As Java Database Connectivity provides the facility to manage record in a database by using its API and drivers. Provide implementation in java for a GUI based resource management system and cover up following key points:

1. Prepare some basic guide on how you can import an external library / resource to your java project
2. Implement JDBC connectivity
3. Implementation to list out all records in a data table from database
4. Allow the users to export list of records to an excel file in CSV / XLSX format