spring boot中application.yml是按什么顺序读取的？

Question

I suppose that it reads in work working circuit and then it reads in testing circuit .

If application.yml is in testing circuit , it settings replace the settings has been reading in application.yml of working circuit. If You have defined application-test.yml and you point above a class an annotation @SpringBootTest and above @ActiveProfile("test") then the settings from application-test.yml replaces earlier settings.

what do you think about all this ? How to understand this process correctly?

Answer 1

• Terminology:

Work Circuit : /src/main/resources

Test Circuit : /src/test/resources

• Work Circut

application.yaml

main:
  car:
    name: "Audi"
    id: "10201"

application-local.yaml

main:
  car:
    name: "Mercedes"
    id: "10200"

• main class

@SpringBootApplication
public class SpringProfilesApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringProfilesApplication.class, args);
    }

    @Bean
    CommandLineRunner commandLineRunner(ProfileMain profileMain) {
        return args -> {
            profileMain.printMainName();

        };
    }
}

• class

@Component
public class ProfileMain {

    @Value("${main.car.name}")
    private String name;

    @Value("${main.car.id}")
    private String id;

    public void printMainName() {
        System.out.println("\n name in Main application.yaml : " + this.name + "\n");
        System.out.println("\n name in Main application.yaml : " + this.id + "\n");
    }
}

– When you run the main class, without specifying any profiles, application.yaml will be used. – You can specify the profile you need in the development environment

Now the settings of those properties that were in the main application.yaml , will be overridden in the specified profile - local . If the selected profile does not contain the settings that are in the main application.yaml , then the missing properties will be taken from the main application.yaml .

Answer 2

According to Spring Boot reference documentation , the configuration data files are considered in the following order:

1. Application properties packaged inside your jar (application.properties and YAML variants).
2. Profile-specific application properties packaged inside your jar (application-{profile}.properties and YAML variants).
3. Application properties outside of your packaged jar (application.properties and YAML variants).
4. Profile-specific application properties outside of your packaged jar (application-{profile}.properties and YAML variants).

Answer 3

you have to put this in your application-test.yml

spring:
  profiles: test