Spring Cloud(02)——bootstrap文件介绍

elim168 2020-11-13 03:19:21
spring bootstrap 文件 介绍 Cloud


bootstrap文件介绍

bootstrap的中文翻译是“引导程序”的意思。Spring中的ApplicationContext是会有父子关系的。Spring Cloud初始化的ApplicationContext叫bootstrap ApplicationContext,之后会创建一些子的ApplicationContext。这个bootstrap ApplicationContext如果在初始化的过程中是可以接收一些外部属性控制的,那么对应的属性需要配置在bootstrap.yml或bootstrap.properties文件中。默认会在Classpath的根路径或config路径下寻找它们。ApplicationContext是有父子关系的,那依托于ApplicationContext的Environment也相当于间接的有了父子关系,所以定义在bootstrap.yml文件中的属性值也可以被我们自己定义的bean使用。只是它里面的值会被我们定义在application.yml中的相同属性的值覆盖掉。bootstrap ApplicationContext寻找的外部属性文件的名字不一定是bootstrap,它可以通过系统属性spring.cloud.bootstrap.name进行指定,比如通过系统属性spring.cloud.bootstrap.name指定bootstrap属性文件的名称是application,即会在Classpath根目录或config目录下寻找application.yml或application.properties文件。也可以通过系统属性spring.cloud.bootstrap.location指定bootstrap文件的位置,它们的用法就类似于Spring Boot中指定配置文件的spring.config.name和spring.config.location`。

如果在bootstrap.yml中指定了spring.profiles.active=dev,则bootstrap ApplicationContext寻找配置文件时还会寻找bootstrap-dev.yml文件。

如果有需要我们也需要在bootstrap ApplicationContext中做一些事情,比如定义一些bean等,则我们也可以定义一个使用@Configuration标注的Class,然后在Classpath下的META-INF/spring.factories文件中通过org.springframework.cloud.bootstrap.BootstrapConfiguration属性指定@Configuration类的名称。比如下面这样一个@Configuration类。

@Configuration
public class BootstrapConfiguration {

@Bean
public TestService testService() {

return new TestService();
}
}

那么在spring.factories文件中需要这样定义。

org.springframework.cloud.bootstrap.BootstrapConfiguration=com.elim.learn.spring.cloud.config.client.BootstrapConfiguration

(注:本文是基于Spring Cloud Finchley.SR1所写)

版权声明
本文为[elim168]所创,转载请带上原文链接,感谢
https://elim168.blog.csdn.net/article/details/93395072

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