Spring cloud (02) -- Introduction to bootstrap file

elim168 2020-11-13 03:19:21
spring cloud introduction bootstrap file

bootstrap The file is introduced

bootstrap The Chinese translation of is “ Bootstrap ” It means .Spring Medium ApplicationContext There will be a father son relationship .Spring Cloud The initialization of the ApplicationContext It's called bootstrap ApplicationContext, After that, we will create some sub ApplicationContext. This bootstrap ApplicationContext If you can receive some external property control during initialization , Then the corresponding properties need to be configured in bootstrap.yml or bootstrap.properties In file . The default will be Classpath The root path of or config Find them in the path .ApplicationContext It's a father son relationship , That depends on ApplicationContext Of Environment Also equivalent to the indirect relationship between father and son , So it's defined in bootstrap.yml The attribute values in the file can also be defined by us bean Use . It's just that the values in it will be defined by us in application.yml The value of the same attribute in the .bootstrap ApplicationContext The name of the external properties file you are looking for is not necessarily bootstrap, It can be done through system properties spring.cloud.bootstrap.name Make a designation , For example, through system properties spring.cloud.bootstrap.name Appoint bootstrap The name of the properties file is application, That will be Classpath Root directory or config Look for application.yml or application.properties file . You can also use system properties spring.cloud.bootstrap.location Appoint bootstrap The location of the file , Their usage is similar to Spring Boot Of the configuration file specified in spring.config.name and spring.config.location`.

If in bootstrap.yml Specified in spring.profiles.active=dev, be bootstrap ApplicationContext When you look for a configuration file, you also look for bootstrap-dev.yml file .

If it's necessary, we also need to be in bootstrap ApplicationContext Do something , For example, define some bean etc. , Then we can also define the use of @Configuration Dimensioned Class, And then in Classpath Under the META-INF/spring.factories Through the file org.springframework.cloud.bootstrap.BootstrapConfiguration Attribute specifies @Configuration The name of the class . Like the one below @Configuration class .

public class BootstrapConfiguration {

public TestService testService() {

return new TestService();

So in spring.factories It needs to be defined in the document .


( notes : This paper is based on Spring Cloud Finchley.SR1 written )


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