Hi I am able to reload the captcha image in the following way(Using JCaptcha)
package com.sybase365.mobiliser.web.consumer.pages.signup;
1>Write a class for dynamic image as follows.
public abstract class CaptchaImage extends NonCachingImage {
public CaptchaImage(String id, final String challengeId) {
super(id);
setImageResource(new DynamicImageResource() {
protected byte[] getImageData() {
ByteArrayOutputStream os = new ByteArrayOutputStream();
String challengeId = String.valueOf(System.currentTimeMillis());
BufferedImage challenge = getImageCaptchaService()
.getImageChallengeForID(challengeId,
Session.get().getLocale());
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
try {
encoder.encode(challenge);
return os.toByteArray();
} catch (Exception e) {
throw new RuntimeException(e);
}
} }); }
protected abstract ImageCaptchaService getImageCaptchaService();
}
2> add it to form and provide a link to refresh it
img = generateCaptcha();// see this code in 3rd step
form.add(img);
form.add(new AjaxLink("captchLink") {
@Override
public void onClick(AjaxRequestTarget target) {
// counter++;
// target.addComponent(generateCaptcha());
target.addComponent(form.replace(generateCaptcha()));
}
});
3>public NonCachingImage generateCaptcha() {
String challengeId = String.valueOf(System.currentTimeMillis());
img = new CaptchaImage("captchaImage", challengeId) {
@Override
protected ImageCaptchaService getImageCaptchaService() {
return captchaService;
}
};
img.setOutputMarkupId(true);
return img;
}
4> html
<p> </p>
# click me
5> Don't forget to add the following in application-context.xml if u r using
spring injection
<bean
class="com.octo.captcha.service.image.DefaultManageableImageCaptchaService"
id="imageCaptchaService"/>
For any queries mail me [email protected]
Thanks
Praveen Homkar
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