| JSP 构架-2种方式：Model I和Model II__教程 |
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| 日期：2007-5-20 1:18:54 人气：165 [大 中 小] |
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if (request.getParameterValues("zone") != null)
{
String timeZoneArg = request.getParameterValues("zone")[0];
timeZone = TimeZone.getTimeZone("GMT+" + timeZoneArg + ":00");
// gets a TimeZone. For this example we´re just going to assume
// its a positive argument, not a negative one.
}
TimeBean timeBean = new TimeBean();
timeBean.setHours = myCalendar.get(Calendar.HOUR_OF_DAY);
timeBean.setMinutes = myCalendar.get(Calendar.MINUTE);
timeBean.setSeconds = myCalendar.get(Calendar.SECOND);
request.setAttribute("tempTimeBean", timeBean);
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View: displayTime2.jsp
和displayTime.jsp非常相似，但timeByZone2.jsp在也的顶部被调用。请注意 中的"scope"已经被换成了"request"。
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Time JSP
:
:
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在一个在建系统中，我们已经使用这种方法来创建类的链，每一个都只对它所处理的工作负责。通过辨别公用的表示格式，我们创建了一个View对象，即使在很高层次的JSP中它也可以重复使用。我们的目标就是建立一些可重用的页，同时减少用于表示的类的数量。
单个的Servlet Model (A Model II Design)
什么时候我有足够时间来研究这个课题，我会在这里发表更多的东西。
附原文：
JSP Architectures
An explanation and comparison of the methodologies
commonly known as "Model I" and "Model II".
Lance Lavandowska To Outline
If you spend any time reading through Servlet or JSP related newsgroups or mailing lists, you´re likely to encounter a discussion of Model I versus Model II methodologies . Which one you use depends on personal taste, team work strategies and OOP orthodoxy.
Loosely described, Model I is an approach where business logic and presentation code can be intermixed with the presentation itself (HTML in our arena). Model II proscribes that all code, to the extent this is possible, be excluded from the presentation.
Model I: Simple 2 1/2 Tier Application
In a team environment where everyone knows Java and HTML, or if you´re doing it all yourself, this approach can work well, provided everyone maintains a clear coding structure (that discussion is outside the bounds of this article). The primary advantage of this approach is that there is only one file to maintain for changes to your application. The major disadvantage is readability! Unless great care is taken, your HTML and Java code can become so intermingled that it becomes difficult to debug and maintain your application.
For this example, we are going to revisit the "Sample Page" from the JSP Quick Start chapter. I´m going to add a TimeZone element, so we´ll have a JSP that returns the time based on the desired timezone. If no TimeZone is submitted, we´ll default to that of the server. |
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| 出处：本站原创 作者：佚名 |
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