u can use ODBC driver or OCi driver that can be downloaded from the net. Follow the documentation present in the download to esablish the Connection
The ODBC driver is not recommended since there are limited features available. Oracle supports a lot more features than what the bridge driver could. The OCI driver requires an Oracle client installation (i.e. native libraries). There is a type 4 driver (pure Java) available for Oracle [classes12.jar or ojdbc.jar depending on the version] which could be used.