1. Introduction
Profile is Spring's support for different configuration functions in different environments. You can quickly switch the environment by activating and specifying parameters
2. Configuration method
1. Multi-profile file format:
格式：application-{profile}.properties/yml
2.yml supports multiple document blocks
--- You can divide a yml file into multiple documents
3. Activate the specified profile
1. Specify spring.profiles.active = dev in the configuration file
2. Specified on the command line, will overwrite the configuration file configuration
Equivalent to executing in the command window
java -jar spring-boot-02-config-0.0.1-SNAPSHOT.jar --spring.profiles.active=dev
3. Virtual machine parameters
