Simple TCP Server in Go
Listens on port 8081 for a tcp connection. Once a connection has been made, the request data is read, printed to the console, and the string "Hello!" is returned as a response.
package main
import (
"net"
"fmt"
)
func handleConnection(conn net.Conn) {
// try to read data from the connection
data := make([]byte, 512)
n, err := conn.Read(data)
if err != nil { panic(err) }
s := string(data[:n])
// print the request data
fmt.Println(s)
// send a response
var str = []string{"Hi there!"}
var x = []byte{}
// convert string array to byte array so it can
// be written to the connection
for i:=0; i<len(str); i++{
b := []byte(str[i])
for j:=0; j<len(b); j++{
x = append(x,b[j])
}
}
// write the data to the connection
_, err = conn.Write(x)
if err != nil { panic(err) }
// close the connection
conn.Close()
}
func main() {
ln, err := net.Listen("tcp", ":8081")
if err != nil {
// handle error
}
for {
conn, err := ln.Accept()
if err != nil {
// handle error
continue
}
go handleConnection(conn)
}
}Written by Andrew Kennedy
Related protips
3 Responses
Instead of the double loop to convert the string array to a byte array, why not do:
// import "bytes"
var str = []string{"Hi there!"}
var buf bytes.Buffer
for _, s := range str {
buf.WriteString(s)
}
_, err = conn.Write(buf.Bytes())To simplify things further, you could import the "strings" library and call strings.Join() on the str array.
If net.Conn complies with the io.Reader interface, you could also use bytes.Buffer for reading from the connection. I don't think it does comply, however.
Thanks for the tips! I updated the code and put it in a gist here: https://gist.github.com/L1fescape/8888393
Just started learning Go last week, so all tips/suggestions are welcome!
I am starting learning dart too :) Thx. Ooops Dart with go! :D
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