I need to show a graphic image from a byte column in database. Below I have the code for a graphic imagem from a physical path.. how can I do it from a byte column?
<h:panelGrid columns="1" style="width:100%" cellpadding="5">
<p:graphicImage value="/images/cars/test.jpg"/>
</h:panelGrid>
The <p:graphicImage>
supports streaming content. All you need is the following application scoped bean which returns the desired image bytes from the DB based on an unique image identifier as request parameter:
@Named
@ApplicationScoped
public class ImageStreamer {
@EJB
private ImageService service;
public StreamedContent getImage() throws IOException {
FacesContext context = FacesContext.getCurrentInstance();
if (context.getCurrentPhaseId() == PhaseId.RENDER_RESPONSE) {
// So, we're rendering the HTML. Return a stub StreamedContent so that it will generate right URL.
return new DefaultStreamedContent();
} else {
// So, browser is requesting the image. Return a real StreamedContent with the image bytes.
String imageId = context.getExternalContext().getRequestParameterMap().get("imageId");
Image image = imageService.find(Long.valueOf(imageId));
return new DefaultStreamedContent(new ByteArrayInputStream(image.getBytes()));
}
}
}
Here's how you can use it:
<p:graphicImage value="#{imageStreamer.image}">
<f:param name="id" value="#{someBean.imageId}" />
</p:graphicImage>