Applets and reading files...

[ted holden]

Does anybody have any idea what it might take to allow an applet to read a
local file? This is for a simple demo which would not involve anything
other than a laptop computer which was not connected to anything other than
electricity.

I've used policytool.exe to set a read permission on the file in question
and I've included the file's directory in the java classpath and nothing
seems to help, I still get the same access permission error.

 

[Bob]

Does anybody have any idea what it might take to allow an applet to read a
local file? This is for a simple demo which would not involve anything
other than a laptop computer which was not connected to anything other than
electricity.

I've used policytool.exe to set a read permission on the file in question
and I've included the file's directory in the java classpath and nothing
seems to help, I still get the same access permission error.

Are you able to read the file okay if you use an application rather than
an applet?

All I remember about applets is that they are severely restricted, to
stop the sort of exploits that ActiveX was famous for.

 

[Lee Ryman]

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Does anybody have any idea what it might take to allow an applet to read a
local file? This is for a simple demo which would not involve anything
other than a laptop computer which was not connected to anything other than
electricity.

I've used policytool.exe to set a read permission on the file in question
and I've included the file's directory in the java classpath and nothing
seems to help, I still get the same access permission error.

Unfortunately you have to do a bit more than that

The applet and its .policy file need to be in a .jar file which is
signed with a certificate from yourself/your company. Googling "signing
applets" gives some appropriate references. In particular this Google
result...

http://java.sun.com/developer/technicalArticles/Security/Signed/

... isn't a bad place to start. Remember grasshopper, STFW.

Regards,

Lee
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