使用google.kaptcha来生成图片验证码的实现方法

  <dependency>
   <groupId>com.google.code</groupId>
   <artifactId>kaptcha</artifactId>
   <version>2.3.2</version>
  </dependency>

mvn install:install-file -DgroupId=com.google.code -DartifactId=kaptcha -Dversion=0.0.9 -Dfile=kaptcha-0.0.9.jar -Dpackaging=jar -DgeneratePom=true

@Configuration
public class KaptchaConfig {
 @Bean
 public DefaultKaptcha producer() {
  Properties properties = new Properties();
  properties.put("kaptcha.border", "no");
  properties.put("kaptcha.textproducer.font.color", "black");
  properties.put("kaptcha.textproducer.char.space", "5");
  Config config = new Config(properties);
  DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
  defaultKaptcha.setConfig(config);
  return defaultKaptcha;
 }
}

 //图片验证码
 @RequestMapping("/captcha.jpg")
 public void captcha(HttpServletResponse response)throws IOException {
  response.setHeader("Cache-Control", "no-store, no-cache");
  response.setContentType("image/jpeg");
  //生成文字验证码
  String text = producer.createText();
  producer.createText();
  //生成图片验证码
  BufferedImage image = producer.createImage(text);
  ServletOutputStream out = response.getOutputStream();
  ImageIO.write(image, "jpg", out);
 }