问题
I know Flash can use ExternalInterface to call Javascript functions but I don't know if it can call applet also like that. Maybe it can be done by SWF -> JS -> Applet, and back, I don't know. Since I have no idea how to do applets, I would also appreciate at least some pseudo code. Thanks.
回答1:
Applets can communicate with JS, and JS can control applets. See these examples of Java/JavaScript interaction.
回答2:
Yes. Sockets. Your Java applet can open a server socket, probably a HTTP socket, and Flash/Flex can post content to the socket. Your applet will have to be signed by a known CA to be trusted, but once that's done you can pretty much do what you want.
来源：https://stackoverflow.com/questions/8032248/can-flash-swf-communicate-with-java-applet-and-vice-versa-in-any-way