kaptcha

Warning

kaptcha

<dependency>
  <groupId>com.heanbian</groupId>
  <artifactId>kaptcha</artifactId>
  <version>3.0.3</version>
</dependency>

http://code.google.com/p/kaptcha/

spring boot example

step 1

@Configuration
public class KcaptchaConfig {

	@Bean
	DefaultKaptcha getDefaultKaptcha() {
		Properties p = new Properties(11);
		p.setProperty(Constants.KAPTCHA_BORDER, "no");
		p.setProperty(Constants.KAPTCHA_IMAGE_WIDTH, "200");
		p.setProperty(Constants.KAPTCHA_IMAGE_HEIGHT, "40");
		p.setProperty(Constants.KAPTCHA_TEXTPRODUCER_CHAR_LENGTH, "6");
		p.setProperty(Constants.KAPTCHA_TEXTPRODUCER_FONT_NAMES, "宋体");
		p.setProperty(Constants.KAPTCHA_TEXTPRODUCER_FONT_SIZE, "38");
		p.setProperty(Constants.KAPTCHA_TEXTPRODUCER_CHAR_STRING, "2345678abcehmkx");
		p.setProperty(Constants.KAPTCHA_TEXTPRODUCER_CHAR_SPACE, "4");
		p.setProperty(Constants.KAPTCHA_TEXTPRODUCER_IMPL, "com.google.code.kaptcha.text.impl.TextProducer456");

		p.setProperty(Constants.KAPTCHA_BACKGROUND_CLR_FROM, "white");
		p.setProperty(Constants.KAPTCHA_BACKGROUND_CLR_TO, "white");

		DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
		defaultKaptcha.setConfig(new Config(p));
		return defaultKaptcha;
	}
}

step 2

	@Autowired
	private DefaultKaptcha captchaProducer;

step 3

	String captchaText = captchaProducer.createText();
	BufferedImage image = captchaProducer.createImage(captchaText);

	FastByteArrayOutputStream out = new FastByteArrayOutputStream();
	ImageIO.write(image, "png", out);
	String captchaImg = Base64.getEncoder().encodeToString(out.toByteArray());
	out.close();