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GoでWebアプリケーション#2

Posted at

やったこと

HTMLテンプレートファイルを読み込ませてブラウザ上で表示

ソース

package main

import (
	"html/template"
	"log"
	"net/http"
	"path/filepath"
	"sync"
)

type templateHandler struct {
	once     sync.Once
	filename string
	templ   *template.Template
}

// HTTPリクエストの処理
func (t *templateHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	t.once.Do(func() {
		t.templ =
			template.Must(template.ParseFiles(filepath.Join("templates",
				t.filename)))
	})
	t.templ.Execute(w, nil)
}

func main() {
	http.Handle("/", &templateHandler{
		filename: "chat.html"})
	//Webサーバーの開始
	if err := http.ListenAndServe(":8081", nil); err != nil {
		log.Fatal("ListenerAndServe:", err)
	}
}

実行結果

image.png

参考

オライリー 「Go言語によるアプリケーション開発」

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