code371.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<jsp:useBean id="page_teacher" scope="page" class="pack09.code367"></jsp:useBean>
<jsp:useBean id="request_teacher" scope="request" class="pack09.code367"></jsp:useBean>
<jsp:useBean id="session_teacher" scope="session" class="pack09.code367"></jsp:useBean>
<jsp:useBean id="application_teacher" scope="application" class="pack09.code367"></jsp:useBean>
<h3>移除javabean前，访问对象</h3>
page: ${!empty page_teacher}<br>
request:${!empty request_teacher }<br>
session: ${!empty session_teacher }<br>
application: ${!empty application_teacher }<br>
<%
pageContext.removeAttribute("page_teacher");
request.removeAttribute("request_teacher");
session.removeAttribute("session_teacher");
application.removeAttribute("application_teacher");
%>
<h3>移除javabean后，访问对象</h3>
page: ${!empty page_teacher}<br>
request:${!empty request_teacher }<br>
session: ${!empty session_teacher }<br>
application: ${!empty application_teacher }<br>
</body>
</html>