Mastering the Strategy Pattern in Spring: Real-World Java Examples

Background

Developers frequently use the Strategy pattern in real projects.

Learning Objectives

Apply the Strategy pattern in a Spring project.

Code Example

Below is a case of a query business using the Strategy pattern.

Specific implementations for query business A, B, and C are illustrated with images.

Query Business A implementation

Query Business B implementation

Query Business C implementation

Subquery Business Invocation Class (Three Parts)

Inject a list of subquery business objects.

Set input parameters.

Iterate over the list, validate each, and invoke processing logic.

Spring Configuration File Explanation

This demonstrates the application of the Strategy pattern.

List Strategy Pattern and Map Example

The following shows a map‑based Strategy pattern where the third step is a single call instead of iteration.