You will have to use the UTL_FILE package.
Here's another page with information and examples:
UTL_FILE: Reading and Writing Server-side Files
in server’s file system
KERMANI: do you want to store the file in the database, or in the database server’s file system (to read it from a database application) ?
KERMANI: do you want to store the file in the database, or in the database server’s file system (to read it from a database application) ?