형이 해준대로 ? 앞뒤로 '?' 이렇게 해줬어 그리고 파라미터로 내가 입력한 문자열 dwk 넘기니까 이렇게 나왓어. 

java.sql.SQLException: 부적합한 열 인덱스
        at oracle.jdbc.driver.OraclePreparedStatement.setStringInternal(OraclePreparedStatement.java:5168)
        at oracle.jdbc.driver.OraclePreparedStatement.setString(OraclePreparedStatement.java:5156)
        at oracle.jdbc.driver.OraclePreparedStatementWrapper.setString(OraclePreparedStatementWrapper.java:278)
        at exUser.getInfoFromTable(exUser.java:60)
        at exUser.doGet(exUser.java:21)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
        at jeus.servlet.engine.ServletWrapper.executeServlet(ServletWrapper.java:313)
        at jeus.servlet.servlets.WorkerServlet.execute(WorkerServlet.java:277)
        at jeus.servlet.engine.WebtobRequestProcessor.run(WebtobRequestProcessor.java:183)