本文主要是介绍验证码功能的思路和做法，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！
验证码登录的思路和流程
步骤
1.导入依赖
<dependency><groupId>com.github.axet</groupId><artifactId>kaptcha</artifactId><version>0.0.9</version>
</dependency>2.写一个验证码的配置类
package com.lzy.config;import cn.hutool.json.JSON;
import cn.hutool.json.JSONObject;
import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.google.code.kaptcha.util.Config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.Properties;@Configuration
public class KaptchaConfig {@Beanpublic DefaultKaptcha producer() {//验证码长宽高Properties properties = new Properties();properties.put("kaptcha.border", "no");properties.put("kaptcha.textproducer.font.color", "black");properties.put("kaptcha.textproducer.char.space", "4");properties.put("kaptcha.image.height", "40");properties.put("kaptcha.image.width", "120");properties.put("kaptcha.textproducer.font.size", "30");Config config = new Config(properties);DefaultKaptcha defaultKaptcha = new DefaultKaptcha();defaultKaptcha.setConfig(config);return defaultKaptcha;}
}3.使用这个类,创建一个uuid作为key,并得到一个随机验证码,再将验证码转化为图片,再转化为base64进制,并且按上对应的前缀
package com.lzy.controller;import cn.hutool.json.JSONObject;
import com.lzy.common.lang.Result;
import com.lzy.util.Constants;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Base64;
import java.util.UUID;@RestController
public class CaptureController extends BaseController {@GetMapping("/captcha")public Result captcha() {// 生成uuid作为验证码的唯一标识UUID uuid = UUID.randomUUID();// 生成验证码String text = producer.createText();BufferedImage image = producer.createImage(text);String base64Image = convertImageToBase64(image);// 将验证码存入redisredisUtil.set(Constants.CAPTURE + uuid, text, 120);JSONObject jsonObject = new JSONObject();jsonObject.set("token", uuid.toString());jsonObject.set("captchaImg", base64Image);return Result.success(jsonObject);}private String convertImageToBase64(BufferedImage image) {try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {ImageIO.write(image, "png", baos);byte[] imageBytes = baos.toByteArray();String base64Image = Base64.getEncoder().encodeToString(imageBytes);return "data:image/png;base64," + base64Image;} catch (IOException e) {throw new RuntimeException("Error converting image to Base64", e);}}
}
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