How to use java to get website login verification code-Java Tutorial-php.cn

How to use java to get website login verification code

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Release： 2023-05-10 18:28:06

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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:


    com.github.whvcse
    easy-captcha
    1.6.2

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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());
    }
 
}

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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:




    
    验证码

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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:

How to use java to get website login verification code

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";
    }
}

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Front-end code

验证码验证

How to use java to get website login verification code

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Effect

How to use java to get website login verification code

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