Hello,
I want to show a BufferedImage on a JSF-generated page. In my case, this Image
is generated by the JFreeChart[1] library. Now my question:
What must I do, that I can show this image as a graphic on a JSF Page?
I try to use normal <h:graphicImage > tag with a url attribute which points to
another jsf site. This jsf site as the content/type "image/jpeg" and calls a
BackingBean which generates a BufferedImage Objekt. This Object is writen to
the outputstream of the response Object. It works nearly fine. The Image is
correctly generated and shown in the Webbrowser. But on the servers console is
a exception thrown:
15:09:10,184 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception
java.lang.IllegalStateException: getOutputStream() has already been called for
this response
I hope you understand my bad english!
Here is the part of the JSF-Page, which shows the Image:
<h:graphicImage
alt="testDiagramm"
width="800"
height="600"
url="createChart.jsf"/>
And the createChart.jsf:
<%@ page contentType="image/jpeg" %>
...
<%
FacesContext context = FacesContext.getCurrentInstance();
Application app = context.getApplication();
BufferedImage image = (BufferedImage)
app.createMethodBinding("#{chartCreator.generateTestChart}",
null).invoke(context, null);
ServletOutputStream sos = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder( sos );
encoder.encode( image );
%>
Thanks a lot!
[1] http://www.jfree.org/jfreechart/
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