go_tcp-server.go

package main

import (
	"fmt"
	"io"
	"net"
)

// Test with TCP clients:
// $ echo "heyo" | nc localhost 9000
// $ telnet localhost 9000

func main() {
	// listen for incoming requests on specified port
	listener, err := net.Listen("tcp", ":9000")
	if err != nil {
		fmt.Println("error starting tcp server")
	}
	defer listener.Close()

	// infinite loop to keep accepting new TCP clients
	for {
		// Accept returns the next connection to the listener
		// conn implements both io.Reader/io.Writer interfaces
		conn, err := listener.Accept()
		if err != nil {
			fmt.Println("error accepting requests")
		}
		io.WriteString(conn, fmt.Sprintf("Handling request from %s...", conn.RemoteAddr().String()))
		// or go handle(conn) to handle concurrently

		conn.Close()
	}
}