SpringBoot整合生成登录验证码

一、项目说明

使用SpringBoot结合谷歌的验证码生成工具（https://github.com/penggle/kaptcha）来生成登录验证码，通过配置不同的类型，来生成不同的验证码。通常在登录验证的时候，使用的比较多，在这里提供一个简单的demo仅供参考。

二、项目结构

三、项目依赖配置

pom.xml文件配置如下：


    org.springframework.boot
    spring-boot-starter-thymeleaf


    org.springframework.boot
    spring-boot-starter-web




    com.github.penggle
    kaptcha
    2.3.2

属性文件配置：

server:
  port: 8092

spring:
  mvc:   #静态文件
    static-path-pattern: /static
@Configuration
public class KaptchaConfig {

    @Bean(name = "captchaProducer")
    public DefaultKaptcha getKaptchaBean()
    {
        DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
        Properties properties = new Properties();
        properties.setProperty("kaptcha.border", "yes");
        properties.setProperty("kaptcha.border.color", "105,179,90");
        properties.setProperty("kaptcha.textproducer.font.color", "blue");
        properties.setProperty("kaptcha.image.width", "160");
        properties.setProperty("kaptcha.image.height", "60");
        properties.setProperty("kaptcha.textproducer.font.size", "28");
        properties.setProperty("kaptcha.session.key", "kaptchaCode");
        properties.setProperty("kaptcha.textproducer.char.spac", "35");
        properties.setProperty("kaptcha.textproducer.char.length", "5");
        properties.setProperty("kaptcha.textproducer.font.names", "Arial,Courier");
        properties.setProperty("kaptcha.noise.color", "white");
        Config config = new Config(properties);
        defaultKaptcha.setConfig(config);
        return defaultKaptcha;
    }

    @Bean(name = "captchaProducerMath")
    public DefaultKaptcha getKaptchaBeanMath()
    {
        DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
        Properties properties = new Properties();
        properties.setProperty("kaptcha.border", "yes");
        properties.setProperty("kaptcha.border.color", "105,179,90");
        properties.setProperty("kaptcha.textproducer.font.color", "blue");
        properties.setProperty("kaptcha.image.width", "100");
        properties.setProperty("kaptcha.image.height", "30");
        properties.setProperty("kaptcha.textproducer.font.size", "30");
        properties.setProperty("kaptcha.session.key", "kaptchaCodeMath");
        properties.setProperty("kaptcha.textproducer.impl", "com.lhf.springboot.support.KaptchaTextCreator");
        properties.setProperty("kaptcha.textproducer.char.spac", "5");
        properties.setProperty("kaptcha.textproducer.char.length", "6");
        properties.setProperty("kaptcha.textproducer.font.names", "Arial,Courier");
        properties.setProperty("kaptcha.noise.color", "white");
        properties.setProperty("kaptcha.noise.impl", "com.google.code.kaptcha.impl.NoNoise");
        properties.setProperty("kaptcha.obscurificator.impl", "com.google.code.kaptcha.impl.ShadowGimpy");
        Config config = new Config(properties);
        defaultKaptcha.setConfig(config);
        return defaultKaptcha;
    }
}

（2）KaptchaTextCreator.java——验证码文本生成器

package com.lhf.springboot.support;

import com.google.code.kaptcha.text.impl.DefaultTextCreator;

import java.util.Random;


public class KaptchaTextCreator extends DefaultTextCreator {

    private static final String[] CNUMBERS = "0,1,2,3,4,5,6,7,8,9,10".split(",");

