A TCP echo server demo.

tcp-echo-server-with-bufio.go

package main

import (
    "os"
    "fmt"
    "net"
    "bufio"
)

func handleConnection(conn net.Conn) {
    reader := bufio.NewReader(conn)
    writer := bufio.NewWriter(conn)

    for {
        line, err := reader.ReadString('\n')
        if err != nil {
            fmt.Printf("ReadString error: %s\n", err)
            conn.Close()
            break
        }

        fmt.Printf("[Client] %s", line)

        writer.WriteString("[Server] " + line)
        writer.Flush()
    }
}

func main() {
    ln, err := net.Listen("tcp", "127.0.0.1:4567")
    if err != nil {
        fmt.Printf("Listen error: %s\n", err)
        os.Exit(1)
    }

    for {
        fmt.Printf("Accepting new connections...\n")
        conn, err := ln.Accept()
        if err != nil {
            fmt.Printf("Accept error: %s\n", err)
            continue
        }

        go handleConnection(conn)
    }
}