using applet to establish link between client and server

Applets are not allowed to open network connections to any computer, except for the host that provided the .class files. This is either the host where the html page came from, or the host specified in the codebase parameter in the applet tag, with codebase taking precendence.

For example, if you try to do this from an applet that did not originate from the machine foo.com, it will fail with a security exception:

Socket s = new Socket("foo.com", 25, true);

you can further look at this link
http://java.sun.com/sfaq/#socket

The only other way is to
 Use a proxy (a program operating on behalf of another) on the Web server host, and let this program redirect the communication to the remote host.

not sure if it will work in all cases

you can refer to this link for setting up a proxy
http://www.ifi.uio.no/~ftp/publications/cand-scient-theses/SHuseby/html/node35.html#SECTION00810000000000000000

Or sign your applet, this will allow it to connect to any host.

Hi objects.....what you mean by sign my applet??

A signed applet is one that's source and integrity are guaranteed by its author. This is done by attaching a digital signature to it indicating it's creator.

Hi

this might be of help:

An applet in a jar is signed by analyzing the classes and data in the jar and calculating some relatively unique numbers based on the analysis. These numbers are then stored in some extra files added to the applet jar.

When the browser (or Java Plug-in) runs the applet, it notices the extra files, runs the same analysis on the applet content and compares its results with those stored in the extra files. If they match, it is VERY unlikely that the applet has been modified since signing. The analyses done are carefully chosen so that even small changes to any of the applet's content would produce different analysis results.

So, an applet is signed when the applet jar contains signature information and that information correctly matches the other contents in the jar.




you can refer to these links to know
more about signed applets



http://www.suitable.com/Doc_CodeSigning.shtml


http://www.sas.com/rnd/appdev/tech/signing/RSASigning.htm

thank you sanjay thakur.....I will try it....thanks a lot

No comment has been added lately, so it's time to clean up this TA.

I will leave a recommendation in the Cleanup topic area that this question is:

- points to objects (12/12/2001 08:48PM PST)

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girionis
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