🚀 go-pugleaf

I have a related question.  I have an applet that uses the java.net.Socket
class.  It runs OK in Netscape but for it to run in IE I need to set the
security level to "Low".  I'm opening a socket to a port on the same machine
from which I load the web page/applet.

Is there a way for me to get this to run in the "Medium" level (I'm running
IE 5.0 by the way).




Daniel J. Woods <dwoods@gssec.bt.co.uk> wrote in message
news:39928C32.EDAD2338@gssec.bt.co.uk...
> Applets can't use file I/O on the host machine unless they've been
> expressly given permission to do so using digital signatures (a lengthy
> process I'm none too keen on). The rationale behind this comes from the
> fact that applets are essentially untrusted code which is downloaded
> from some remote source and run on your browser--not something you want
> to be snooping around your hard-drive (potentially deleting whatever it
> wants).
>
> Aside from the digital signatures thingy, applets can only load files
> from the server from which it was downloaded. This involves establishing
> a connection to the server a la:
> ...
> URL myFile;
> InputStream fileStream;
>
> try {
>   myFile = new URL(getCodeBase(),"somefile.whatever");
> } catch(MalformedURLException murle) {
>   // exception handling stuff
> }
>
> try {
>   fileStream = myFile.openStream();
>   // other stuff like reading
> } catch(IOException ioe) {
>   // more exception handling stuff
> }
>
> etc.
>
> The important thing to remember is that the applet was (presumably)
> downloaded from some Web-server somewhere, and that it doesn't have
> access to the user's PC at all--only resources on the server are
> available.
>
> Hope that's useful,
>
> Danny.
>
> P.Goovaerts@Clipper.Be wrote:
>
> >
> > We are new in the Java world and agree that this is a very powerfull
> > language but ...  how the ... do you learn it ?  We are stuck under
> > lots of books, url's, newsgroups,... where is the time you bought an
> > RPG / COBOL book and started to program ...
> >
> > OK, after a couple of weeks we are able to create little 'stand alone'
> > Java programs wich runs fine on our PC.  The application(s) retrieves
> > records from the AS400 using DPC and displays them on screen.  Then we
> > changed them into an applet by adding (extends JAPPLET) and replacing
> > the main() method by init() method.  All neccessary classes and images
> > are stored on AS400Webfolder.  (We didn't pack them in a Jar file).
> >
> > Compile give no error but when calling URL in browser, following
> > happens :
> > - jt400.jar file loads (archive=jt400.jar in htmldoc)
> > - message is shown that Class xxxx is not found.
> >
> > Then I call same applet with appletviewer and following occurs :
> >
> > - AccessControlException occurs with following details:
> >
> > C:\WINDOWS>appletviewer http://s44a5189:2021/BH_HTTP/Conti.html
> > java.security.AccessControlException: access denied
> > (java.io.FilePermission butt
> > o61c.gif read)
> >        at
> > java.security.AccessControlContext.checkPermission(AccessControlConte
> > xt.java:195)
> >        at
> > java.security.AccessController.checkPermission(AccessController.java,
> > Compiled Code)
> >        at
> > java.lang.SecurityManager.checkPermission(SecurityManager.java, Compi
> > led Code)
> >        at
> > java.lang.SecurityManager.checkRead(SecurityManager.java:873)
> >        at sun.awt.SunToolkit.getImageFromHash(SunToolkit.java:242)
> >        at sun.awt.SunToolkit.getImage(SunToolkit.java:256)
> >        at javax.swing.ImageIcon.<init>(ImageIcon.java:64)
> >        at javax.swing.ImageIcon.<init>(ImageIcon.java:83)
> >        at Conti.<init>(Conti.java:54)
> >        at java.lang.Class.newInstance0(Native Method)
> >        at java.lang.Class.newInstance(Class.java:241)
> >        at sun.applet.AppletPanel.createApplet(AppletPanel.java:517)
> >        at sun.applet.AppletPanel.runLoader(AppletPanel.java:453)
> >        at sun.applet.AppletPanel.run(AppletPanel.java:291)
> >        at java.lang.Thread.run(Thread.java:479)
>
> --
> Danny Woods
> Software Engineer
> BT CDMC Data Quality
> -- Unless otherwise stated, what's in this mail is purely my opinion,
> -- not that of BT.
>
>
>