The way I do this is to dynamically control caching on the CLIENT. Some clients have one cache time and others have a different time. Also, for different images, you can use different caching times on the same client. There are lots of ways to fry this fish.
On 9/27/05, Frank W. Zammetti <[EMAIL PROTECTED]> wrote: > The Wiki is your friend: > > http://wiki.apache.org/struts/StrutsFileDownload > > Specifically, you will be interested in the downloadapp.zip sample I > posted there... it has an example of serving a BLOB from a database. All > you need to do is have a mapping to this Action, and use it as the src > attribute of an <img> tag. > > As another poster said though, there is definitely a fair amount of > overhead to doing this. That being said, I've done it to good effect on > at least two occassions. But, you do have to think about whether it is > appropriate... in my case, it was a client's logo in a frame that only > changed when the user changed clients, very infrequent. I can't imagine > I'd serve images from a database if it was going to be needed a lot... I'd > have to have an exceptionally good reason for doing it. Maybe you do :) > In any case, that sample app should show you how. > > Note too that even if you aren't using a version of Struts with the > DownloadAction, what's there is still somewhat applicable, and there's > nothing to stop you from bringing DownloadAction over to your app anyway > AFAIK. > > -- > Frank W. Zammetti > Founder and Chief Software Architect > Omnytex Technologies > http://www.omnytex.com > > On Tue, September 27, 2005 12:23 pm, Braun, James F said: > > Goal: Read a blob image from an Oracle database and render it on an html > > page using the struts framework. > > > > I've never found a good way to do this and I was hoping someone had a > > "best practice" suggestion. > > > > I have no trouble getting the image from the database. However, I wonder > > if there isn't a better way to display it rather than writing it to a > > physical file and then rendering it. I'm using the <html:img tag to > > display the image now. > > > > All help appreciated. > > > > J. > > > > ImputStream pictureStream; > > ResultSet rs; > > > > // create the query and execute it ... > > > > // get the result > > pictureStream = rs.getBinaryStream("picture"); > > > > // I can write it to a physical file > > File pictureFile = new File("/temp/picture.jpg"); > > > > try > > { > > FileOutputStream out = new FileOutputStream(pictureFile); > > int chunk = 0; > > while( (chunk = pictureStream.read()) != -1) > > { > > out.write(chunk); > > } > > out.close(); > > out.flush(); > > } > > catch(FileNotFoundException ex) > > { > > System.err.println("selectionForm.populate.picturefile: " + > > ex.getMessage()); > > logger.error("selectionForm.populate.picturefile: " + > > ex.getMessage()); > > } > > catch(IOException ex) > > { > > System.err.println("selectionForm.populate.picturefile: " + > > ex.getMessage()); > > logger.error("selectionForm.populate.picturefile: " + > > ex.getMessage()); > > } > > > > -- > > This transmission is intended only for use by the addressee(s) named > > herein and may contain information that is proprietary, confidential > > and/or legally privileged. If you are not the intended recipient, you are > > hereby notified that any disclosure, copying, distribution, or use of the > > information contained herein (including any reliance thereon) is STRICTLY > > PROHIBITED. If you received this transmission in error, please immediately > > contact the sender and destroy the material in its entirety, whether in > > electronic or hard copy format. Thank you. > > > > > > > > --------------------------------------------------------------------- > > 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] > > -- "You can lead a horse to water but you cannot make it float on its back." ~Dakota Jack~ --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
