1.Java mailsender Test하기
https://stackoverflow.com/questions/16854993/how-do-i-test-the-javamailsender-of-spring
2.로그분석 시작하기 예제
https://taetaetae.github.io/2019/02/10/access-log-to-elastic-stack/
https://kim-solshar.tistory.com/64
3. Redis 테스트를 위한 예제
https://jojoldu.tistory.com/297
https://derveljunit.tistory.com/310
