使用Kaptcha实现的验证码功能

<dependency>
			<groupId>com.oopsguy.kaptcha</groupId>
			<artifactId>kaptcha-spring-boot-starter</artifactId>
			<version>1.0.0-beta-2</version>
</dependency>

完成application.yml配置文件

html 复制代码

kaptcha:
#  图片大小
  image:
    width: 100
    height: 60
#  字体
  text-producer:
    font:
      size: 28
  items:
#    home captcha
    admin:
     path: /admin/captcha
     session:
       key: HOME_KAPTCHA_SESSION_KEY
       data: HOME_KAPTCHA_SESSION_DATE

浏览器显示验证码

运行：即可在浏览器访问验证码

前端页面

登录页面

html 复制代码

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">

  <title>验证码</title>
  <style>
    #inputCaptcha {
      height: 30px;
      vertical-align: middle; 
    }
    #verificationCodeImg{
      vertical-align: middle; 
    }
    #checkCaptcha{
      height: 40px;
      width: 100px;
    }
  </style>
</head>

<body>
  <h1>输入验证码</h1>
  <div id="confirm">
    <input type="text" name="inputCaptcha" id="inputCaptcha">
    <img id="verificationCodeImg" src="/admin/captcha" style="cursor: pointer;" title="看不清？换一张" />
    <input type="button" value="提交" id="checkCaptcha">
  </div>
  <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
  <script>
    
    $("#verificationCodeImg").click(function(){
      $(this).hide().attr('src', '/admin/captcha?dt=' + new Date().getTime()).fadeIn();
    });

    $("#checkCaptcha").click(function () {
      $.ajax({
        type:"get",
        url:"/admin/check",
        data:{
          captcha:$("#inputCaptcha").val()
        },
        success:function(result){
          if(result){
            location.href="success.html";
          }else{
            alert("验证码错误");
          }
        }
      });
    });

  </script>
</body>

</html>

验证成功页面

html 复制代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>验证成功页</title>
</head>
<body>
    <h1>验证成功</h1>
</body>
</html>

后端

java 复制代码

package com.lele.demo.controller;

import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpSession;
import javax.xml.crypto.Data;
import java.util.Date;

@RequestMapping("/admin")
@RestController
public class CaptchaController {
    private static final String KAPTCHA_SESSION_KEY= "HOME_KAPTCHA_SESSION_KEY";
    private static final String KAPTCHA_SESSION_DATE="HOME_KAPTCHA_SESSION_DATE";
    //一分钟60秒，一秒1000毫秒
    private static final Long SESSION_TIME_OUT=60*1000L;

//    1.从session中获取生成的验证码
//    2.对比前端的验证码与session中的是否一样
    //验证成功返回true 失败返回false
    @RequestMapping("/check")
    public Boolean check(String captcha ,HttpSession session){
        if(!StringUtils.hasLength(captcha)){
            return false;
        }
        //从session中获取验证码
        String saveCaptcha=(String) session.getAttribute(KAPTCHA_SESSION_KEY);
        Date saveDate=(Date) session.getAttribute(KAPTCHA_SESSION_DATE);
        //比对验证码
        if(captcha.equals(saveCaptcha)){
            //比对日期
            if(saveDate==null || System.currentTimeMillis()-saveDate.getTime()<SESSION_TIME_OUT){
                return true;
            }
            return true;
        }
        return false;
    }
}

测试后端代码

实现结果