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 {
@Bean
public 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redis
redisUtil.hset(Constants.CAPTURE , uuid.toString(), 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);
}
}
}