jsp中的作用域对象

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'a.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">

  </head>
  
  <body>
  <%--在a.jsp中存储四个数据 --%>
  <%
  pageContext.setAttribute("page", "page数据", pageContext.PAGE_SCOPE);
  pageContext.setAttribute("request", "request数据", pageContext.REQUEST_SCOPE);
  session.setAttribute("session", "session数据");
  application.setAttribute("application", "application数据");
   %>
  以下是取到的值<br/>
 page:<%=pageContext.getAttribute("page",pageContext.PAGE_SCOPE)%><br/>
 request:<%=request.getAttribute("request")%><br/>
session:<%=session.getAttribute("session")%><br/>
application:<%=application.getAttribute("application")%><br/>
  
  <%//pageContext.forward("b.jsp"); %>
  <%//response.sendRedirect("b.jsp"); //重定向%>
  <%pageContext.include("b.jsp"); %><br/>
  <%//@include file="b.jsp"//include指令 %>
  
  我是a页面
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>b页面</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
  以下是b页面中存储的数据:<br/>
 <div style="background-color:fuchsia;high:300px">
 page:<%=pageContext.getAttribute("page",pageContext.PAGE_SCOPE)%><br/>
 request:<%=request.getAttribute("request")%><br/>
session:<%=session.getAttribute("session")%><br/>
application:<%=application.getAttribute("application")%><br/>
 </div>
  </body>
</html>

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