spring 的属性获取,取值.注解下的类和配置分离.

简单的用@value 复杂的用

@ConfigurationProperties("foo")

https://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#boot-features-external-config-typesafe-configuration-properties https://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#boot-features-external-config-vs-value
注解下:

类和配置分离.

24.7.1 Third-party configuration

As well as using

@ConfigurationProperties

to annotate a class, you can also use iton public

@Bean

methods. This can be particularly useful when you want to bindproperties to third-party components that are outside of your control.

To configure a bean from the

Environment

properties, add

@ConfigurationProperties

toits bean registration:

@ConfigurationProperties(prefix = "bar")
@Bean
public BarComponent barComponent() {
...
}

Any property defined with the

bar

prefix will be mapped onto that

BarComponent

beanin a similar manner as the

FooProperties

example above.