현재 실행중인 운영체제의 환경변수 값 살펴보기

1️⃣ 일반 자바 클래스 이용

Properties props = System.getProperties();
		Set<String> keys = props.stringPropertyNames();
		for (String key : keys) {
			System.out.println(key + "\\t" + props.getProperty(key));
		}
		System.out.println("#################################################");

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2️⃣ 스프링 이용

GenericXmlApplicationContext ctx = new GenericXmlApplicationContext();
		
		ConfigurableEnvironment env = ctx.getEnvironment();
		
		Map<String, Object> m = env.getSystemProperties();
		Set<String> keys2 = m.keySet();
		for (String key : keys2) {
			System.out.println(key + "\\t" + m.get(key));
		}

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