Connection con=DriverManager.getConnection("jdbc:oracle:thin:@211.168.168.104:1521:ORCL","system","manager");
改成
String dbuser = ....;//你的数据库用户名,向给你建库的人要
String dbpassword = .....;//你的数据库密码,
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@211.168.168.104:1521:ORCL", dbuser, dbpassword);