SpringBoot使用kaptcha生成验证码

ゝ一纸荒年。 2022-05-10 02:16 278阅读 0赞

1.在pom文件中添加依赖

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

2.新建KaptchaConfig.java，在其中配置验证码相关的属性

/**
     * Created By Seven.wk
     * Description: 验证码配置类
     * Created At 2018/08/07
     */
    @Component
    public class KaptchaConfig {
        @Bean
        public DefaultKaptcha getDefaultKaptcha() {
            DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
            Properties properties = new Properties();
            properties.setProperty("kaptcha.border", "yes");
            properties.setProperty("kaptcha.border.color", "105,179,90");
            properties.setProperty("kaptcha.textproducer.font.color", "blue");
            properties.setProperty("kaptcha.image.width", "110");
            properties.setProperty("kaptcha.image.height", "40");
            properties.setProperty("kaptcha.textproducer.font.size", "30");
            properties.setProperty("kaptcha.session.key", "code");
            properties.setProperty("kaptcha.textproducer.char.length", "4");
            properties.setProperty("kaptcha.textproducer.font.names", "宋体,楷体,微软雅黑");
            Config config = new Config(properties);
            defaultKaptcha.setConfig(config);
    
            return defaultKaptcha;
        }
    }

3.在控制器中生成验证码并保存为图片

@RestController
    @RequestMapping("/api")
    public class ILoginController {
    
        @Autowired
        private DefaultKaptcha defaultKaptcha;
    
        /**
         * 生成验证码
         * @param response
         * @param session
         * @throws IOException
         */
        @GetMapping("/captcha")
        public void captcha(HttpServletResponse response,
                            HttpSession session) throws IOException {
            byte[] captchaChallengeAsJpeg = null;
            ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
            try {
                //生产验证码字符串并保存到session中
                String createText = defaultKaptcha.createText();
                session.setAttribute(Const.CAPTCHA_CODE, createText);
                //使用生产的验证码字符串返回一个BufferedImage对象并转为byte写入到byte数组中
                BufferedImage challenge = defaultKaptcha.createImage(createText);
                ImageIO.write(challenge, "jpg", jpegOutputStream);
            } catch (IllegalArgumentException e) {
                response.sendError(HttpServletResponse.SC_NOT_FOUND);
                return;
            }
    
            //定义response输出类型为image/jpeg类型，使用response输出流输出图片的byte数组
            captchaChallengeAsJpeg = jpegOutputStream.toByteArray();
            response.setHeader("Cache-Control", "no-store");
            response.setHeader("Pragma", "no-cache");
            response.setDateHeader("Expires", 0);
            response.setContentType("image/jpeg");
            ServletOutputStream responseOutputStream = response.getOutputStream();
            responseOutputStream.write(captchaChallengeAsJpeg);
            responseOutputStream.flush();
            responseOutputStream.close();
        }
    
    }

4.现在我们可以通过访问/api/captcha，就可以看到验证码了

5.前端使用方法如下：

这样每次点击图片时就可以更换验证码了。