Is it possible to set JDBC Driver CharacterSet

HI,
I'm trying to learn how the data conversion is being handled in oracle (ii.e, I wanted to check the behaviour by keeping orai18n.jar & removing it). My database character set is WE8ISO8859P1, and I would like to change different client side character sets & do some R&D related to my application.
So I want to know ....
->if we can set JDBC Driver Character set in any way.
->Is setting client character set is what is setting driver character set??
We are using Oracle 10g and getting connections using Datsource. When I try to get the driver character set using oracle.jdbc.driver.OracleConnection.getJdbcCsId(), it returns 31 (which is WE8ISO8859P1).But I didn't find any setter..or similar method.
I'm new to this Globalization thing.... so sorry if I'm asking dumb questions.... Could any one help me in this regard?? .
Thanks,

JDBC is not designed to support the notion of a driver character set. Any text data should be retrieved using ResultSet.getString() method and passed to the database using PreparedStatement.setString() method - except for CLOBs, which also accept Unicode character streams. These methods expect string data in Java Unicode encoding (UTF-16). If you need to output this data from an application is some other encoding, you should use standard Java conversion mechanisms - e.g. String.getBytes(charset) or new PrintWriter(file,charset).
The driver character set is an internal setting relevant for intermediate character set conversions between the driver and the database. It is determined automatically by the driver based on the database character set. The method oracle.jdbc.driver.OracleConnection.getJdbcCsId() is undocumented and should not be used.
-- Sergiusz

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