Use the spring profile mechanism to switch between dynamically injected beans.
For the time being, create a suitable spring-boot project.
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>hoge</groupId>
<artifactId>springbootexpr2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springbootexpr2</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.7.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
</project>
Create an appropriate interface and create some implementation classes for it.
public interface ProfileSample {
String getValue();
}
@Component
@Profile("default")
public class DefaultProfile implements ProfileSample {
public String getValue() {
return "default";
}
}
The default value for profile is `` `default```. Therefore, if you specify that value in profile annotation, this class will be used when profile is not specified.
@Component
@Profile("dev")
public class DevProfile implements ProfileSample {
public String getValue() {
return "dev";
}
}
@Component
@Profile("production")
public class ProductionProfile implements ProfileSample {
public String getValue() {
return "production";
}
}
Inject the interface created above into the startup class.
@Controller
@EnableAutoConfiguration
@ComponentScan
public class SampleController {
@Autowired
ProfileSample sample;
@RequestMapping("/")
@ResponseBody
String home() {
System.out.println(sample.getValue());
return "Hello World!";
}
public static void main(String[] args) throws Exception {
SpringApplication.run(SampleController.class, args);
}
}
After that, if you specify the spring.profiles.active property somewhere, that profile will be used, and if it is not specified, `` `default``` will be used as mentioned above.
The profile specification looks like this with command line arguments.
--spring.profiles.active=dev
When specifying in a property file, for example application.yaml, it looks like this.
application.yaml
spring.profiles.active: production
By the way, there are many ways to specify properties, so for the list and priority, see https://docs.spring.io/spring-boot/docs/2.0.0.M4/reference/htmlsingle/#boot-features-external-config
For the contents of this example, the default method of interface may be sufficient.
Recommended Posts