Mastering the Strategy Pattern in Spring: A Step-by-Step Guide

Background

Developers frequently use the Strategy pattern in real‑world projects.

Learning Objective

Learn how to apply the Strategy pattern within a Spring application.

Code Example

Below are visual examples of a query business using the Strategy pattern.

Implementation of Query Business A:

Implementation of Query Business B:

Implementation of Query Business C:

Invocation Class (Three Parts)

Inject a list of sub‑query business objects

Set input parameters

Iterate over subclasses, verify, then invoke processing logic

Spring Configuration File Explanation

This illustrates the application of the Strategy pattern via a Spring configuration file.

Map‑Based Strategy Example

The map strategy uses a key/value configuration; steps 1 and 2 are identical, while step 3 performs a single call instead of a loop.

Run Result

Java simulation of the calls: