Question

我有一个通过我的jdbc的对象类，我希望在客户登录时显示所有订单。

我的数据库中有一个类可以访问所有订单：

public static ArrayList<OrderSample> showOrders() throws ClassNotFoundException, SQLException, LoginSampleException {
    try {
        ArrayList<OrderSample> order = new ArrayList();

        Connection con = Connector.connection();
        String SQL = "SELECT * from useradmin.users";
        Statement statement = con.createStatement();
        ResultSet rs = statement.executeQuery(SQL);
        while(rs.next()){

        int id = rs.getInt("idorder");
        int height = rs.getInt("height");
        int length = rs.getInt("length");
        int width = rs.getInt("width");

        OrderSample o = new OrderSample(height, length, width);
        order.add(o);
        }
        return order;
  } catch (ClassNotFoundException | SQLException ex) {
        throw new LoginSampleException(ex.getMessage());
    }
}
}

然后我有一个servlet方法将信息放到会话对象中，从命令超类来处理所有请求：

public class Employee extends Command {

@Override
String execute(HttpServletRequest request, HttpServletResponse response) throws LoginSampleException {
    try {
        ArrayList<OrderSample> orders =UserMapper.showOrders();
        request.setAttribute("orders", orders);

    } catch (ClassNotFoundException ex) {
        Logger.getLogger(Employee.class.getName()).log(Level.SEVERE, null, ex);
    } catch (SQLException ex) {
        Logger.getLogger(Employee.class.getName()).log(Level.SEVERE, null, ex);
    }

    return "employee";
}

当我尝试循环通过订单对象以在我的jsp中显示它们时，它们不会显示

 <c: forEach items="${order}" var="order">
     <tr>
         <td>Order to delete </td>

    </tr>
</c:forEach>

Answer 1

您正在HttpServletRequest中设置回复对象。您必须适当地设置响应内容类型，然后在响应正文中设置内容。

不在jsp中显示对象值

1 个答案: