springboot实现验证码生成及验证功能

1.springboot整合hutool-captcha生成验证码，首先是添加依赖 ：

            cn.hutool
            hutool-captcha
            ${hutool-captcha.version}
        

2.生成并显示验证码 

import cn.hutool.captcha.CaptchaUtil;
import cn.hutool.captcha.ShearCaptcha;
import ltd.newbee.mall.common.Constants;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 
 */
@Controller
public class CommonController {

    @GetMapping("/common/kaptcha")
    public void defaultKaptcha(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        httpServletResponse.setHeader("Cache-Control", "no-store");
        httpServletResponse.setHeader("Pragma", "no-cache");
        httpServletResponse.setDateHeader("Expires", 0);
        httpServletResponse.setContentType("image/png");

        ShearCaptcha shearCaptcha= CaptchaUtil.createShearCaptcha(150, 30, 4, 2);

        // 验证码存入session
        httpServletRequest.getSession().setAttribute("verifyCode", shearCaptcha);

        // 输出图片流
        shearCaptcha.write(httpServletResponse.getOutputStream());
    }

    @GetMapping("/common/mall/kaptcha")
    public void mallKaptcha(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        httpServletResponse.setHeader("Cache-Control", "no-store");
        httpServletResponse.setHeader("Pragma", "no-cache");
        httpServletResponse.setDateHeader("Expires", 0);
        httpServletResponse.setContentType("image/png");

        ShearCaptcha shearCaptcha= CaptchaUtil.createShearCaptcha(110, 40, 4, 2);

        // 验证码存入session
        httpServletRequest.getSession().setAttribute(Constants.MALL_VERIFY_CODE_KEY, shearCaptcha);

        // 输出图片流
        shearCaptcha.write(httpServletResponse.getOutputStream());
    }
}

3.前端逻辑实现