You're going to want to read the docs. There are classes that aren't allowed, and ImageIO isn't on the class whitelist. Instead, you'll want to use the images API:
http://code.google.com/appengine/docs/java/images/ If you're looking to build a captcha, you should probably use something like reCaptcha instead: http://code.google.com/apis/recaptcha/intro.html -- Ikai Lan Developer Programs Engineer, Google App Engine plus.ikailan.com | twitter.com/ikai On Mon, Aug 8, 2011 at 4:16 AM, cpuzer <[email protected]> wrote: > With stand SUN JAVA runtime,a JSP page can output images steam like > the: > <%@ page contentType="image/jpeg" import="javax.imageio.ImageIO, > > javax.servlet.ServletOutputStream, > java.awt.*, > > java.awt.image.BufferedImage, > java.io.IOException, > java.util.Random" %> > > But in google app engine runtime,Some class aren't in google's > whilelist,who can tell me how to output imaes( Like Verification code) > whith Java? > > HRLP,HELP!!! > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
