Go语言开发Web程序-优快云博客

本文链接：https://blog.youkuaiyun.com/yupengfeiwangcui/article/details/115086707

该博客介绍了如何使用Go语言实现一个简单的Wiki系统，包括编辑、保存和查看功能。通过示例展示了模板文件view.html和edit.html的内容，以及主要的wiki.go代码，实现了页面的加载、编辑和保存操作。这个系统可以快速启动并在本地运行，代码量相较于Java更少，适合轻量级应用。

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Go语言实现编辑、保存、查看，代码量比Java少很多，确实不错

将以下文件放到同一个目录，运行 go run wiki.go 启动web程序，打开浏览器 http://localhost:8080/edit/test 即可看到效果

1、模板文件view.html

<h1>{{.Title}}</h1>

<p>[<a href="/edit/{{.Title}}">edit</a>]</p>

<div>{{printf "%s" .Body}}</div>

2、模板文件edit.html

<h1>Editing {{.Title}}</h1>

<form action="/save/{{.Title}}" method="POST">
<div><textarea name="body" rows="20" cols="80">{{printf "%s" .Body}}</textarea></div>
<div><input type="submit" value="Save"></div>
</form>

3、wiki.go

package main

import (
	"errors"
	"html/template"
	"io/ioutil"
	"log"
	"net/http"
	"regexp"
)

type Page struct {
	Title string
	Body  []byte
}

var templates = template.Must(template.ParseFiles("edit.html", "view.html"))

var validPath = regexp.MustCompile("^/(edit|save|view)/([a-zA-Z0-9]+)$")

func (p *Page) save() error {
	filename := p.Title + ".txt"
	return ioutil.WriteFile(filename, p.Body, 0600)
}
func loadPage(title string) (*Page, error) {
	filename := title + ".txt"
	body, err := ioutil.ReadFile(filename)
	if err != nil {
		return nil, err
	}
	return &Page{Title: title, Body: body}, nil
}

func viewHandler(w http.ResponseWriter, r *http.Request, title string) {
	p, err := loadPage(title)
	if err != nil {
		http.Redirect(w, r, "/edit/"+title, http.StatusNotFound)
		return
	}
	renderTemplate(w, "view", p)
}

func editHandler(w http.ResponseWriter, r *http.Request, title string) {
	p, err := loadPage(title)
	if err != nil {
		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 err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	http.Redirect(w, r, "/view/"+title, http.StatusFound)

}
func renderTemplate(w http.ResponseWriter, tmp1 string, p *Page) {
	err := templates.ExecuteTemplate(w, tmp1+".html", p)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func getTitle(w http.ResponseWriter, r *http.Request) (string, error) {
	m := validPath.FindStringSubmatch(r.URL.Path)
	if m == nil {
		http.NotFound(w, r)
		return "", errors.New("invalid Page Title")
	}
	return m[2], nil
}

func makeHandler(fn func(http.ResponseWriter, *http.Request, string)) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		m := validPath.FindStringSubmatch((r.URL.Path))
		if m == nil {
			http.NotFound(w, r)
			return
		}
		fn(w, r, m[2])
	}
}

func main() {
	http.HandleFunc("/view/", makeHandler(viewHandler))
	http.HandleFunc("/edit/", makeHandler(editHandler))
	http.HandleFunc("/save/", makeHandler(saveHandler))
	log.Fatal(http.ListenAndServe(":8080", nil))
}