1、Profile功能
为了方便多环境适配,springboot简化了profile功能。
1、application-profile功能
-
默认配置文件 application.yaml;任何时候都会加载
-
指定环境配置文件 application-{env}.yaml
-
激活指定环境
-
- 配置文件激活
- 命令行激活:java -jar xxx.jar –spring.profiles.active=prod --person.name=haha
-
-
- 修改配置文件的任意值,命令行优先
-
-
默认配置与环境配置同时生效
-
同名配置项,profile配置优先
2、@Profile条件装配功能
@Configuration(proxyBeanMethods = false)
@Profile("production")
public class ProductionConfiguration {
// ...
}
3、profile分组
spring.profiles.group.production[0]=proddb
spring.profiles.group.production[1]=prodmq
使用:--spring.profiles.active=production 激活
2、外部化配置
https://docs.spring.io/spring-boot/docs/current/reference/html/spring-boot-features.html#boot-features-external-config
- Default properties (specified by setting
SpringApplication.setDefaultProperties
). @PropertySource
annotations on your@Configuration
classes. Please note that such property sources are not added to theEnvironment
until the application context is being refreshed. This is too late to configure certain properties such aslogging.*
andspring.main.*
which are read before refresh begins.- Config data (such as
**application.properties**
files) - A
RandomValuePropertySource
that has properties only inrandom.*
. - OS environment variables.
- Java System properties (
System.getProperties()
). - JNDI attributes from
java:comp/env
. ServletContext
init parameters.ServletConfig
init parameters.- Properties from
SPRING_APPLICATION_JSON
(inline JSON embedded in an environment variable or system property). - Command line arguments.
properties
attribute on your tests. Available on@SpringBootTest
and the test annotations for testing a particular slice of your application.@TestPropertySource
annotations on your tests.- Devtools global settings properties in the
$HOME/.config/spring-boot
directory when devtools is active.
1、外部配置源
常用:Java属性文件、YAML文件、环境变量、命令行参数;
2、配置文件查找位置
(1) classpath 根路径
(2) classpath 根路径下config目录
(3) jar包当前目录
(4) jar包当前目录的config目录
(5) /config子目录的直接子目录
3、配置文件加载顺序:
- 当前jar包内部的application.properties和application.yml
- 当前jar包内部的application-{profile}.properties 和 application-{profile}.yml
- 引用的外部jar包的application.properties和application.yml
- 引用的外部jar包的application-{profile}.properties 和 application-{profile}.yml
4、指定环境优先,外部优先,后面的可以覆盖前面的同名配置项
3、自定义starter
1、starter启动原理
- starter-pom引入 autoconfigurer 包
-
autoconfigure包中配置使用 META-INF/spring.factories 中 EnableAutoConfiguration 的值,使得项目启动加载指定的自动配置类
-
编写自动配置类 xxxAutoConfiguration -> xxxxProperties
-
- @Configuration
- @Conditional
- @EnableConfigurationProperties
- @Bean
- …
引入starter — xxxAutoConfiguration — 容器中放入组件 ---- 绑定xxxProperties ---- 配置项
2、自定义starter
atguigu-hello-spring-boot-starter(启动器)
atguigu-hello-spring-boot-starter-autoconfigure(自动配置包)