包含另一个 JSP 文件 [英] Include another JSP file

问题描述

我目前正在尝试学习 JSP.我的问题是，目前我曾经使用以下方法包含页面的页眉和页脚:

I am currently trying to learn JSP. My question is, at present I used to include the header and footer of the page using:

<%@include file="includes/header.jsp" %>

和

<%@include file="includes/footer.jsp" %>

但是现在，我也分离了页面内容.因此，如果用户点击一个页面，比如产品，它必须加载位于以下位置的 JSP 文件:includes/pages/products.jsp因此，指向用户的链接类似于:<a href="index.jsp?p=products">Products</a>.

But now, I have separated the page content also. So, if user clicks on a page, say products, it has to load the JSP file which is situated in: includes/pages/products.jsp So, the link to the user is like: <a href="index.jsp?p=products">Products</a>.

因此，我必须获取 p 值并根据它显示页面.

So, I have to get the p value and display the page based on it.

以下是我目前所做的.

<%
 if(request.getParameter("p")!=null)
 { 
   String p = request.getParameter("p");
%>    

<%@include file="includes/page_name.jsp" %>

<% 
 }
%>

那么，如何将变量p"的值放在page_name"的位置?

So, how do I place the value of variable "p" in position of "page_name" ?

或者，我可以使用其他任何方法吗?

Or, is there any other method that I could use ?

在 PHP 中，我们可以使用 include() 或 include_once().我有点卡在这个 JSP 中.:(

In PHP, we could use the include() or include_once(). I am bit stuck in this JSP. :(

推荐答案

您所做的是静态包含.静态包含在编译时解析，因此可能不使用仅在执行时已知的参数值.

What you're doing is a static include. A static include is resolved at compile time, and may thus not use a parameter value, which is only known at execution time.

您需要的是动态包含:

<jsp:include page="..." />

请注意，您应该使用 JSP EL 而不是 scriptlet.您似乎还使用 index.jsp 实现了一个中央控制器.您应该改用 servlet 来执行此操作，并从该 servlet 分派到适当的 JSP.或者更好的是，使用现有的 MVC 框架，如 Stripes 或 Spring MVC.

Note that you should use the JSP EL rather than scriptlets. It also seems that you're implementing a central controller with index.jsp. You should use a servlet to do that instead, and dispatch to the appropriate JSP from this servlet. Or better, use an existing MVC framework like Stripes or Spring MVC.

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