Copying Oracle 11g express Database from one server to another
You do not state which version you use, so I assume you use version 10.x or 11.x.

Do a full export of your database using Oracle Data Pump, existing since Oracle 10: expdp (export dump) and then re-import it into another database using impdb (import dump).

Use expdp help=y to get the full set of parameters. Parameters are given in the form param=value, not --param=value as one would expect.