Advanced Techniques in Go Programming/

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Developing a TCP Server That Uses net.ListenTCP()

Developing a TCP Server That Uses net.ListenTCP()

Let’s learn how to develop a TCP server that uses the net.ListenTCP() function.

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This time, this alternative version of the TCP server implements the echo service. Put simply, the TCP server sends back to the client the data that was received by the client.

Coding example

The code of otherTCPserver.go is as follows:

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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
	}

The above code gets the TCP port number value as a command-line argument, which is used in net.ResolveTCPAddr()—this is required to ...