SpringBoot case-configuration file-yml configuration file

configuration format

• SpringBoot provides a variety of property configuration methods
  • application.properties
  • application.yml
  • application.yaml
• Comparison of Common Configuration File Formats
  • XML (bloated)

    • <configuration>
        <database>
          <host>localhost</host>
          <port>3306</port>
          <username>admin</username>
          <password>password123</password>
        </database>
      </configuration>
      

  • properties (hierarchical structure is not clear enough)

    • database.host=localhost
      database.port=3306
      database.username=admin
      database.password=password123
      

  • yml/yaml ( concise, data-centric, recommended )

    • database:
        host: localhost
        port: 3306
        username: admin
        password: password123
      

yml

basic grammar

• Case Sensitive
• There must be a space before the value , as a separator
• Use indentation to represent hierarchical relationships. When indenting, tab keys are not allowed, only spaces can be used (idea will automatically convert tabs to spaces)
• The number of spaces indented is not important, as long as the elements of the same level are left-aligned
• # Indicates a comment, from this character to the end of the line, it will be ignored by the parser

yml data format

• Object/Map collection

  • user
        name：zhangsan
        age：20
        password：123

• Array/List/Set collection

  • hooby：
        - java
        - game
        - sport

yml configuration

• Replace the original properties configuration file
•