Spring Boot アプリケーション

import java.io.IOException;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.boot.env.YamlPropertySourceLoader;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.PropertySource;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.util.Assert;

public class MyEnvironmentPostProcessor implements EnvironmentPostProcessor {

	private final YamlPropertySourceLoader loader = new YamlPropertySourceLoader();

	@Override
	public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
		Resource path = new ClassPathResource("com/example/myapp/config.yml");
		PropertySource<?> propertySource = loadYaml(path);
		environment.getPropertySources().addLast(propertySource);
	}

	private PropertySource<?> loadYaml(Resource path) {
		Assert.isTrue(path.exists(), () -> "Resource " + path + " does not exist");
		try {
			return this.loader.load("custom-resource", path).get(0);
		}
		catch (IOException ex) {
			throw new IllegalStateException("Failed to load yaml configuration from " + path, ex);
		}
	}

}

import org.springframework.boot.SpringApplication
import org.springframework.boot.env.EnvironmentPostProcessor
import org.springframework.boot.env.YamlPropertySourceLoader
import org.springframework.core.env.ConfigurableEnvironment
import org.springframework.core.env.PropertySource
import org.springframework.core.io.ClassPathResource
import org.springframework.core.io.Resource
import org.springframework.util.Assert
import java.io.IOException

class MyEnvironmentPostProcessor : EnvironmentPostProcessor {

	private val loader = YamlPropertySourceLoader()

	override fun postProcessEnvironment(environment: ConfigurableEnvironment, application: SpringApplication) {
		val path: Resource = ClassPathResource("com/example/myapp/config.yml")
		val propertySource = loadYaml(path)
		environment.propertySources.addLast(propertySource)
	}

	private fun loadYaml(path: Resource): PropertySource<*> {
		Assert.isTrue(path.exists()) { "Resource $path does not exist" }
		return try {
			loader.load("custom-resource", path)[0]
		} catch (ex: IOException) {
			throw IllegalStateException("Failed to load yaml configuration from $path", ex)
		}
	}

}