Sounds like your best approach is to just fetch the raw bytes and send them on, rather than try to parse the bytes into an Image and then encode the Image back to bytes. If you want to make edits to the picture, then the techniques in Chapter 6 will be handy (like on p. 181 where I talk about the exact limitation you're hitting).
-jh- John C Cartwright wrote: > > Thanks for your reply, Jason - it certainly put me on the right track. > I'm still having some trouble trying to encode the Image as a JPEG. > > It seems that the JPEGImageEncoder.encode() will only accept > BufferedImage objects and that the > Toolkit.getDefaultToolkit().getImage() only returns Image objects. I > expected to be able to cast the Image to a BufferedImage but that causes > the servlet to throw an exception. > > The only way, I've been able to deal with the situation is to create a > new BufferedImage the same size as the original image and then draw the > original image into that and encode it. Surely there must be a better > way! Can you help me out again? > > Thanks! > > -- john > > Jason Hunter wrote: > > > Hmm, I thought I talked about this in the book. If you want to send > > images you have to send them in an encoded form (GIF, JPEG, TIFF, PNG, > > etc). So in your case, either your servlet has to retrieve just the > > image bytes from the other server and pass them on to the client > > (keeping them encoded), or if you servlet has to get the image as a > > java.awt.Image object then it has to encode it before sending it to the > > client. > > > > Glad you liked the book. :-) > > > > -jh- > > > > John C Cartwright wrote: > > > >>Hello All, > >> > >>I'm trying to build a simple servlet that will provide images to an > >>applet. Essentially trying to get around the applet's limitation of > >>only reading files from it's host. > >> > >>I started with the example in Chapter of Jason Hunter's "Java Servlet > >>Programming" (excellent book, by the way!). The servlet reads an image > >>from a URL into an java.awt.image object. The applet then retrieves > >>that object from the servlet using com.oreilly.servlet.HttpMessage class. > >> > >>The applet is throwing a java.io.FileNotFoundException, but experiments > >>lead me to believe that the problem is due to the fact that the > >>java.awt.Image class does not implement serializable interface. > >>The servlet can correctly determine the width and height of the image > >>and successfully transfer that information to the applet as a String object. > >> > >>So, is there a better way to achieve my objective than to transfer an > >>java.awt.Image object from the servlet to the applet? Does the object > >>being transferred have to be serializable? > >> > >>Thanks for your help! > >> > >>-- john > >> > >>-- > >>===================================================== > >>John Cartwright > >>Professional Research Assistant / Associate Scientist > >>CIRES, SEG/NGDC/NOAA > >>(303) 497-6284 > >>[EMAIL PROTECTED] > >>===================================================== > >> > >>___________________________________________________________________________ > >>To unsubscribe, send email to [EMAIL PROTECTED] and include in the body > >>of the message "signoff SERVLET-INTEREST". > >> > >>Archives: http://archives.java.sun.com/archives/servlet-interest.html > >>Resources: http://java.sun.com/products/servlet/external-resources.html > >>LISTSERV Help: http://www.lsoft.com/manuals/user/user.html > >> > > > > ___________________________________________________________________________ > > To unsubscribe, send email to [EMAIL PROTECTED] and include in the body > > of the message "signoff SERVLET-INTEREST". > > > > Archives: http://archives.java.sun.com/archives/servlet-interest.html > > Resources: http://java.sun.com/products/servlet/external-resources.html > > LISTSERV Help: http://www.lsoft.com/manuals/user/user.html > > > > > > > > -- > ===================================================== > John Cartwright > Professional Research Assistant / Associate Scientist > CIRES, SEG/NGDC/NOAA > (303) 497-6284 > [EMAIL PROTECTED] > ===================================================== > > ___________________________________________________________________________ > To unsubscribe, send email to [EMAIL PROTECTED] and include in the body > of the message "signoff SERVLET-INTEREST". > > Archives: http://archives.java.sun.com/archives/servlet-interest.html > Resources: http://java.sun.com/products/servlet/external-resources.html > LISTSERV Help: http://www.lsoft.com/manuals/user/user.html ___________________________________________________________________________ To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff SERVLET-INTEREST". Archives: http://archives.java.sun.com/archives/servlet-interest.html Resources: http://java.sun.com/products/servlet/external-resources.html LISTSERV Help: http://www.lsoft.com/manuals/user/user.html
