JAI + JSP

Question

Hello.
I want to get the height of a image in a jsp with jai, but I am always getting:
javax.servlet.ServletException
     org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:848)
     org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:781)
     org.apache.jsp.imp_jsp._jspService(imp_jsp.java:244)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)my code is:
<%@page import= "javax.media.jai.JAI"%>
<%@page import= "java.awt.image.RenderedImage"%>
<%@page import= "java.net.URL"%>
<%@page import= "javax.media.jai.JAI"%>
URL url = new URL("http://images.amazon.com/images/P/B0009XTX5G.01.LZZZZZZZ.jpg");               
RenderedImage image = JAI.create("url", url);Thanks

Answer 1

Hello,
I had the same problem few months ago ( in that case i used Jimi instead of JAI).
The answer to your question is: use the java class called "Image".
Infact you can use JAI just for load or save to disk your image that you have to resize and then use the following code to resize the image :
Image imgResized = img.getScaledInstance(100,1,Image.SCALE_AREA_AVERAGING);
The object "img" is the image to resize and the object "imgResized" is the image resized with width equals to 100 and with a right height.
I used Jimi just to save my image and i think that with JAI there is a method to do this.
You can use JAI to load in memory your image too so you can avoid problem with MediaTraker class.
I hope that this can help you.
Cheers.
Stefano