application.ymlfile: upload-dir: /path/uploadsController@Value("${file.upload-dir}")private String uploadDir;

@Value 사용: 변수Class 생성시, 값이 null임# application.ymlmail: host: smtp.co.kr# 정의@Componentpublic class EmailSender { @Value("${mail.host}") private String host; public EmailSender() { props = System.getProperties(); # Sprng boot 기동시, null 출력 log.debug(this.host); } public void test() { log.debug("host: " + host); }}# 호출 @RequestMapping("/test") public @ResponseBody String deGetHelloWorld(..