jdbc連接oracle及簡單分頁

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();             // 分頁             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));             }             // 計算             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");     } }