springMVC实现图形验证码（kaptcha）代码实例

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

<!-- 使用Kaptcha生成验证码 -->
  <bean id="captchaProducer" class="com.google.code.kaptcha.impl.DefaultKaptcha">
    <property name="config">
      <bean class="com.google.code.kaptcha.util.Config">
        <constructor-arg>
          <props>
            <prop key="kaptcha.border">yes</prop> 
            <prop key="kaptcha.border.color">105,179,90</prop> 
            <prop key="kaptcha.textproducer.font.color">blue</prop> 
            <prop key="kaptcha.image.width">125</prop> 
            <prop key="kaptcha.image.height">60</prop> 
            <prop key="kaptcha.textproducer.font.size">40</prop> 
            <prop key="kaptcha.session.key">code</prop> 
            <prop key="kaptcha.textproducer.char.length">4</prop> 
            <prop key="kaptcha.textproducer.font.names">宋体,楷体,微软雅黑</prop> 
          </props>
        </constructor-arg>
      </bean>
    </property>
  </bean>

@Autowired
  private Producer captchaProducer = null;
/**
   * 生成验证码
   * @param request
   * @param response
   * @throws IOException
   */
  @RequestMapping("/yzmImg")
  public void yzmImg(HttpServletRequest request,HttpServletResponse response) throws IOException{
    log.info("-----生成验证码-----");
    HttpSession session = request.getSession();
    String preCode = (String)session.getAttribute(Constants.KAPTCHA_SESSION_KEY);
    log.info("-----生成验证码-----前一个验证码："+preCode);
    System.out.println("-----生成验证码-----前一个验证码："+preCode);
    
    //生成验证码
    response.setDateHeader("Expires", 0);
     // Set standard HTTP/1.1 no-cache headers.
    response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
    // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
    response.addHeader("Cache-Control", "post-check=0, pre-check=0");
    // Set standard HTTP/1.0 no-cache header.
    response.setHeader("Pragma", "no-cache");
    // return a jpeg
    response.setContentType("image/jpeg");
    // create the text for the image
    String capText = captchaProducer.createText();
    System.err.println(capText);
    // store the text in the session
    session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
    session.setAttribute(Constants.KAPTCHA_SESSION_DATE, new Date());
    // 存放到缓存服务器上，并把key记录到cookie
    //CodeUtils.creatCode(capText, response, request);
    // create the image with the text
    BufferedImage bi = captchaProducer.createImage(capText);
    ServletOutputStream out = response.getOutputStream();
    // write the data out
    ImageIO.write(bi, "jpg", out);
    try {
      out.flush();
    } finally {
      out.close();
    }
  }

<img src="yzmImg.htm" onclick="getYZMImg()" id="yzmimg">

function getYZMImg(){
  $("#yzmimg").attr("src","yzmImg.htm");
}

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.google.code.kaptcha.Producer' available: expected at least 1 bean which qualifies as autowire candidate. 
Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

@Controller
@Scope("prototype")
@SuppressWarnings("all")
public class IndexController {
}

 java.lang.NoClassDefFoundError: com/jhlabs/image/RippleFilter] with root cause
java.lang.ClassNotFoundException: com.jhlabs.image.RippleFilter