版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
一、JavaBean
1.Count.java
package bean;
public class Counter{
public Counter(){
}
private int Count=0;
public void setCounter(int count) {
Count = count;
}
public int getCounter( ) {
return ++Count;
}
}
二、page、request、session、application
1.page.jsp
<%@ 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 'usingCounter.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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<div><h2><jsp:useBean id="count" scope="page" class="bean.Counter"></jsp:useBean>
<font color="red">演示：page</font></h2></div>
<br>
<br>
您是本站第
<font color=blue>
<jsp:getProperty name="count" property="counter"/>
</font>
位参观者
</body>
</html>
2.request
2.1 request.jsp
<%@ 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 'usingCounter.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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<div><h2><jsp:useBean id="count" scope="request" class="bean.Counter"></jsp:useBean>
<font color="red">演示：request</font></h2></div>
<br>
<br>
您是本站第
<font color=blue>
<jsp:getProperty name="count" property="counter"/>
</font>
位参观者
<jsp:forward page="2.request2.jsp"></jsp:forward>
</body>
</html>
2.2 request2.jsp
<%@ 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 'usingCounter.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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<div><h2><jsp:useBean id="count" scope="request" class="bean.Counter"></jsp:useBean>
<font color="red">演示：request</font></h2></div>
<br>
<br>
您是本站第
<font color=blue>
<jsp:getProperty name="count" property="counter"/>
</font>
位参观者
<jsp:forward page="2.request2.jsp"></jsp:forward>
<br>
<!-- <a href="2.request2.jsp">链接转跳到2.request2.jsp</a> -->
</body>
</html>
3.session.jsp
<%@ 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 'usingCounter.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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<div><h2><jsp:useBean id="count" scope="session" class="bean.Counter"></jsp:useBean>
<font color="red">演示：session</font></h2></div>
<br>
<br>
您是本站第
<font color=blue>
<jsp:getProperty name="count" property="counter"/>
</font>
位参观者
</body>
</html>
4.application.jsp
<%@ 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 'usingCounter.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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<div><h2><jsp:useBean id="count" scope="application" class="bean.Counter"></jsp:useBean>
<font color="red">演示：application</font></h2></div>
<br>
<br>
您是本站第
<font color=blue>
<jsp:getProperty name="count" property="counter"/>
</font>
位参观者
</body>
</html>
三、运用javaBean比较page、request、session、application的生存周期
