github.com/xushiwei/go@v0.0.0-20130601165731-2b9d83f45bc9/doc/articles/wiki/final-template.go (about) 1 // Copyright 2010 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package main 6 7 import ( 8 "html/template" 9 "io/ioutil" 10 "net/http" 11 ) 12 13 type Page struct { 14 Title string 15 Body []byte 16 } 17 18 func (p *Page) save() error { 19 filename := p.Title + ".txt" 20 return ioutil.WriteFile(filename, p.Body, 0600) 21 } 22 23 func loadPage(title string) (*Page, error) { 24 filename := title + ".txt" 25 body, err := ioutil.ReadFile(filename) 26 if err != nil { 27 return nil, err 28 } 29 return &Page{Title: title, Body: body}, nil 30 } 31 32 const lenPath = len("/view/") 33 34 func editHandler(w http.ResponseWriter, r *http.Request) { 35 title := r.URL.Path[lenPath:] 36 p, err := loadPage(title) 37 if err != nil { 38 p = &Page{Title: title} 39 } 40 renderTemplate(w, "edit", p) 41 } 42 43 func viewHandler(w http.ResponseWriter, r *http.Request) { 44 title := r.URL.Path[lenPath:] 45 p, _ := loadPage(title) 46 renderTemplate(w, "view", p) 47 } 48 49 func saveHandler(w http.ResponseWriter, r *http.Request) { 50 title := r.URL.Path[lenPath:] 51 body := r.FormValue("body") 52 p := &Page{Title: title, Body: []byte(body)} 53 p.save() 54 http.Redirect(w, r, "/view/"+title, http.StatusFound) 55 } 56 57 func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) { 58 t, _ := template.ParseFiles(tmpl + ".html") 59 t.Execute(w, p) 60 } 61 62 func main() { 63 http.HandleFunc("/view/", viewHandler) 64 http.HandleFunc("/edit/", editHandler) 65 http.HandleFunc("/save/", saveHandler) 66 http.ListenAndServe(":8080", nil) 67 }