환경변수 사용하기
참조사이트 : https://docs.spring.io/spring/docs/3.0.x/spring-framework-reference/html/expressions.html: https://stackoverflow.com/questions/6285978/is-there-any-syntax-like-systempropertiesenvironment-variable-name-to-g 6.4 Expression support for defining bean definitionsSpEL expressions can be used with XML or annotation based configuration metadata for defining BeanDefinitions. In both cases the sy..