Hi,
to save a file to the Client from an Applet you have to sign all jars used
by that applet.
Or if you are using Java 6 Update 10 or later, you can use some features of
Java Web Start even from applets, and use its Persistence (but in this case
files will be saved/loaded from a fixed location of the disk, and not from
where you want, so maybe this could not be the best solution for you).

Some references (not exact on this, but useful to can get more infos on this
feature):
http://www.java-forums.org/java-applets/17779-java-applet-save-file.html
http://forums.sun.com/thread.jspa?threadID=5444573

in Internet you can find many examples for this ... with Applets this is a
common feature to have


Or you can try to see for your case, if could be useful to deploy as an
application (not as applet) with Java Web Start (and maybe add a security
all-permissions tag in jnlp deployment descriptor), so for example you can
even work off-line.


> I was thinking of asking a web service to generate the content and reply
> with the URI with the generated file, but this would consume resources on
> my server and since I'm running in the client I would like to take
> advantage of that. 
Yes, it depends on what you have to do to generate your content, but if you
have all data already on client, probably it's better to generate files on
client too.
Suggestion: think to put something on the server-side to trust/validate
client side data (or client-side content) ... could be useful, depend on the
type of data you have to manage. 
And I'm a bit paranoid about these things :-) .


Tell if you need more info.

Bye,
Sandro

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