jdbc连接oracle及简单分页

public class OracleFenye extends Action {
    private int pageNow = 1;
    private int totalPage = 0;
    private int pageSize = 3;
    @SuppressWarnings("unchecked")
    @Override
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response) throws Exception {
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            Connection conn = DriverManager.getConnection(
                    "jdbc:oracle:thin:@localhost:1521:orcldb", "scott", "tiger");
            Statement st = conn.createStatement();
            // 分页
            String pageNo = request.getParameter("pageNow");
            if (pageNo != null) {
                pageNow = Integer.parseInt(request.getParameter("pageNow"));
            }
            ResultSet rs = st
                    .executeQuery("select * from (select a1.*,rownum rn from (select * from emp) a1 where rownum <="
                            + pageSize
                            * pageNow
                            + ") where rn >="
                            + ((pageNow - 1) * pageSize + 1)
                            + " ");
            List list = new ArrayList();
            while (rs.next()) {
                list.add(rs.getString(2));
            }
            // 计算
            totalPage rs = st.executeQuery("select count(*) from emp");
            List pageList = new ArrayList();
            while (rs.next()) {
                int rsno = rs.getInt(1);
                if (rsno % 2 == 0) {
                    totalPage = rsno / pageSize + 1;
                } else {
                    totalPage = rsno / pageSize;
                }
            }
            for (int i = 1; i <= totalPage; i++) {
                pageList.add(i);
            }
            request.setAttribute("rsList", list);
            request.setAttribute("pageList", pageList);
            rs.close();
            st.close();
            conn.close();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return mapping.findForward("fenye");
    }
}