view.html
<h1>www.golangweb.com</h1> <h1>{{.Title |html}}</h1> <div>{{printf "%s" .Body |html}}</div> <p>[<a href="/edit/{{.Title |html}}">edit</a>]</p>
edit.html
<h1>Editing {{.Title |html}}</h1>
<form action="/save/{{.Title |html}}" method="POST">
<div><textarea name="body" rows="20" cols="80">{{printf "%s" .Body |html}}</textarea></div>
<div><input type="submit" value="Save"></div>
</form>tt.txt
- shsussnahdadss
template.go
package main
import (
"fmt"
"html/template"
"io/ioutil"
"net/http"
"regexp"
)
type Page struct {
Title string
Body []byte
}
func (p *Page) save() string {
filename := p.Title + ".txt"
eer := ioutil.WriteFile(filename, p.Body, 0600)
if eer != nil {
return "err"
}
return ""
}
func loadPage(title string) (*Page, string) {
filename := title + ".txt"
body, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err.Error()
}
return &Page{Title: title, Body: body}, ""
}
// 查看数据
func viewHandler(w http.ResponseWriter, r *http.Request, title string) {
p, _ := loadPage(title)
if p == nil {
http.Redirect(w, r, "/edit/"+title, http.StatusFound)
return
}
renderTemplate(w, "view", p)
}
func editHandler(w http.ResponseWriter, r *http.Request, title string) {
p, err := loadPage(title)
if len(err) == 0 {
p = &Page{Title: title}
}
renderTemplate(w, "edit", p)
}
func saveHandler(w http.ResponseWriter, r *http.Request, title string) {
body := r.FormValue("body")
p := &Page{Title: title, Body: []byte(body)}
err := p.save()
if len(err) == 0 {
// http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/view/"+title, http.StatusFound)
}
// 保存全局的变量的数据
var templates map[string]*template.Template
// 初始化函数
func init() {
templates = make(map[string]*template.Template)
for _, tmpl := range []string{"edit", "view"} {
fmt.Println("sssss")
tt, err := template.ParseFiles(tmpl + ".html")
if err != nil {
fmt.Println("init err ", err.Error())
continue
}
t := template.Must(tt, nil)
templates[tmpl] = t
}
}
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
err := templates[tmpl].Execute(w, p)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
const lenPath = len("/view/")
var titleValidator = regexp.MustCompile("^[a-zA-Z0-9]+$")
func makeHandler(fn func(http.ResponseWriter, *http.Request, string)) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
if !titleValidator.MatchString(title) {
http.NotFound(w, r)
return
}
fn(w, r, title)
}
}
// 主函数
func main() {
http.HandleFunc("/view/", makeHandler(viewHandler))
http.HandleFunc("/edit/", makeHandler(editHandler))
http.HandleFunc("/save/", makeHandler(saveHandler))
http.ListenAndServe(":8080", nil)
}