springboot中application.properties 改成 application.yml详解

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springboot官方推荐使用application.yml配置文件，yml文件的好处，天然的树状结构，一目了然。使用的时候需要注意一些细节的地方：

原有的key，例如spring.jpa.properties.hibernate.dialect，按“.”分割，都变成树状的配置，key后面的冒号，后面一定要跟一个空格。

下面对比两个文件

application.properties:

server.port=8080
server.session-timeout=30
server.context-path=
server.tomcat.max-threads=0
server.tomcat.uri-encoding=UTF-8

spring.datasource.url = jdbc:mysql://localhost:3306/spring
spring.datasource.username = root
spring.datasource.password = root
spring.datasource.driverClassName = com.mysql.jdbc.Driver
# Specify the DBMS
spring.jpa.database = MYSQL
# Show or not log for each sql query
spring.jpa.show-sql = true
# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = update
# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy

# stripped before adding them to the entity manager)
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

application.yml:

server:
  port: 8080
  session-timeout: 30
  tomcat.max-threads: 0
  tomcat.uri-encoding: UTF-8

spring:
  datasource:
    url : jdbc:mysql://localhost:3306/springboot
    username : root
    password : root
    driverClassName : com.mysql.jdbc.Driver
  jpa:
    database : MYSQL
    show-sql : true
    hibernate:
      ddl-auto : update
      naming-strategy : org.hibernate.cfg.ImprovedNamingStrategy
    properties:
      hibernate:
        dialect : org.hibernate.dialect.MySQL5Dialect

The end!

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