gistfile1.go

package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"strings"
)

type Page struct {
	Title string
	Body  []byte
}

var normalizer = strings.NewReplacer(
	" ", "_",
)

func (p *Page) save() error {
	filename := normalizer.Replace(p.Title) + ".txt"
	return ioutil.WriteFile(filename, p.Body, 0600)
}

func loadPage(title string) (*Page, error) {
	filename := normalizer.Replace(title) + ".txt"
	body, err := ioutil.ReadFile(filename)
	if err != nil {
		return nil, err
	}
	return &Page{Title: title, Body: body}, nil
}
func main() {
	res, err := http.Get("http://www.google.com/robots.txt")
	if err != nil {
		log.Fatal(err)
	}
	robots, err := ioutil.ReadAll(res.Body)
	res.Body.Close()
	if err != nil {
		log.Fatal(err)
	}
	p1 := &Page{Title: "Google Robots", Body: robots}
	p1.save()
	p2, _ := loadPage("Google Robots")
	fmt.Println(string(p2.Body))
}