(九)包含指令 (JSP学习第二天)

静态包含：<%@ include file="要包含的文件的路径">
 
 定义三个要包含的文件info.html,info.jsp,info.inc
 info.html文件内容：

 <h1>
 <font color="red">info.html</font>
 </h1>

 info.jsp文件内容:

 <h1>
 <font color="green"><%="info.jsp"%></font>
 </h1>

info.inc文件内容：

 <h1>
 <font color="yellow">info.inc</font>
 </h1>


 
 使用静态包含三个文件：include_demo01.jsp

 <%@ page language="java" contentType="text/html" pageEncoding="GBK"%>
 <html>
 <head>
 <title>测试</title>
 </head>
 <body>
 <h1>静态包含</h1>
 <%@include file="info.html" %>
 <%@include file="info.jsp" %>
 <%@include file="info.inc" %>
 </body>
 </html>


 
 
 动态包含:
 <jsp:include page="包含的文件"/>
 传递参数的：
 <jsp:include page="包含的文件">
 <jsp:param name="参数名称" value="参数内容"/>
 .........
</jsp:include>

用动态包含三个文件：include_demo02.jsp

<%@ page language="java" contentType="text/html" pageEncoding="GBK"%>
 <html>
 <head>
 <title>测试</title>
 </head>
 <body>
 <h1>动态包含</h1>
 <jsp:include page="info.html"/>
 <jsp:include page="info.jsp"/>
 <jsp:include page="info.inc"/>
 </body>
 </html>


 
 定义包含文件,并传递参数 include_demo03.jsp

 <%@ page language="java" contentType="text/html" pageEncoding="GBK"%>
  <html>
 <head>
 <title>测试</title>
 </head>
 <body>
 <%
 String username="xiaoming";
 %>
 <jsp:include page="receive_param.jsp"/>
 <jsp:param name="name" value="<%=username%>"/>
 <jsp:param name="info" value="ceshi"/>
 </body>
 </html>


 
接收传递的参数:receive_param.jsp

 <%@ page language="java" contentType="text/html" pageEncoding="GBK"%>
 <html>
 <head>
 <title>测试</title>
 </head>
 <body>
 <h1>参数一:<%=request.getParameter("name")%></h1>
 <h2>参数二:<%=request.getParameter("info")%>
 </body>
 </html>


 
 开发时用动态包含,可以避免一些不必要的错误,比如变量重复定义

 例如:被包含的动态页include.jsp
 <%
 int x=10;
 %>
 <h1>include.jsp--<%=x%></h1>
 
 静态包含处理页:include_demo04.jsp

 <%@ page language="java" contentType="text/html" pageEncoding="GBK"%>
  <html>
 <head>
 <title>测试</title>
 </head>
 <body>
 <%
 int x=100;
 %>
 <%@ include file="include.jsp"%>
 </body>
 </html>

 运行时报错,是因为相同的变量重复定义!
 
 动态包含处理页:include_demo05.jsp

  <%@ page language="java" contentType="text/html" pageEncoding="GBK"%>
  <html>
 <head>
 <title>测试</title>
 </head>
 <body>
 <%
 int x=100;
 %>
 <jsp:include page="include.jsp"/>
 </body>
 </html>
posted @ 2011-09-26 15:59  techstan  阅读(1087)  评论(0)    收藏  举报