本文主要是介绍使用Hutool工具类轻松生成验证码,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
效果图:
引入依赖:
<!--hutool工具包-->
<dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.7.15</version>
</dependency>
核心代码
import cn.hutool.captcha.CaptchaUtil;
import cn.hutool.captcha.CircleCaptcha;
import cn.hutool.captcha.ShearCaptcha;
import cn.hutool.core.io.IoUtil;
import cn.hutool.core.util.RandomUtil;
import javax.imageio.ImageIO;import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.UUID;import static cn.hutool.core.img.ImgUtil.toBufferedImage;@RestController
@RequiredArgsConstructor
@RequestMapping("/api/performance")
public class PerformanceController {
/*** 获取扭曲干扰的验证码* @param response*/@GetMapping("/createShearCaptcha")public void getShearCaptcha(HttpServletResponse response){//定义图形验证码的长、宽、验证码字符数、干扰线宽度ShearCaptcha shearCaptcha = CaptchaUtil.createShearCaptcha(150, 50,4,3);//设置背景颜色shearCaptcha.setBackground(new Color(249, 251, 220));//生成四位验证码String code = RandomUtil.randomNumbers(4);//生成验证码图片Image image = shearCaptcha.createImage(code);//返回验证码信息responseCode(response, code, image);}/*** 获取圆圈干扰的验证码* @param response*/@GetMapping("/createCircleCaptcha")public void getCircleCaptcha(HttpServletResponse response){//定义图形验证码的长、宽、验证码位数、干扰圈圈数量CircleCaptcha circleCaptcha = CaptchaUtil.createCircleCaptcha(150, 50,4,30);//设置背景颜色circleCaptcha.setBackground(new Color(249, 251, 220));//生成四位验证码String code = RandomUtil.randomNumbers(4);Image image = circleCaptcha.createImage(code);//返回验证码信息responseCode(response, code, image);}private static void responseCode(HttpServletResponse response, String code, Image image) {response.setContentType("image/jpeg");response.setHeader("Pragma", "no-cache");response.setHeader("Cache-Control", "no-cache");String uuidStr = UUID.randomUUID().toString().replace("-", "");response.setHeader("verifyCodeUuid",uuidStr);try {BufferedImage bufferedImage = toBufferedImage(image);// 创建一个ByteArrayOutputStream,用于存储图片数据ByteArrayOutputStream baos = new ByteArrayOutputStream();// 写入图片数据到ByteArrayOutputStreamImageIO.write(bufferedImage, "jpeg", baos);// 将ByteArrayOutputStream转换为ByteArrayInputStreambyte[] imageInBytes = baos.toByteArray();//输出IoUtil.write(response.getOutputStream(), true, imageInBytes);} catch (IOException e) {throw new RuntimeException(e);}}
}
在这里响应的时候,我在请求头中加了个verifyCodeUuid (验证码唯一标识), 是用于后续 校验验证码使用的,可以将验证码存在redis ,存储的key的话可以使用 【前缀+请求ip+verifyCodeUuid 】 形式来进行存储,后续获取校验的时候也是一样的key,前端就需要将verifyCodeUuid 和用户输入的验证码一并传过来。这是一种简单的实现,具体 实现还需看具体业务,这里供参考。
@GetMapping("/createShearCaptchaV2")public void getShearCaptchaV2(HttpServletResponse response){//定义图形验证码的长、宽、验证码字符数、干扰线宽度ShearCaptcha shearCaptcha = CaptchaUtil.createShearCaptcha(150, 50,4,3);response.setContentType("image/jpeg");response.setHeader("Pragma", "no-cache");response.setHeader("Cache-Control", "no-cache");String uuidStr = UUID.randomUUID().toString().replace("-", "");log.info("生成验证码 uuidStr:{} ,code:{}",uuidStr, shearCaptcha.getCode());response.setHeader("verifyCodeUuid",uuidStr);try {//输出shearCaptcha.write(response.getOutputStream());} catch (IOException e) {throw new RuntimeException(e);}}
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