Golang使用验证码
作者:互联网
使用的第三方库
go get github.com/dchest/captcha
package main
import (
"fmt"
"github.com/dchest/captcha"
"io"
"log"
"net/http"
"text/template"
)
var formTemplate = template.Must(template.New("example").Parse(formTemplateSrc))
func showFormHandler(w http.ResponseWriter, r *http.Request) {
d := struct {
CaptchaId string
}{
captcha.New(),
}
if err := formTemplate.Execute(w, &d); err != nil {
// 处理错误,500 服务器异常
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
func processFormHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
// VerifyString方法用来验证并删除验证码,因为验证之后验证码就没存在的意义了
// captchaId是标识验证码的ID,captchaSolution是客户输入的数字
if !captcha.VerifyString(r.FormValue("captchaId"), r.FormValue("captchaSolution")) {
io.WriteString(w, "错误的验证码解决方案!不允许机器人!\n")
} else {
io.WriteString(w, "伟大的人类!你破解了验证码。\n")
}
io.WriteString(w, "<br><a href='/'>再试一次</a>")
}
func main() {
http.HandleFunc("/", showFormHandler) // 验证码主页面
http.HandleFunc("/process", processFormHandler) // 验证客户端发送过来的验证码是否正确
http.Handle("/captcha/", captcha.Server(captcha.StdWidth, captcha.StdHeight)) // 图像的生成,并返回图片
fmt.Println("服务运行于: http://localhost:8666")
if err := http.ListenAndServe("localhost:8666", nil); err != nil {
log.Fatal(err)
}
}
const formTemplateSrc = `
<!doctype html>
<head><title>验证码</title></head>
<body>
<script>
function reload() {
setSrcQuery(document.getElementById('image'), "reload=" + (new Date()).getTime());
return false;
}
</script>
<form action="/process" method=post>
<p>输入你在下面的图片中看到的数字:</p>
<p><img id=image src="/captcha/{{.CaptchaId}}.png" alt="Captcha image"></p>
<input type=hidden name=captchaId value="{{.CaptchaId}}"><br>
<input name=captchaSolution>
<input type=submit value=提交>
</form>
`
运行后访问页面:
输入正确后跳转:
输入错误后跳转:
标签:http,WriteString,err,验证码,Golang,captcha,io,使用 来源: https://blog.csdn.net/qq_43279457/article/details/118072744