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  }