JSP-include指令

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JSP-include指令

用法：

<%@ include file="路径" %>

a1.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>    <h2>a1 Page</h2></body></html>

a2.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>    <h2>a2 Page</h2>    <%@ include file="/WEB-INF/a1.jsp"%></body></html>

运行：
这里写代码片

动态包含和静态包含的区别
静态包含：
a1.jsp

<h2>a2 Page</h2><%    String s = "abcd";%><%@ include file="/WEB-INF/a1.jsp"%>

a2.jsp

<h2>a1 Page</h2><%= s %>

运行：
这里写图片描述
动态包含：
用法：

<jsp:include page="路径"></jsp:include>

a2.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>    <h2>a2 Page</h2>    <jsp:include page="/WEB-INF/a1.jsp"></jsp:include></body></html>

a1.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>    <h2>a1 Page->动态包含</h2></body></html>

运行：
这里写图片描述
但是如果使用刚才的例子，会出现空指针异常，因为动态包含其实在
底层生成的是两个java文件，而静态包含是一个java文件

动态包含传递参数：
a2.jsp:

<h2>a2 Page</h2><%    request.setCharacterEncoding("UTF-8");%><jsp:include page="/WEB-INF/a1.jsp">    <jsp:param value="猴赛雷" name="name"/></jsp:include>

a1.jsp

<h2>a1 Page->动态包含</h2><%= request.getParameter("name") %>

运行：
这里写图片描述

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