JSP session counter : Session « JSP « Java
- Java
- JSP
- Session
JSP session counter
//startPage.html
<html>
<head>
<title>Page 1</title>
</head>
<body>
<h1>URL Re-writing Demo</h1>
<a href="page2.jsp">Click here</a> to visit page 2.
</body>
</html>
//page2.jsp
<html>
<head>
<title>Page 2</title>
</head>
<body>
<h1>URL Re-writing Demo</h1>
<a href="<%=response.encodeURL("page1.jsp")%>">Click here</a> to visit page 1.
</body>
</html>
//page1.jsp
<html>
<head>
<title>Page 1</title>
</head>
<body>
<h1>URL Re-writing Demo</h1>
<a href="<%=response.encodeURL("page2.jsp")%>">Click here</a> to visit page 2.
</body>
</html>
///
//web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<listener>
<listener-class>com.java2s.SessionCount</listener-class>
</listener>
<taglib>
<taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/c.tld</taglib-location>
</taglib>
</web-app>
//sessionCounter.jsp
<html>
<head>
<title>Session Counter</title>
</head>
<body>
<h1>Session Counter</h1>
On this server, there are currently
<%=com.java2s.SessionCount.getNumberOfSessions()%> active sessions.
</body>
</html>
package com.java2s;
import javax.servlet.http.*;
public class SessionCount implements HttpSessionListener
{
private static int numberOfSessions = 0;
public void sessionCreated (HttpSessionEvent evt)
{
numberOfSessions++;
}
public void sessionDestroyed (HttpSessionEvent evt)
{
numberOfSessions--;
}
// here is our own method to return the number of current sessions
public static int getNumberOfSessions()
{
return numberOfSessions;
}
}
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