利用kaptcha生成登录验证码

利用kaptcha生成登录验证码

导入包

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

由于spring没有整合kaptcha，自定义一个katcha的配置类

@Configuration
public class KaptchaConfig {

    @Bean
    public Producer kaptchaProducer(){
        Properties properties = new Properties();
        //下面是相应的配置
        properties.setProperty("kaptcha.image.width","100");
        properties.setProperty("kaptcha.image.height","40");
        properties.setProperty("kaptcha.textproducer.font.size","32");
        properties.setProperty("kaptcha.textproducer.font.color","0,0,0");
        properties.setProperty("kaptcha.textproducer.char.string","0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ");
        properties.setProperty("kaptcha.textproducer.char.length","4");
        properties.setProperty("kaptcha.noise.impl","com.google.code.kaptcha.impl.NoNoise");

        DefaultKaptcha kaptcha = new DefaultKaptcha();
        Config config = new Config(properties);
        kaptcha.setConfig(config);
        return kaptcha;
    }
}

定义一个/kaptcha接口来返回验证码图片

@Controller
public class HomeController {

    Logger logger = LoggerFactory.getLogger(HomeController.class);

    @Autowired
    Producer kaptcherProducer;//Producer是kaptcha的核心接口，通过它去创建图片以及随机的字符串
    
    @RequestMapping(path = "/kaptcha",method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response, HttpSession session){
        //生成验证码
        String text = kaptcherProducer.createText();
        BufferedImage image = kaptcherProducer.createImage(text);

        //将验证码存入session
        session.setAttribute("kaptcha", text);

        //将图片输出到浏览器
        response.setContentType("image/png");
        try{
            ServletOutputStream outputStream = response.getOutputStream();
            ImageIO.write(image,"png",outputStream);
        }catch (IOException e){
            logger.error("响应验证码失败：" + e.getMessage());
        }
    }

}

输入http://localhost:8080/kaptcha的返回结果