Re: [Wicket-user] Issue of having a webpage return binary content
For binary output, use a (web)resource. For instance, something like this:
WebResource export = new WebResource() {
@Override
public IResourceStream getResourceStream() {
CharSequence discounts = DataBase.getInstance()
.exportDiscounts();
return new StringResourceStream(discounts, text/plain);
}
@Override
protected void setHeaders(WebResponse response) {
super.setHeaders(response);
response.setAttachmentHeader(discounts.csv);
}
};
export.setCacheable(false);
new ResourceLink(this, exportLink, export);
Eelco
-
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[Wicket-user] Issue of having a webpage return binary content
I need to create a webpage output captcha image to user, actually that is done and work for me to output binary to outputstream. However there is MarkupNotFoundException appear at my log file. I guess I can put a dummy HTML at the classpath, however, can I not doing that but tell wicket don't lookup markup? - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Wicket-user mailing list Wicket-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wicket-user
Re: [Wicket-user] Issue of having a webpage return binary content
Thanks for introducting the class to me, however look like this
missing some object like session and request which I need
In fact I am going to output captcha according to jCaptcha example, it
need request and session as follow. But can I do the same at
WebResource?
public ImageCaptcha() throws ImageFormatException, IOException {
super();
final WebRequest httpServletRequest = (WebRequest)getRequest();
final WebResponse httpServletResponse = (WebResponse)getResponse();
byte[] captchaChallengeAsJpeg = null;
// the output stream to render the captcha image as jpeg into
ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
// get the session id that will identify the generated captcha.
// the same id must be used to validate the response, the
session id is a good candidate!
String captchaId = getSession().getId();
// call the ImageCaptchaService getChallenge method
BufferedImage challenge = new
DefaultManageableImageCaptchaService().getImageChallengeForID(captchaId,
httpServletRequest.getLocale());
// a jpeg encoder
JPEGImageEncoder jpegEncoder =
JPEGCodec.createJPEGEncoder(jpegOutputStream);
jpegEncoder.encode(challenge);
captchaChallengeAsJpeg = jpegOutputStream.toByteArray();
// flush it in the response
httpServletResponse.setHeader(Cache-Control, no-store);
httpServletResponse.setHeader(Pragma, no-cache);
httpServletResponse.setDateHeader(Expires, 0);
httpServletResponse.setContentType(image/jpeg);
OutputStream responseOutputStream =
httpServletResponse.getOutputStream();
responseOutputStream.write(captchaChallengeAsJpeg);
responseOutputStream.flush();
responseOutputStream.close();
}
On 11/22/06, Eelco Hillenius [EMAIL PROTECTED] wrote:
For binary output, use a (web)resource. For instance, something like this:
WebResource export = new WebResource() {
@Override
public IResourceStream getResourceStream() {
CharSequence discounts = DataBase.getInstance()
.exportDiscounts();
return new StringResourceStream(discounts, text/plain);
}
@Override
protected void setHeaders(WebResponse response) {
super.setHeaders(response);
response.setAttachmentHeader(discounts.csv);
}
};
export.setCacheable(false);
new ResourceLink(this, exportLink, export);
Eelco
-
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Re: [Wicket-user] Issue of having a webpage return binary content
You can always do RequestCycle.get() (or
((WebRequest)RequestCycle.get())) to get the current request cycle, on
which you can then call get(Web)Request and get(Web)Response
Eelco
On 11/21/06, Carfield Yim [EMAIL PROTECTED] wrote:
Thanks for introducting the class to me, however look like this
missing some object like session and request which I need
In fact I am going to output captcha according to jCaptcha example, it
need request and session as follow. But can I do the same at
WebResource?
public ImageCaptcha() throws ImageFormatException, IOException {
super();
final WebRequest httpServletRequest = (WebRequest)getRequest();
final WebResponse httpServletResponse = (WebResponse)getResponse();
byte[] captchaChallengeAsJpeg = null;
// the output stream to render the captcha image as jpeg into
ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
// get the session id that will identify the generated captcha.
// the same id must be used to validate the response, the
session id is a good candidate!
