技術標籤：springbootjava

1.引入依賴

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

2.將kaptcha交給spring 容器管理

@Bean
    public Producer kaptchaProducer
 
(){
        DefaultKaptcha kaptcha = new DefaultKaptcha();
        Properties properties = new Properties();
        properties.setProperty("kaptcha.image.width","100");
        properties.setProperty("kaptcha.image.height","40");
        properties.setProperty("kaptcha.textproducer.font.size"
 
,"40");
        properties.setProperty("kaptcha.textproducer.font.color","0,0,0");
        properties.setProperty("kaptcha.textproducer.char.string","0123456789QWERTYUIOPASDFGHJKLZXCVBNM");
        properties.setProperty("kaptcha.textproducer.char.length"
 
,"4");
        properties.setProperty("kaptcha.noise.impl","com.google.code.kaptcha.impl.NoNoise");

        Config config = new Config(properties);

        kaptcha.setConfig(config);

        return kaptcha;

    }

3.使用kaptcha

    @RequestMapping("/kaptcha")
    public void getKaptcha(HttpServletResponse response, HttpSession session){
        String text = producer.createText();
        BufferedImage image = producer.createImage(text);

        session.setAttribute("kaptcha",text);
        response.setContentType("image/png");
        try {
            ServletOutputStream outputStream = response.getOutputStream();
            ImageIO.write(image,"png",outputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

4.效果