tmitz/effectivego_webserver.go

## effectivego_webserver.go
package main

import (
	"flag"
	"html/template"
	"log"
	"net/http"
)

const (
	tpl = `
<!DOCTYPE html>
<html>
<head>
<title>QR Link Generator</title>
</head>
<body>
<img src="http://chart.apis.google.com/chart?chs=300x300&cht=qr&choe=UTF-8&chl={{.}}" />
<br>
{{.}}
<br>
<br>
<form action="/" name="f" method="GET">
<input maxLength="1024" size="70" name="s" value="" title="Text to QR Encode">
<input type="submit" value="Show QR" name="qr">
</form>
</body>
</html>`
)

var (
	addr = flag.String("addr", ":1718", "http service address")
	t    = template.Must(template.New("master").Parse(tpl))
)

func QR(w http.ResponseWriter, req *http.Request) {
	t.Execute(w, req.FormValue("s"))
}

func check(err error) {
	if err != nil {
		log.Fatal(err)
	}
}

func main() {
	flag.Parse()
	http.HandleFunc("/", QR)
	err := http.ListenAndServe(*addr, nil)
	check(err)
}
	package main

	import (
	"flag"
	"html/template"
	"log"
	"net/http"
	)

	const (
	tpl = `
	<!DOCTYPE html>
	<html>
	<head>
	<title>QR Link Generator</title>
	</head>
	<body>
	<img src="http://chart.apis.google.com/chart?chs=300x300&cht=qr&choe=UTF-8&chl={{.}}" />
	<br>
	{{.}}
	<br>
	<br>
	<form action="/" name="f" method="GET">
	<input maxLength="1024" size="70" name="s" value="" title="Text to QR Encode">
	<input type="submit" value="Show QR" name="qr">
	</form>
	</body>
	</html>`
	)

	var (
	addr = flag.String("addr", ":1718", "http service address")
	t = template.Must(template.New("master").Parse(tpl))
	)

	func QR(w http.ResponseWriter, req *http.Request) {
	t.Execute(w, req.FormValue("s"))
	}

	func check(err error) {
	if err != nil {
	log.Fatal(err)
	}
	}

	func main() {
	flag.Parse()
	http.HandleFunc("/", QR)
	err := http.ListenAndServe(*addr, nil)
	check(err)
	}