Spring Bootで外部properties読み込み

ファイルの階層

ソース

some.properties

test01=HOGE
TEST02=22

application.properties

name="takeshi"

ReadProperties.java

package com.example.demo;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

import lombok.Data;

// lombookの機能、ゲッターセッターtostring等をいい感じに作っといてくれる
@Data
@Component
@PropertySource("classpath:some.properties")
public class ReadProperties.java {

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

	@Value("${test01}")
	private String TEST01;

	@Value("${TEST02}")
	private String TEST02;

}

SpringBootDemoApplication.java

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;

@SpringBootApplication
public class SpringBootDemoApplication {

	public static void main(String[] args) {
		ConfigurableApplicationContext context = SpringApplication.run(SpringBootDemoApplication.class, args);
		ReadProperties bean = context.getBean(ReadProperties.class);
		System.out.println(bean.toString());
		context.close();
	}

}

実行結果

ReadProperties(name="takeshi", TEST01=HOGE, TEST02=22)

Environmentを使って取得するパターン

ReadProperties.java

package com.example.demo;

import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

import lombok.Data;

// lombookの機能、ゲッターセッターtostring等をいい感じに作っといてくれる
@Data
@Component
@PropertySource("classpath:some.properties")
public class ReadProperties {

	private final Environment env;
	
//	@Value("${name}")
	private String name;

//	@Value("${test01}")
	private String TEST01;

//	@Value("${TEST02}")
	private String TEST02;

	public void showProperties() {
		System.out.println(env.getProperty("name"));
		System.out.println(env.getProperty("test01"));
		System.out.println(env.getProperty("TEST02.a"));
	}
	
}

some.properties

test01=HOGE
TEST02.a=22

実行結果

"takeshi"
HOGE
22