如何讀取MS訪問JPS

-1
我已經創建了這個用作貨幣轉換的servlet。它轉換三種貨幣（SAR，USD，Euro）。我有三個字段從。如何能我這個servlet轉換成JSP的轉換值讀取訪問表？..如何讀取MS訪問JPS
public class cur_exchange extends HttpServlet { 
    String from = ""; 
    String to = ""; 
    double amount = 0.0; 
    String message = ""; 
    double total = 0.0; 
    @Override 
    public void init() { 
    try { 
     Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 
     System.out.println("JDBC driver loaded"); 
    } 
    catch (ClassNotFoundException e) { 
     System.out.println(e.toString()); 
    } 
    } 
    @Override 
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 

     display_form(false, request, response, false); 
    } 
    @Override 
    public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { 

     from = request.getParameter("from"); 
     to = request.getParameter("to"); 
     boolean error = false; 
     try 
     { 
      amount = Double.parseDouble(request.getParameter("amount").toString()); 
     } 
     catch (Exception e) { 
       message = "Error: Please Type Valid Number To Convert"; 
       error = true; 
      } 
     if(from.equals(to)) 
     { 
      total = amount; 
      display_form(true, request, response, false); 
     } 
     else 
     { 
      try { 
        Connection con = DriverManager.getConnection("jdbc:odbc:MS Access Database"); 
        System.out.println("got connection"); 
        Statement s = con.createStatement(); 
        String sql = "SELECT RATE FROM EXCHANGE_RATE WHERE FROM_CUR='"+from+"' AND TO_CUR='"+to+"'"; 
        ResultSet rs = s.executeQuery(sql); 
        if (rs.next()) { 
         total = amount * Double.parseDouble(rs.getString(1)); 
        } 
        else 
        { 
         s = con.createStatement(); 
         sql = "SELECT RATE FROM EXCHANGE_RATE WHERE FROM_CUR='"+to+"' AND TO_CUR='"+from+"'"; 
         rs = s.executeQuery(sql); 
         if (rs.next()) 
         { 
          total = amount/Double.parseDouble(rs.getString(1)); 
         } 
        } 
      } 
      catch (SQLException e) { 
       message = "Error." + e.toString(); 
       error = true; 
      } 
      catch (Exception e) { 
       message = "Error." + e.toString(); 
       error = true; 
      } 
     rs.close(); 
     s.close(); 
      con.close(); 

      if (error) 
       display_form(true , request, response, true); 
      else 
       display_form(true, request, response, false); 
     } 
    } 

    public void display_form(boolean populated, HttpServletRequest request, HttpServletResponse response, boolean error) throws ServletException, IOException { 

     PrintWriter out = response.getWriter(); 
     out.println("<html>"); 
     out.println("<head>"); 
     out.println("</head>"); 
     out.println("<body>"); 
     out.println("<CENTER>"); 
     if (error) 
      out.println("<h3 style='color:red'>"+message+"</h3><br /><br />"); 
     out.println("<h1 style='text-decoration:underline'>Currency Converter</h1>"); 
     out.println("<form action='cur_exchange.java' method='post'>"); 
     out.println("<br /><br /><label>From:"); 
     out.println("<select name='from'>"); 
     if (populated) 
     { 
      if (from.equals("SAR")) 
      { 
       out.println("<option selected='selected'>SAR</option>"); 
      } 
      else 
      { 
       out.println("<option>SAR</option>"); 
      } 
      if (from.equals("$")) 
      { 
       out.println("<option selected='selected'>$</option>"); 
      } 
      else 
      { 
       out.println("<option>$</option>"); 
      } 
      if (from.equals("EURO")) 
      { 
       out.println("<option selected='selected'>EURO</option>"); 
      } 
      else 
      { 
       out.println("<option>EURO</option>"); 
      } 
     } 
     else 
     { 
      out.println("<option>SAR</option>"); 
      out.println("<option>$</option>"); 
      out.println("<option>EURO</option>"); 
     } 
     out.println("</select></label>"); 
     out.println("<br /><br /><label>To:"); 
     out.println("<select name='to'>"); 
     if (populated) 
     { 
      if (to.equals("SAR")) 
      { 
       out.println("<option selected='selected'>SAR</option>"); 
      } 
      else 
      { 
       out.println("<option>SAR</option>"); 
      } 
      if (to.equals("$")) 
      { 
       out.println("<option selected='selected'>$</option>"); 
      } 
      else 
      { 
       out.println("<option>$</option>"); 
      } 
      if (to.equals("EURO")) 
      { 
       out.println("<option selected='selected'>EURO</option>"); 
      } 
      else 
      { 
       out.println("<option>EURO</option>"); 
      } 
     } 
     else 
     { 
      out.println("<option>SAR</option>"); 
      out.println("<option>$</option>"); 
      out.println("<option>EURO</option>"); 
     } 
     out.println("</select></label><br />"); 
     if(populated) 
     { 
      out.println("<br /><label>Amount: <input name='amount' type='text' size='25' maxlength='30' id='amount' value='"+amount+"' /></label><br />"); 
     } 
     else 
     { 
      out.println("<br /><label>Amount: <input name='amount' type='text' size='25' maxlength='30' id='amount' /></label><br />"); 
     } 
     if(populated) 
     { 
      out.println("<br /><label>Result: <input name='result' type='text' size='25' maxlength='30' id='result' disabled='disabled' value='"+total+"'/></label><br />"); 
     } 
     else 
     { 
      out.println("<br /><label>Result: <input name='result' type='text' size='25' maxlength='30' id='result' disabled='disabled' /></label><br />"); 
     } 
     out.println("<br /><input type='submit' value='Convert'/>"); 
     out.println("</form>"); 
     out.println("</CENTER>"); 
     out.println("</body>"); 
     out.println("</html>"); 
    } 
}
來源
2012-04-27 AliDeV
閱讀這些tutorials
改寫爲JSP文件之一。
來源
2012-04-27 22:03:50
「讓我爲你谷歌」:) – 2012-04-27 22:32:41
如何讀取MS訪問JPS

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