SQL Loader http://bit.ly/16tXiol is Database import utility for Oracle.
You can create SQL Loader Script file by using Oracle SQL Developer http://bit.ly/OjdYXF
If you want to run the SQL Loader script from java you can use ProcessBuilder http://bit.ly/YwKvNT to call external jobs as Java processes in ETL like fashion.
More information can be fount here http://oreilly.com/catalog/orsqlloader/chapter/ch01.html