    @Override
    public String getText()
    {
        Integer result = 0;
        Random random = new Random();
        int x = random.nextInt(10);
        int y = random.nextInt(10);
        StringBuilder suChinese = new StringBuilder();
        int randomoperands = (int) Math.round(Math.random() * 2);
        if (randomoperands == 0)
        {
            result = x * y;
            suChinese.append(CNUMBERS[x]);
            suChinese.append("*");
            suChinese.append(CNUMBERS[y]);
        }
        else if (randomoperands == 1)
        {
            if (!(x == 0) && y % x == 0)
            {
                result = y / x;
                suChinese.append(CNUMBERS[y]);
                suChinese.append("/");
                suChinese.append(CNUMBERS[x]);
            }
            else
            {
                result = x + y;
                suChinese.append(CNUMBERS[x]);
                suChinese.append("+");
                suChinese.append(CNUMBERS[y]);
            }
        }
        else if (randomoperands == 2)
        {
            if (x >= y)
            {
                result = x - y;
                suChinese.append(CNUMBERS[x]);
                suChinese.append("-");
                suChinese.append(CNUMBERS[y]);
            }
            else
            {
                result = y - x;
                suChinese.append(CNUMBERS[y]);
                suChinese.append("-");
                suChinese.append(CNUMBERS[x]);
            }
        }
        else
        {
            result = x + y;
            suChinese.append(CNUMBERS[x]);
            suChinese.append("+");
            suChinese.append(CNUMBERS[y]);
        }
        suChinese.append("=?@" + result);
        return suChinese.toString();
    }


}

（3）CaptchaController.java——验证码生成控制器

package com.lhf.springboot.controller;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import io.swagger.annotations.Api;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;


@Controller
@Api(value = "验证码")
@RequestMapping("/captcha")
public class CaptchaController {

    @Autowired
    private Producer captchaProducer;

    @Autowired
    private Producer captchaProducerMath;

    
    @GetMapping(value = "/captchaImage")
    public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response)
    {
        ServletOutputStream out = null;
        try
        {
            HttpSession session = request.getSession();
            response.setDateHeader("Expires", 0);
            response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
            response.addHeader("Cache-Control", "post-check=0, pre-check=0");
            response.setHeader("Pragma", "no-cache");
            response.setContentType("image/jpeg");

            String type = request.getParameter("type");
            String capStr = null;
            String code = null;
            BufferedImage bi = null;
            if ("math".equals(type))//验证码为算数 8*9 类型
            {
                String capText = captchaProducerMath.createText();
                capStr = capText.substring(0, capText.lastIndexOf("@"));
                code = capText.substring(capText.lastIndexOf("@") + 1);
                bi = captchaProducerMath.createImage(capStr);
            }
            else if ("char".equals(type))//验证码为 abcd类型
            {
                capStr = code = captchaProducer.createText();
                bi = captchaProducer.createImage(capStr);
            }
            session.setAttribute(Constants.KAPTCHA_SESSION_KEY, code);
            out = response.getOutputStream();
            ImageIO.write(bi, "jpg", out);
            System.out.println("bi = " + bi);
            System.out.println("out =" + out);
            out.flush();

        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        finally
        {
            try
            {
                if (out != null)
                {
                    out.close();
                }
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
        return null;
    }
}

（4）HomeController.java——前端页面入口控制器

package com.lhf.springboot.controller;

import com.google.code.kaptcha.Constants;
import com.lhf.springboot.model.User;
import io.swagger.annotations.ApiOperation;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.servlet.http.HttpServletRequest;


@Controller
public class HomeController {

    
    @ApiOperation(value="请求到登陆界面",notes="请求到登陆界面")
    @GetMapping("/home")
    public String home(HttpServletRequest request, Model model) {

        //登录逻辑
        System.out.println("验证码.....");
        return "home";
    }

    @PostMapping("home")
    public ModelAndView home( String code, RedirectAttributes redirectAttributes,  Model model, HttpServletRequest request) {
        ModelAndView view =new ModelAndView();
        String scode = (String)request.getSession().getAttribute(Constants.KAPTCHA_SESSION_KEY);

        System.out.println("code = " + code );
        System.out.println("scode = " + scode);


        if (!code.equals(scode)){
            //跳转到 get请求的登陆方法
            view.setViewName("error");
            return view;
        }
        //跳转到 get请求的登陆方法
        view.setViewName("home");
        return view;

    }

}

2. 前端

home.html




    
    Title

通过修改前端代码，实现算术或字符串验证码，前端代码如下：

其中type取值如下：

1. type=math : 验证码为算术类型

2. type=char : 验证码为字符串类型

其他代码文件不是重点，不在列举

五、项目运行效果

启动项目，访问：http://localhost:8092/home 效果如下：

后续完整代码将会开源处理，如果有急需的可以联系我，私发！

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SpringBoot整合生成登录验证码

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