reading data file on any network device from java applet?

how can java applets read data file from any device which is in 开发者_如何学编程same network with client computer

is it possible with signed applets or with any security policy ?

Signed applets do not have the security restrictions that are imposed on unsigned applets and can run outside the security sandbox.

This question is similar, although there aren't many answers.

http://www.roseindia.net/java/example/java/applet/readFileApplet.shtml

here i found a sample application exactly what i want thanks for all answers so there is no need to sign applet because they can read data where they are originated from :)