何时使用JSP的<jsp:include>标签与<%@include>指令？

Hey fellow developer, let's break down the two common ways to include JSP files into another one—<jsp:include> tag and <%@include> directive. I’ve used both across various projects, so here’s a straightforward walkthrough:

代码示例 #

First, here’s how you’d implement each in your JSP:

<!-- 使用jsp:include标签引入目标JSP -->
<jsp:include page="sample.jsp" flush="false" />

<!-- 使用<%@include指令引入目标JSP -->
<%@include file="./inc/jsp3.jsp" %>

核心差异 #

The biggest distinction comes down to when the inclusion process runs:

• <jsp:include> kicks in at the request processing stage. Every time a client sends a request, it loads and executes the target JSP, then injects its output into the current page. It’s a fully dynamic inclusion.
• <%@include> operates during the JSP-to-Servlet translation stage. It essentially merges the code of the target file directly into the current JSP before compilation, resulting in a single Servlet class for both files.

Practical Project Usage #

In real-world development, <jsp:include> is the preferred choice for dynamic web scenarios. For example, if you need to load different content based on request parameters, or if the included content updates frequently—its dynamic flexibility fits perfectly here.

Meanwhile, <%@include> shines for static, unchanging common snippets like page headers, footers, or fixed navigation bars. Since it’s merged during translation, it delivers better performance for these consistent elements.

内容的提问来源于stack exchange，提问作者Dil.