This is an insightful and well-structured explanation of the Strategy Design Pattern with a practical use case. The article clearly identifies the challenges of a monolithic approach and demonstrates how separating the file parsing logic into strategies improves scalability and maintainability.

The integration with Spring's dependency injection is a particularly nice touch, showing how frameworks can simplify implementing design patterns. The adherence to SOLID principles, especially the Open/Closed Principle, makes the solution future-proof and easy to extend without risking existing functionality.

Overall, this is a great resource for developers looking to write cleaner, more modular code. It would be even better with a discussion on test cases for the strategies and the factory, as testing plays a key role in maintaining such a system. Great work!