jsp include两种调用形式详细

include有两种形式,分别是Include指令：<%@ include file=""%>和include动作：<jsp教程:include page="" flush="true"/>

include调用文件

<%@ include file=""%>，是将被引入的JSP与原JSP融合到一起，而这个融合过程是在翻译阶段进行的

index.jsp
 

<%@ page session="false" %>

Flavors

Our most popular flavors are:
<%@ include file="flavor_list.html" %>
Try them all!
 
flavor_list.html
 

1. Chocolate


2. Strawberry


3. Vanilla

常当应用程序中所有的页面的某些部分（例如标题、页脚和导航栏）都相同的时候，我们就可以考虑用include。具体在哪些时候用<%@ include file=""%>，哪些时候用。这种形式

include一个页面的地址

<%@ page session="false" %>

Flavors

Our most popular flavors are:

Try them all!

根据用户提交的参数请求，我们调用不用的文件
实例

<%
   // Diameter of the earth in kilometers

   int distance = 12756;
%>
<%@ page session="false" %>

Diameter of the Earth in SI (Metric) Units

  
  

Diameter of the Earth in U.S. Customary Units

  
  

 
ShowDiameter.jsp
 

<%@ page session="false"%>
<%
   String dist = request.getParameter("dist");
   if (dist == null)
      throw new ServletException
         ("No distance parameter specified");

   int kilometers = Integer.parseInt(dist);
   double miles = kilometers / 1.609344;

   String units = request.getParameter("units");
   if (units == null)
      throw new ServletException
         ("No units parameter specified");

   if (units.equals("SI")) {
   %> Diameter = <%= kilometers %> km <%
   }
   else {
   %> Diameter = <%= miles %> miles <%
   }
%>