springboot 实现图片验证码描叙

以下是SpringBoot实现图片验证码功能的步骤：

1. 引入maven依赖

<dependency>
    <groupId>com.github.penggle</groupId>
    <artifactId>kaptcha</artifactId>
    <version>2.3.2</version>
</dependency>

2. config文件配置

@Configuration
public class KaptchaConfig {
    @Bean
    public DefaultKaptcha defaultKaptcha() {
        Properties properties = new Properties();
        properties.setProperty("kaptcha.border", "no");
        properties.setProperty("kaptcha.textproducer.font.color", "black");
        // 更多配置项可以根据需求设置
        // ...
        Config config = new Config(properties);
        DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
        defaultKaptcha.setConfig(config);
        return defaultKaptcha;
    }
}

3. 逻辑代码实现

@Controller
public class CaptchaController {
    @Autowired
    private DefaultKaptcha defaultKaptcha;

    @GetMapping("/captcha.jpg")
    public void captcha(HttpServletResponse response, HttpSession session) {
        // 生成验证码
        String text = defaultKaptcha.createText();
        session.setAttribute("captcha", text);
        // 将验证码输出到页面
        BufferedImage image = defaultKaptcha.createImage(text);
        try {
            ImageIO.write(image, "jpg", response.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}