go 1.16 embed demo

go1.16demo.go

package main

import (
	"embed"
	"fmt"
	"net/http"
	"strings"
)

var (
	Version string = strings.TrimSpace(version)
	//go:embed version.txt
	version string

	//go:embed version.txt
	version2 []byte

	//go:embed dir dir/home.html
	//go:embed img/*
	staticFS embed.FS
)

func main() {
	fmt.Printf("Version %q\n", Version)
	fmt.Printf("Version2 %q\n", string(version2))

	// 不支持 局部变量
	////go:embed version.txt
	//var v string
	//fmt.Printf("v %q\n", v)

	_, err := staticFS.ReadFile("img/cpu.png")
	if err !=nil {
		panic(err)
	}
	index, err := staticFS.ReadFile("dir/index.html")
	if err !=nil {
		panic(err)
	}
	fmt.Printf("dir/index.html %q\n", string(index))

	files, err := staticFS.ReadDir("dir")
	for _, file:=range files {
		fmt.Printf("file: %s\n", file.Name())
	}


	http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.FS(staticFS))))
	if err := http.ListenAndServe(":8080", nil); err !=nil {
		panic(err)
	}
}