String captchaId = getSession().getId();
// call the ImageCaptchaService getChallenge method
BufferedImage challenge = new
DefaultManageableImageCaptchaService().getImageChallengeForID(captchaId,
httpServletRequest.getLocale());
// a jpeg encoder
JPEGImageEncoder jpegEncoder =
JPEGCodec.createJPEGEncoder(jpegOutputStream);
jpegEncoder.encode(challenge);
captchaChallengeAsJpeg = jpegOutputStream.toByteArray();
// flush it in the response
httpServletResponse.setHeader(Cache-Control, no-store);
httpServletResponse.setHeader(Pragma, no-cache);
httpServletResponse.setDateHeader(Expires, 0);
httpServletResponse.setContentType(image/jpeg);
OutputStream responseOutputStream =
httpServletResponse.getOutputStream();
responseOutputStream.write(captchaChallengeAsJpeg);
responseOutputStream.flush();
responseOutputStream.close();
}
On 11/22/06, Eelco Hillenius [EMAIL PROTECTED] wrote:
For binary output, use a (web)resource. For instance, something like this:
WebResource export = new WebResource() {
@Override
public IResourceStream getResourceStream() {
CharSequence discounts = DataBase.getInstance()
.exportDiscounts();
return new StringResourceStream(discounts, text/plain);
}
@Override
protected void setHeaders(WebResponse response) {
super.setHeaders(response);
response.setAttachmentHeader(discounts.csv);
}
};
export.setCacheable(false);
new ResourceLink(this, exportLink, export);
Eelco
-
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Re: [Wicket-user] Issue of having a webpage return binary content
Thanks, in fact I get a even nicer way generate image, which is just
use Image() object from wicket, thanks everyone
On 11/22/06, Eelco Hillenius [EMAIL PROTECTED] wrote:
You can always do RequestCycle.get() (or
((WebRequest)RequestCycle.get())) to get the current request cycle, on
which you can then call get(Web)Request and get(Web)Response
Eelco
On 11/21/06, Carfield Yim [EMAIL PROTECTED] wrote:
Thanks for introducting the class to me, however look like this
missing some object like session and request which I need
In fact I am going to output captcha according to jCaptcha example, it
need request and session as follow. But can I do the same at
WebResource?
public ImageCaptcha() throws ImageFormatException, IOException {
super();
final WebRequest httpServletRequest = (WebRequest)getRequest();
final WebResponse httpServletResponse = (WebResponse)getResponse();
byte[] captchaChallengeAsJpeg = null;
// the output stream to render the captcha image as jpeg into
ByteArrayOutputStream jpegOutputStream = new
ByteArrayOutputStream();
// get the session id that will identify the generated captcha.
// the same id must be used to validate the response, the
session id is a good candidate!
String captchaId = getSession().getId();
// call the ImageCaptchaService getChallenge method
BufferedImage challenge = new
DefaultManageableImageCaptchaService().getImageChallengeForID(captchaId,
httpServletRequest.getLocale());
// a jpeg encoder
JPEGImageEncoder jpegEncoder =
JPEGCodec.createJPEGEncoder(jpegOutputStream);
jpegEncoder.encode(challenge);
captchaChallengeAsJpeg = jpegOutputStream.toByteArray();
// flush it in the response
httpServletResponse.setHeader(Cache-Control, no-store);
httpServletResponse.setHeader(Pragma, no-cache);
httpServletResponse.setDateHeader(Expires, 0);
httpServletResponse.setContentType(image/jpeg);
OutputStream responseOutputStream =
httpServletResponse.getOutputStream();
responseOutputStream.write(captchaChallengeAsJpeg);
responseOutputStream.flush();
responseOutputStream.close();
}
On 11/22/06, Eelco Hillenius [EMAIL PROTECTED] wrote:
For binary output, use a (web)resource. For instance, something like this:
WebResource export = new WebResource() {
@Override
public IResourceStream getResourceStream() {
CharSequence discounts = DataBase.getInstance()
.exportDiscounts();
return new StringResourceStream(discounts, text/plain);
}
@Override
protected void setHeaders(WebResponse response) {
super.setHeaders(response);
response.setAttachmentHeader(discounts.csv);
}
};
export.setCacheable(false);
new ResourceLink(this, exportLink, export);
Eelco
-
Take Surveys. Earn Cash. Influence the Future of IT
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your
opinions on IT business topics through brief surveys - and earn cash
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