java.util.prefs: storing the preferences somewhere else

[Veerle]

Hi,

I would like to implement a subclass of the Preferences class that
doesn't store everything into the Windows registry, but in an xml
file. Does anyone have example code of
- a subclass of the Preferences class
- an implementation of PreferencesFactory for this Preferences class
- an implementation of both the listeners for this Preferences class
- and a small example program that uses the above?
This would be a great help when starting out my own implementation...
This sample code doesn't have to store the preferences in an xml file,
any other location than the Windows registry will do, it's just to get
an idea of how to start of with my own thing.

Thanks in advance,
Veerle

 

[Daniel Dyer]

Hi,

I would like to implement a subclass of the Preferences class that
doesn't store everything into the Windows registry, but in an xml
file. Does anyone have example code of
- a subclass of the Preferences class
- an implementation of PreferencesFactory for this Preferences class
- an implementation of both the listeners for this Preferences class
- and a small example program that uses the above?
This would be a great help when starting out my own implementation...
This sample code doesn't have to store the preferences in an xml file,
any other location than the Windows registry will do, it's just to get
an idea of how to start of with my own thing.

Thanks in advance,
Veerle

Well the Linux version of the JRE stores preferences in an XML file under
the user's home directory, so it might be worth investigating that. I
don't know if there's some property you can set to get it to behave this
way on Windows. If not, you can probably take a look in the source for
the Linux version and get some ideas from that.

 

[Roedy Green]

Well the Linux version of the JRE stores preferences in an XML file under
the user's home directory, so it might be worth investigating that. I
don't know if there's some property you can set to get it to behave this
way on Windows. If not, you can probably take a look in the source for
the Linux version and get some ideas from that.

There is a problem with Windows and JNLP in that you don't get
assigned a directory to work in. There is no natural place to put
your file. You will have to invent some file-naming convention and
tree-like directory structure to store the preferences. Again you
might take a lead from how they pull it off in Linux.

 

[Phil...]

make an output stream and use method exportNode()
it will output in xml format