转换为 JSTL(特别是调用方法)

发布于 2024-10-09 02:30:05 字数 1986 浏览 6 评论 0原文

我正在采用完整的 JSTL 方式,并且我遇到了以下 scriplet 的问题,我已经将变量显示和条件转换为表达式语言(EL),但我不太确定如何通过方法调用来做到这一点:这是我的 JSP 代码,它位于 html 标记之前: <代码> UserDTO user = (UserDTO) session.getAttribute("用户");

        OrderDAO lnkOrder = new OrderDAO();
        OrderDTO order = new OrderDTO();

        CoverDAO lnkCover = new CoverDAO();
        CoverDTO cover = new CoverDTO();

        UpgradesDAO lnkUpgrades = new UpgradesDAO();
        UpgradesDTO upgrades = new UpgradesDTO();

        OrderAccessorieDAO lnkOrderAcc = new OrderAccessorieDAO();
        List<OrderAccessorieDTO> orderAccessories = new ArrayList<OrderAccessorieDTO>();

        GroupColorsDAO lnkColors = new GroupColorsDAO();
        List<ColorDTO> ColorList = new ArrayList<ColorDTO>();
        ColorList = lnkColors.getGroupColors(user.getGroup());

        AccessoryDAO lnkAcc = new AccessoryDAO();
        List<AccessoryDTO> groupAccessories = new ArrayList<AccessoryDTO>();
        groupAccessories = lnkAcc.getGroupAccessories(user.getGroup());

        ChangesDAO lnkChanges = new ChangesDAO();
        List<ChangeDTO> orderChanges = new ArrayList<ChangeDTO>();

        String CurrentOrder = request.getParameter("CurrentOrder");

        if (lnkOrder.exists(CurrentOrder)) {
            order = lnkOrder.find(CurrentOrder);
            cover = lnkCover.find(order.getReferenceNumber());
            upgrades = lnkUpgrades.find(order.getReferenceNumber());
            orderAccessories = lnkOrderAcc.getOrderAccessories(order.getReferenceNumber());
            orderChanges = lnkChanges.getOrderChanges(order.getReferenceNumber());
        }

正如您所看到的,它几乎是 DAO 和 DTO 对象,我知道它可以使用静态方法并制作自定义标记库来完成,但这意味着为每个方法调用编写代码,还有其他方法吗?接受建议。 VIEW(HTML 标记)的简要描述,它显示给定订单的详细信息,订单名称是从 get 请求中提取的。

另外我还有另一个小问题,假设我将所有内容移植到 JSTL,我是否必须导入相应的 myDTO 和 myDAO 包才能访问每个 DTO 的 getter 和 setter?

问候特里斯蒂安。

I'm in the process of going the full JSTL way, and I've got an issue with the following scriplet, I have already transformed the variable displaying and conditions to the expression language (EL) but I'm not so sure of how to do it with method calling : here's my JSP code its positioned before the html markup:

UserDTO user = (UserDTO) session.getAttribute("user");

        OrderDAO lnkOrder = new OrderDAO();
        OrderDTO order = new OrderDTO();

        CoverDAO lnkCover = new CoverDAO();
        CoverDTO cover = new CoverDTO();

        UpgradesDAO lnkUpgrades = new UpgradesDAO();
        UpgradesDTO upgrades = new UpgradesDTO();

        OrderAccessorieDAO lnkOrderAcc = new OrderAccessorieDAO();
        List<OrderAccessorieDTO> orderAccessories = new ArrayList<OrderAccessorieDTO>();

        GroupColorsDAO lnkColors = new GroupColorsDAO();
        List<ColorDTO> ColorList = new ArrayList<ColorDTO>();
        ColorList = lnkColors.getGroupColors(user.getGroup());

        AccessoryDAO lnkAcc = new AccessoryDAO();
        List<AccessoryDTO> groupAccessories = new ArrayList<AccessoryDTO>();
        groupAccessories = lnkAcc.getGroupAccessories(user.getGroup());

        ChangesDAO lnkChanges = new ChangesDAO();
        List<ChangeDTO> orderChanges = new ArrayList<ChangeDTO>();

        String CurrentOrder = request.getParameter("CurrentOrder");

        if (lnkOrder.exists(CurrentOrder)) {
            order = lnkOrder.find(CurrentOrder);
            cover = lnkCover.find(order.getReferenceNumber());
            upgrades = lnkUpgrades.find(order.getReferenceNumber());
            orderAccessories = lnkOrderAcc.getOrderAccessories(order.getReferenceNumber());
            orderChanges = lnkChanges.getOrderChanges(order.getReferenceNumber());
        }


As yo can see it's pretty much DAO and DTO objects, I know that it can be done using static methods and making custom taglibs but that would mean writing a code for each method call, any other approach?, suggestions accepted. A brief description of the VIEW(HTML markup) it displays the details of a given order, the order name is extracted from a get request.

Also I have another small question, suppose I port everything to JSTL, would I have to import the corresponding myDTO and myDAO packages to access its getters and setters for each DTO?

Regards Tristian.

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评论(2

半边脸i 2024-10-16 02:30:05

如果视图和逻辑之间没有完全分离,“JSTL 方式”就没有意义,如 模型 2 方法

在模型 2 方法中,您将此代码移至充当 JSTL 页面控制器的 servlet,并且仅使用 JSP 进行视图标记。否则,使用 JSTL 来强制逻辑和视图之间的分离是没有意义的。

"JSTL way" doesn't make sense without full separation between view and logic, as in Model 2 approach.

In Model 2 approach you move this code to the servlet that acts as a controller for your JSTL page, and only use JSP for view markup. Otherwise using JSTL to enforce separation between logic and view with JSTL would be meaningless.

音栖息无 2024-10-16 02:30:05

我知道的唯一解决办法(肮脏的)是将这些方法公开为假地图,即有一个具有像“Object getSomething(Object o)”这样的签名的方法。通过这种方式,您可以传递一个参数,并且它可以绕过强加的规则。丑陋但它有效。

不过同意 axtavt

The only work around (dirty) that I know is to expose the methods as a fake map, that is have a method that has a sig like "Object getSomething(Object o)". In this way you can pass an argument, and it gets around the imposed rules. Fugly but it works.

Agree with axtavt though

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