Springboot整合hutool验证码的实例代码

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.8.14</version> <!-- 使用最新版本 -->
</dependency>

package com.base.controller;
import cn.hutool.captcha.CaptchaUtil;
import cn.hutool.captcha.CircleCaptcha;
import cn.hutool.captcha.LineCaptcha;
import cn.hutool.captcha.ShearCaptcha;
import cn.hutool.captcha.generator.MathGenerator;
import cn.hutool.captcha.generator.RandomGenerator;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@RestController
@RequestMapping("/api/captcha")
@Api(tags = "验证码")
public class CaptchaController {
    @GetMapping("/image")
    @ApiOperation("线段干扰的验证码")
    public void getCaptchaImage(HttpServletResponse response) throws IOException {
        //定义图形验证码的长和宽
        LineCaptcha captcha = CaptchaUtil.createLineCaptcha(200, 100);
        System.out.println("验证码："+captcha.getCode());
        // 设置响应类型为图片
        response.setContentType("image/png");
        // 将验证码图片写入响应
        captcha.write(response.getOutputStream());
    }
    @GetMapping("/image2")
    @ApiOperation("圆圈干扰验证码")
    public void getCaptchaImage2(HttpServletResponse response) throws IOException {
        // 创建验证码对象
        //定义图形验证码的长、宽、验证码字符数、干扰元素个数
        CircleCaptcha captcha = CaptchaUtil.createCircleCaptcha(200, 100, 4, 20);
        System.out.println("验证码："+captcha.getCode());
        // 设置响应类型为图片
        response.setContentType("image/png");
        // 将验证码图片写入响应
        captcha.write(response.getOutputStream());
    }
    @GetMapping("/image3")
    @ApiOperation("扭曲干扰验证码")
    public void getCaptchaImage3(HttpServletResponse response) throws IOException {
        //定义图形验证码的长、宽、验证码字符数、干扰线宽度
        ShearCaptcha captcha = CaptchaUtil.createShearCaptcha(200, 100, 4, 4);
        System.out.println("验证码："+captcha.getCode());
        // 设置响应类型为图片
        response.setContentType("image/png");
        // 将验证码图片写入响应
        captcha.write(response.getOutputStream());
    }
    @GetMapping("/image4")
    @ApiOperation("自定义纯数字的验证码")
    public void getCaptchaImage4(HttpServletResponse response) throws IOException {
        //定义图形验证码的长、宽、验证码字符数、干扰线宽度
        // 自定义纯数字的验证码（随机4位数字，可重复）
        RandomGenerator randomGenerator = new RandomGenerator("0123456789", 4);
        LineCaptcha lineCaptcha = CaptchaUtil.createLineCaptcha(200, 100);
        lineCaptcha.setGenerator(randomGenerator);
        // 重新生成code
        lineCaptcha.createCode();
        // 设置响应类型为图片
        response.setContentType("image/png");
        // 将验证码图片写入响应
        lineCaptcha.write(response.getOutputStream());
    }
    @GetMapping("/image5")
    @ApiOperation("加减乘除的验证码")
    public void getCaptchaImage5(HttpServletResponse response) throws IOException {
        ShearCaptcha captcha = CaptchaUtil.createShearCaptcha(200, 45, 4, 4);
        // 自定义验证码内容为四则运算方式
        captcha.setGenerator(new MathGenerator(1));
        // 重新生成code
        captcha.createCode();
        MathGenerator mathGenerator = new MathGenerator();
//      用户输入校验
        System.out.println("验证结果："+mathGenerator.verify(captcha.getCode(), "1"));
        // 设置响应类型为图片
        response.setContentType("image/png");
        // 将验证码图片写入响应
        captcha.write(response.getOutputStream());
    }
}