jsp-avaBean

 1 package javaBean;
 2 
 3 public class pagecount {
 4 
 5     private long count=0;
 6 
 7     public long getcount()
 8     {
 9         return count;
10     }
11     public void setcount(long count)
12     {
13         this.count=count;
14     }
15     public void add()
16     {
17         count++;
18     }
19     
20 }

 1 <%@page import="javaBean.pagecount"%>
 2 <%@ page language="java" contentType="text/html; charset=UTF-8"
 3     pageEncoding="UTF-8"%>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 <html>
 6 <head>
 7 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 8 <title>Insert title here</title>
 9 </head>
10 <body>
11 <%
12 Object obj=application.getAttribute("pagecount");
13 if(obj==null)
14 {
15     pagecount pc=new pagecount();
16     application.setAttribute("pagecount", pc);
17     obj=pc;
18     }
19 pagecount pagec=(pagecount)obj;
20 pagec.add();
21 out.print("计数器="+pagec.getcount());
22 %>
23 </body>
24 </html>

练习版：

 1 package javaBean;
 2 
 3 public class JavaB3 {
 4 
 5     private long count=0;
 6     public long getcount()
 7     {
 8         return count;
 9     }
10     public void setcount(long count)
11     {
12         this.count=count;
13     }
14     public void add()
15     {
16         count++;
17     }
18     
19 }

 1 <%@page import="javaBean.JavaB3"%>
 2 <%@ page language="java" contentType="text/html; charset=UTF-8"
 3     pageEncoding="UTF-8"%>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 <html>
 6 <head>
 7 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 8 <title>Insert title here</title>
 9 </head>
10 <body>
11 <%
12 Object obj=application.getAttribute("JavaB3");
13 if(obj==null)
14 {
15   JavaB3 jb3=new JavaB3();
16   application.setAttribute("JavaB3", jb3);
17   obj=jb3;
18 }
19 JavaB3 jb=(JavaB3)obj;
20 jb.add();
21 out.print("<br>计数器："+jb.getcount());
22 %>
23 </body>
24 </html>