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
> > >
> > > -
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> > > ___
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> > >
> >
> > -
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> >
>
> -
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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
> >
> > -
> > 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.php&p=sourceforge&CID=DEVDEV
> > ___
> > Wicket-user mailing list
> > Wicket-user@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/wicket-user
> >
>
> -
> 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
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> ___
> Wicket-user mailing list
> Wicket-user@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/wicket-user
>
-
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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
>
> -
> 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.php&p=sourceforge&CID=DEVDEV
> ___
> Wicket-user mailing list
> Wicket-user@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/wicket-user
>
-
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opinions on IT & business topics through brief surveys - and earn cash
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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.php&p=sourceforge&CID=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
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
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.php&p=sourceforge&CID=DEVDEV
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