How to use java to get website login verification code
Verification code generation
This effect is achieved using the easy-captcha toolkit. First, you need to add relevant dependencies to pom.xml. The code is as follows:
<dependency>
<groupId>com.github.whvcse</groupId>
<artifactId>easy-captcha</artifactId>
<version>1.6.2</version>
</dependency>Verification code format
easy-captcha verification code tool supports GIF, Chinese, arithmetic and other types, which are implemented through the following instance objects:
SpecCaptcha (PNG type static image verification code)
GifCaptcha (Gif type picture verification code)
ChineseCaptcha (GIF type Chinese picture verification code)
-
ArithmeticCaptcha (arithmetic type picture verification code)
Character types are divided into the following types:
TYPE_DEFAULT: mixed numbers and letters
TYPEONLYNUMBER: Pure numbers
TYPEONLYCHAR: Pure letters
TYPEONLYUPPER: Pure uppercase letters
TYPEONLYLOWER: pure lowercase letters
TYPENUMAND_UPPER: mixed numbers and uppercase letters
Backend logic Implementation
package com.yanx.controller;
import com.wf.captcha.SpecCaptcha;
import com.wf.captcha.base.Captcha;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.thymeleaf.util.StringUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Controller
public class KapchaController {
@GetMapping("/kaptcha")
public void defaultKaptcha(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws IOException {
httpServletResponse.setHeader("Cache-Control","no-store");
httpServletResponse.setHeader("Pragma","no-cache");
httpServletResponse.setDateHeader("Expires",0);
httpServletResponse.setContentType("image/gif");
//三个参数分别为宽、高、位数
SpecCaptcha captcha=new SpecCaptcha(75,30,4);
//设置类型为数字和字母混合
captcha.setCharType(Captcha.TYPE_DEFAULT);
//设置字体
captcha.setCharType(Captcha.FONT_9);
//验证码存入session
httpServletRequest.getSession().setAttribute("verifyCode",captcha.text().toLowerCase());
//输出图片流
captcha.out(httpServletResponse.getOutputStream());
}
}Here the controller adds the defaultKaptcha() method. The path intercepted and processed by this method is/kaptcha
Implementation of front-end logic
Create a new kaptcha.html page in the static directory, the code is as follows:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>验证码</title>
</head>
<body>
<img src="/static/imghw/default1.png" data-src="/kaptcha" class="lazy" onclick="this.src='/kaptcha?t=new Date()'" alt="How to use java to get website login verification code" >
</body>
</html>Access the backend verification code path/kaptcha, the verification code is in the form of a picture. The onclick method can dynamically switch to display the verification code when the label is clicked.
Start the Spring Boot project, open the browser and enter the address:
http://localhost:8080/kaptcha.html
The effect is as follows:
Verification code verification
Back-end code
package com.yanx.controller;
import com.wf.captcha.SpecCaptcha;
import com.wf.captcha.base.Captcha;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.thymeleaf.util.StringUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
@Controller
public class KapchaController {
@GetMapping("/kaptcha")
public void defaultKaptcha(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws IOException {
httpServletResponse.setHeader("Cache-Control","no-store");
httpServletResponse.setHeader("Pragma","no-cache");
httpServletResponse.setDateHeader("Expires",0);
httpServletResponse.setContentType("image/gif");
//三个参数分别为宽、高、位数
SpecCaptcha captcha=new SpecCaptcha(75,30,4);
//设置类型为数字和字母混合
captcha.setCharType(Captcha.TYPE_DEFAULT);
//设置字体
captcha.setCharType(Captcha.FONT_9);
//验证码存入session
httpServletRequest.getSession().setAttribute("verifyCode",captcha.text().toLowerCase());
//输出图片流
captcha.out(httpServletResponse.getOutputStream());
}
@GetMapping("/verify")
@ResponseBody
public String verify(@RequestParam("code") String code, HttpSession session){
if(StringUtils.isEmpty(code)){
return "验证码不能为空";
}
String kapchaCode = session.getAttribute("verifyCode")+"";
if(StringUtils.isEmpty(kapchaCode)||!code.toLowerCase().equals(kapchaCode)){
return "验证码输入错误";
}
return "验证成功";
}
}Front-end code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>验证码验证</title>
</head>
<body>
<img src="/static/imghw/default1.png" data-src="/kaptcha" class="lazy" onclick="this.src='/kaptcha?d=new Date()'" alt="How to use java to get website login verification code" >
<input type="text" maxlength="5" id="code" placeholder="请输入验证码"/>
<button id="verify">验证</button>
<p id="verifyResult"></p>
</body>
<script src="https://s3.pstatp.com/cdn/expire-1-M/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript" >
$(function(){
//验证按钮点击事件
$('#verify').click(function(){
var code=$('#code').val();
$.ajax({
type:'GET',//方法类型
url:'/verify?code='+code,
success:function(result){
$('#verifyResult').html(result);
},
error:function(){
alert('请求失败');
},
});
});
});
</script>
</html>Effect
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