Go语言实现简单的留言本

发布时间：2020-12-16 18:45:41 所属栏目：大数据来源：网络整理

导读：做了个简单的留言本用来练习http与template. 主Go代码: package main//Golang版本的留言本//author:Xiong Chuan Liang//date:2015-3-2import ("fmt""html/template""io/ioutil""net/http""os""log")func main() {http.Handle("/images/",http.FileServer(htt

做了个简单的留言本用来练习http与template.

主Go代码:

package main

//Golang版本的留言本
//author:Xiong Chuan Liang
//date:2015-3-2

import (
	"fmt"
	"html/template"
	"io/ioutil"
	"net/http"
	"os"
	"log"
)

func main() {
	http.Handle("/images/",http.FileServer(http.Dir("asset")))

	http.HandleFunc("/",makeHandleFunc(listHandler))
	http.HandleFunc("/add",makeHandleFunc(addHandler))

	if err := http.ListenAndServe(":8055",nil);  err != nil {
		log.Fatal("ListenAndServe: ",err)
	}
}


type HandleFuncType func(http.ResponseWriter,*http.Request)

func makeHandleFunc(f HandleFuncType)(HandleFuncType){
	return func(w http.ResponseWriter,r *http.Request){
		
		defer func(){
			if x := recover(); x!= nil {
				log.Printf("[%v] panic: %v",r.RemoteAddr,x)
			}
		}()
	
		f(w,r)
	}
}


func addHandler(w http.ResponseWriter,r *http.Request) {
	h,_ := template.ParseFiles("template/addinfo.tpl","template/header.tpl","template/footer.tpl")
	h.ExecuteTemplate(w,"addinfo",nil)
}

func listHandler(w http.ResponseWriter,r *http.Request) {	

	if r.Method == "POST" {
		r.ParseForm()
		if len(r.Form["note"][0]) == 0 {
			infoHandler(w,r,`<b>提交失败!</b> <br/>留言不能为空! <br/> <a href="http://127.0.0.1:8055/add">返回</a>`)
			return
		}
		info := fmt.Sprintf("留言人:<a href='mailto:%s'>%s</a><br/>留言:%s<hr>",r.FormValue("email"),//r.Form.Get("email")
			r.FormValue("nickname"),r.FormValue("note"))  
		writeInfo(info)
	}

	list,_ := readInfo()
	msg := map[string]template.HTML{"List": template.HTML(list)}

	h,_ := template.ParseFiles("template/guestbook.tpl","guestbook",msg)
}

func infoHandler(w http.ResponseWriter,r *http.Request,info string) {
	var base = `
<!DOCTYPE html>
<html>
  <head>
    <title>info</title>
    <meta charset="UTF-8">
  </head>
  <body>
  {{.}}
  </body>
</html>
`
	tmpl,err := template.New("提示信息").Parse(base)
	if err != nil {
		panic(err)
	}

	err = tmpl.Execute(w,template.HTML(info))
	if err != nil {
		panic(err)
	}
}

const FILENAME = "Guestbook.log"

func readInfo() (string,error) {
	body,err := ioutil.ReadFile(FILENAME)
	if err != nil {
		return "",err
	}
	return string(body),nil
}

func writeInfo(str string) bool {
	f,err := os.OpenFile(FILENAME,os.O_RDWR|os.O_APPEND|os.O_CREATE,os.ModeType)
	if err != nil {
		panic(err)
	}
	defer f.Close()
	_,err = f.WriteString(str)
	if err != nil {
		panic(err)
	}
	return true
}

其guestbook.tpl：

{{define "guestbook"}}
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>留言本</title>
<style type="text/css">
body{
	margin:0;
	padding:0;
	background:#EAEAEA;
 }
</style>
</head>
<body>

{{template "header"}}

{{.List}}

<center><a href="http://127.0.0.1:8055/add">增加留言</a></center>

{{template "footer"}}

</body>
</html>
{{end}}

实现的效果如下:

整个源码打包在此: 点击下载

MAIL: xcl_168@aliyun.com

BLOG: http://blog.csdn.net/xcl168

（编辑：李大同）

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