Go語言實(shí)現(xiàn)簡(jiǎn)單留言板的方法

2020-04-01 19:20:13

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供稿：網(wǎng)友

這篇文章主要介紹了Go語言實(shí)現(xiàn)簡(jiǎn)單留言板的方法,涉及數(shù)據(jù)庫、模板頁面元素等留言板相關(guān)技巧,具有一定參考借鑒價(jià)值,需要的朋友可以參考下

本文實(shí)例講述了Go語言實(shí)現(xiàn)簡(jiǎn)單留言板的方法。分享給大家供大家參考。具體實(shí)現(xiàn)方法如下：

復(fù)制代碼代碼如下:

		package main
		import (
		    // "fmt"
		    "io"
		    "log"
		    "net/http"
		    "text/template"
		    "time"
		    "database/sql"
		    "github.com/ziutek/mymysql/godrv"
		)
		    
		// 留言結(jié)構(gòu)
		type Liuyan struct {
		    Id int
		    Name string
		    Content string
		    Time int
		}
		    
		// 顯示留言時(shí)間
		func (l Liuyan) ShowTime() string {
		    t := time.Unix(int64(l.Time), 0)
		    return t.Format("2006-01-02 15:04:05")
		}
		    
		func main() {
		    godrv.Register("SET NAMES utf8")
		    
		    // 連接數(shù)據(jù)庫
		    db, err := sql.Open("mymysql", "tcp:127.0.0.1:3306*go/root/123456")
		    if err != nil {
		        panic(err)
		    }
		    defer db.Close()
		    
		    // 準(zhǔn)備模板
		    tpl, err := template.New("liuyanbook").Parse(html)
		    if err != nil {
		        panic(err)
		    }
		    
		    // 顯示留言頁面 /
		    requestList := func(w http.ResponseWriter, req *http.Request) {
		        // 查詢數(shù)據(jù)
		        rows, err := db.Query("select * from liuyan")
		        if err != nil {
		            log.Fatal(err)
		        }
		        defer rows.Close()
		    
		        // 獲取數(shù)據(jù)
		        lys := []Liuyan{}
		        for rows.Next() {
		            ly := Liuyan{}
		            err := rows.Scan(&ly.Id, &ly.Name, &ly.Content, &ly.Time)
		            if nil != err {
		                log.Fatal(err)
		            }
		            lys = append(lys, ly)
		        }
		    
		        // 顯示數(shù)據(jù)
		        err = tpl.ExecuteTemplate(w, "list", lys)
		        if err != nil {
		            log.Fatal(err)
		        }
		    }
		    
		    // 留言頁面 /liuyan
		    requestLiuyan := func(w http.ResponseWriter, req *http.Request) {
		        err := req.ParseForm()
		        if err != nil{
		            log.Fatal(err)
		        }
		    
		        if "POST" == req.Method {
		            if len(req.Form["name"]) < 1 {
		                io.WriteString(w, "參數(shù)錯(cuò)誤!/n")
		                return
		            }
		            if len(req.Form["content"]) < 1 {
		                io.WriteString(w, "參數(shù)錯(cuò)誤!/n")
		                return
		            }
		    
		            name := template.HTMLEscapeString(req.Form.Get("name"))
		            content := template.HTMLEscapeString(req.Form.Get("content"))
		    
		            // sql語句
		            sql, err := db.Prepare("insert into liuyan(name, content, time) values(?, ?, ?)")
		            if err != nil {
		                log.Fatal(err)
		            }
		            defer sql.Close()
		    
		            // sql參數(shù),并執(zhí)行
		            _, err = sql.Exec(name, content, time.Now().Unix())
		            if err != nil {
		                log.Fatal(err)
		            }
		    
		            // 跳轉(zhuǎn)
		            w.Header().Add("Location", "/")
		            w.WriteHeader(302)
		    
		            // 提示信息
		            io.WriteString(w, "提交成功!/n")
		    
		            return
		        }
		    
		        err = tpl.ExecuteTemplate(w, "liuyan", nil)
		        if err != nil {
		            log.Fatal(err)
		        }
		    }
		    
		    http.HandleFunc("/", requestList)
		    http.HandleFunc("/liuyan", requestLiuyan)
		    err = http.ListenAndServe(":12345", nil)
		    if err != nil {
		        log.Fatal("ListenAndServe: ", err)
		    }
		}
		    
		// 網(wǎng)頁模板
		var html string = `{{define "list"}}{{/* 留言列表頁面 */}}<!DOCTYPE html>
		<html>
		<head>
		<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
		</head>
		<body>
		    <p><a href="/liuyan">給我留言</a></p>
		    <table>
		{{range .}}
		    <tr>
		        <td>{{.Id}}</td><td>{{.Name}}</td><td>{{.Content}}</td><td>{{.ShowTime}}</td>
		    </tr>
		{{end}}
		    </table>
		</body>
		</html>{{end}}
		{{define "liuyan"}}{{/* 發(fā)布留言頁面 */}}<!DOCTYPE html>
		<html>
		<head>
		<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
		</head>
		<body>
		    <form method="post">
		        姓名:<input type="text" name="name" /><br>
		        內(nèi)容:<input type="text" name="content" /><br>
		        <input type="submit" value="提交" />
		    </form>
		</body>
		</html>{{end}}