https://www.youtube.com/watch?v=RYo3OGlRoJw&list=PLRx0vPvlEmdAZv_okJzox5wj2gG_fNh_6&index=4 1. UserDAO.java 생성/설정 (mysql 데이터베이스하고 직접적인 연결 담당) package user; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; public class UserDAO { private Connection conn; private PreparedStatement pstmt; //해킹을 방지하는 private ResultSet rs; public ..