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Springboot configuration file loading order

1. Background

SpringBoot's configuration file can set a value for the specified key in the environment variable. When the program runs, it obtains the value from the environment through the key, so that it can control the program's running effect by changing the value of the configuration file, and realize business logic.

2. Location of configuration file

  1. ./
  2. ./config/
  3. ./config/*/
  4. resources/
  5. resources/config/

3. Types of configuration files

4. Sample code

springboot-config-load-order

V. Demonstration results

  • The meaning of priority
    For the same configuration item as the key, the configuration file with a higher priority will overwrite the configuration file with a lower priority.
    Configuration files with low priority. If you want the configuration item to work, you can only use different keys.

SpringBoot Version:>=2.4.2 (As of the post, the highest version 2.7.5)

Position priority: (reduced in turn)1> ./config/*/
2> ./config/
3> ./
4> Resources/config/
5>Resources/
 File type priority: (reduced in turn)1> .properties
2> .yml
3> .yaml
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

SpringBoot version: 2.4.1

Position priority: (reduced in turn)1> ./config/*/
2> ./config/
3> ./
4> Resources/config/
5>Resources/
 File type priority: (reduced in turn)1> .yaml
2> .yml
3> .properties
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

SpringBoot version: 2.4.0

Position priority: (reduced in turn)1> ./config/
2> ./config/*/
3> ./
4> Resources/config/
5>Resources/
 File type priority: (reduced in turn)1> .yaml
2> .yml
3> .properties
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

SpringBoot version: 2.3.[0,12].RELEASE

Position priority: (reduced in turn)1> ./config/
2> ./config/*/
3> ./
4> Resources/config/
5>Resources/
 File type priority: (reduced in turn)1> .properties
2> .yml
3> .yaml
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

SpringBoot version: 2.

Position priority: (reduced in turn)1> ./config/
2>No configuration files under ./config/*/ will be loaded3> ./
4> Resources/config/
5>Resources/
 File type priority: (reduced in turn)1> .properties
2> .yml
3> .yaml
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

The original version will be omitted and you will be interested in testing it yourself.

VI. Special circumstances

Specify priority configuration: =xxx, this configuration item follows the following rules:

  1. This configuration is also a configuration item, and the priority of its function follows the above rules
  2. The highest priority will overwrite the lower priority (note that it is not merge but overwrite)
  3. xxx can specify multiple configuration files, such as dev, alpha, and prod. The higher the next priority, the higher the priority, the higher the level.
  4. The specified configuration file xxx cannot be repeated again with =yyy
  5. Only configuration items with high priority will work