我正在按照本教程进行学习: golang教程- Wiki,并且我设法使除“其他任务”部分中的最后一点之外的所有内容都起作用。我对本教程的实现:
package main import ( "fmt" "io/ioutil" "net/http" "html/template" "regexp" ) type Page struct { Title string Body []byte } func (p *Page) save() error { filename := "data/" + p.Title + ".txt" return ioutil.WriteFile(filename, p.Body, 0600) } func loadPage(title string) (*Page, error) { filename := "data/" + title + ".txt" body, err := ioutil.ReadFile(filename) if err != nil { return nil, err } return &Page{Title: title, Body: body}, nil } func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) { t, _ := template.ParseFiles("template/" + tmpl + ".html"); t.Execute(w, p) } func viewHandler(w http.ResponseWriter, r *http.Request) { title := r.URL.Path[len("/view/"):] p, err := loadPage(title) if err != nil { http.Redirect(w, r, "/edit/" + title, http.StatusFound); return } expr := regexp.MustCompile(`\[.+\]`) p.Body = expr.ReplaceAllFunc(p.Body, func ( match []byte) []byte { return []byte("<a href='/view/" + string(match) + "'>" + string(match) + "</a>") }) renderTemplate(w, "view", p); } func saveHandler(w http.ResponseWriter, r *http.Request) { title := r.URL.Path[len("/save/"):] body := r.FormValue("body") p := &Page{Title: title, Body: []byte(body)} p.save() http.Redirect(w, r, "/view/" + title, http.StatusFound) } func editHandler(w http.ResponseWriter, r *http.Request) { title := r.URL.Path[len("/edit/"):] p, err := loadPage(title); if err != nil { p = &Page{Title: title} } renderTemplate(w, "edit", p); } func main() { http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { http.Redirect(w, r, "/view/index", http.StatusFound) }) http.HandleFunc("/view/", viewHandler) http.HandleFunc("/edit/", editHandler) http.HandleFunc("/save/", saveHandler) http.ListenAndServe(":8080", nil) fmt.Println("Running"); }
html / template引擎会按预期方式打印定位标记,但会使用html实体对其进行转义。我还没有找到合适的方法。
使用template.HTML将正文标记为安全HTML。
以下函数将正文转换为HTML。
// Move to package-level variable so that it's compile once. var linkPat = regexp.MustCompile(`\[.+\]`) func toHTML(s string) template.HTML { // Escape everything in the string first to ensure that // special characters ('<' for example) are displayed as // characters and not treated as markup. s = template.HTMLEscapeString(s) // Insert the links. s = linkPat.ReplaceAllStringFunc(s, func(m string) string { s = s[1 : len(s)-1] return "<a href='/view/" + m + "'>" + m + "</a>" }) return template.HTML(s) }
使用以下方式渲染页面:
renderTemplate(w, "edit", map[string]interface{}{ "Title": p.Body, "Body": toHTML(p.Body), })