生成条形码的算法或内部逻辑可在第三方条形码包中找到。这里的目标是展示一个示例，如何使用包并创建Web应用程序。

安装软件包：

go get github.com/boombuler/barcode

示例代码：main.go

FormValue函数将给出dataString输入字段的值，该字段将用于使用Encode函数生成QR码。

package main

import (
	"image/png"
	"net/http"
	"text/template"

	"github.com/boombuler/barcode"
	"github.com/boombuler/barcode/qr"
)

type Page struct {
	Title string
}

func main() {
	http.HandleFunc("/", homeHandler)
	http.HandleFunc("/generator/", viewCodeHandler)
	http.ListenAndServe(":8080", nil)
}

func homeHandler(w http.ResponseWriter, r *http.Request) {
	p := Page{Title: "QR Code Generator"}

	t, _ := template.ParseFiles("generator.html")
	t.Execute(w, p)
}

func viewCodeHandler(w http.ResponseWriter, r *http.Request) {
	dataString := r.FormValue("dataString")

	qrCode, _ := qr.Encode(dataString, qr.L, qr.Auto)
	qrCode, _ = barcode.Scale(qrCode, 512, 512)

	png.Encode(w, qrCode)
}

示例代码：generator.html

<h1>{{.Title}}</h1>
<div>Please enter the string you want to QRCode.</div>
<form action="generator/" method=post>
    <input type="text" name="dataString">
    <input type="submit" value="Submit">
</form>