📄 sessiontracker.java
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import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SessionTracker extends HttpServlet
{
public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
{
res.setContentType("text/html");
PrintWriter out=res.getWriter();
HttpSession session=req.getSession(true);
Integer count=(Integer)session.getValue("tracker.count");
if(count==null)
count=new Integer(1);
else
count=new Integer(count.intValue()+1);
session.putValue("tracker.count",count);
out.println("<html><head><title>SessionTracker</title></head>");
out.println("<body><h1>Session Tracking Demo</h1>");
out.println("You've visited this page "+count+((count.intValue()==1)?"time.":" times."));
out.println("<p>");
out.println("<h2>Here is your session data:</h2>");
String[] names=session.getValueNames();
for(int i=0;i<names.length;i++)
{
out.println(names[i]+":"+session.getValue(names[i])+"<br>.");
}
out.println("</body></html>");
}
}
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