​How to Gracefully Load Configuration Files in Spring Boot? These Methods Are a Must-Know!

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In the realm of project development, we often need to extract certain variables from the code and place them into configuration files for more convenient and flexible management of service configurations.

It’s like organizing kitchen utensils into different drawers — when needed, everything is clear at a glance, saving the hassle of rummaging through chaos.

Today, let’s dive into several approaches to loading configuration files in Spring Boot and explore how to make our project configurations more elegant.

​Spring Boot’s “Default Loading Order”

When Spring Boot starts, it searches for configuration files in a specific order, much like how we look for our phones in the morning 😄 — first checking the bedside, then the table, and finally rummaging through drawers…

The order is as follows:

1. First, it looks for bootstrap.properties or bootstrap.yml. These files have the highest priority, much like our "morning routine," always considered first.
2. Next, it searches for application.properties or…