<properties>
	<kaptcha.version>0.0.9</kaptcha.version>
</properties>
<dependency>
    <groupId>com.github.axet</groupId>
    <artifactId>kaptcha</artifactId>
    <version>${kaptcha.version}</version>
</dependency>

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;
/**
 * 生成验证码配置类
 */
@Configuration
public class KaptchaConfig {

    @Bean
    public DefaultKaptcha producer() {
        Properties properties = new Properties();
        properties.put("kaptcha.border", "no");
        properties.put("kaptcha.textproducer.char.space", "5");
        properties.put("kaptcha.textproducer.font.color", "blue");
        properties.put("kaptcha.textproducer.char.length", "4");
        properties.put("kaptcha.image.height", "40");
        properties.put("kaptcha.image.width", "160");
        properties.put("kaptcha.textproducer.font.size", "30");
        Config config = new Config(properties);
        DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
        defaultKaptcha.setConfig(config);
        return defaultKaptcha;
    }
}

	@Autowired
    private Producer producer;
	
    /**
	 * 获取验证码图片
	 * @param request
	 * @param response
	 * @return
	 * @throws Exception
	 */
	@RequestMapping(value="/photo",method=RequestMethod.GET)
	 public void captcha(HttpServletResponse response,HttpServletRequest request)throws ServletException, IOException {
		response.setHeader("Cache-Control", "no-store, no-cache");
        response.setContentType("image/jpeg");
        //生成文字验证码
        String text = producer.createText();
        //生成图片验证码
        BufferedImage image = producer.createImage(text);
        //保存到shiro session（注意：如果没有securityManager配置，则暂时无法工作，测试时先注释掉）
        request.getSession().setAttribute("code",text);
        ServletOutputStream out = response.getOutputStream();
        ImageIO.write(image, "jpg", out);
        out.flush();
       return ;
    }