Marc, If you have performance problems, here is a suggestion:
Keep an index in your application scope that has the totals (since load-time) of how many times each item has been displayed. Then, keep copies of the top 50 on-disk. That way, if the image is one of your top-50, you don't need the database but can simply open the disk file and read/print it for speed on your most-used ones and only remove the temp files you made for the less frequently used ones. Regards, David -----Original Message----- From: Marc AMIR-TAHMASSEB [mailto:[EMAIL PROTECTED] Sent: Wednesday, November 12, 2003 9:59 AM To: Struts Users Mailing List Subject: Re: Dynamic Image from DB to JSP Dear Hubert and David, thanks for your help. Finaly i did like this : in my jsp a create a image tag as : <img src="loadImage.do?id=<%=Integer.toString(image.getId())%>" > loadImage.do create first a Java Temporary File (File.createTempFile) containing the bytes of the image comming from the DB. Then it generates a "document" with the appropriate content type (that i stored before) and i push the image bytes[] to the response like this : response.setContentType("image/pjpeg"); response.setHeader("Content-Disposition", "filename="+img.getName()); response.setHeader("Cache-Control", "no-cache"); response.setContentLength((int)img.length()); OutputStream ou = response.getOutputStream(); FileInputStream in = new FileInputStream(img); byte[] buffer = new byte[(int)img.length()]; in.read(buffer); ou.write(buffer); ou.flush(); ou.close(); in.close(); img.delete(); img.deleteOnExit(); Regards, Marc David Friedman wrote: >Marc, > >That's a tricky one I've planned for but haven't started yet. My research >showed the html:img tag should be used with a path. That path can invoke an >action (direct, not tiled) that sets the content-type to the right type of >image then tosses out the binary stream. So, it should be something like >this: > >html:write get a URL such as "/images.do?id=555" or >"http://somehost/images.do?id=555";. Then your map an action for "/images" >to set the content type, open the database, and print the binary stream >appropriately. Sounds a bit list an advertising program, almost. :) > >If something else works for you, please let me know as this is type of image >display is on my to-do list. > >Regards, >David > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
