> Exiting TCP server!
$ go run otherTCPclient.go localhost:8001
>> 1
->: 1
>> 2
->: 2
>> Hello!
->: Hello!
>> ->:
>> STOP
->: TCP client exiting...
最后,我将演示一个方法,用来在 Unix 机器上找到监听给定 TCP 或 UDP 端口的进程名。如果您想知道是哪个进程使用了 8001 的 TCP 端口号,您可以执行如下命令:
$ sudo lsof -n -i :8001
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
TCPserver 87775 mtsouk 3u IPv6 0x98d55014e6c9360f 0t0 TCP *:vcom-tunnel