📄 tracksession.java
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import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.*;
import java.util.*;
public class TrackSession extends HttpServlet {
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException, IOException {
String heading;
Integer count;
response.setContentType("text/html");
HttpSession session = request.getSession(true);
count =(Integer)session.getAttribute("count");
if (count == null)
{
count = new Integer(0);
heading = "First visiting";
}
else
{
heading = "Welcome Back";
count = new Integer(count.intValue() + 1);
}
session.setAttribute("count", count);
PrintWriter out = response.getWriter();
String docType = "<!DOCTYRP HTML PUBLIC \"- //W3C//DTD HTML 4.0"
+ "Transitional //EN\">\n";
out.println(docType +
"<BODY BGCOLOR=\"#FDF5E6\">\n" +
"<H1 ALIGN=\"CENTER\">" + heading + "</H1>\n" +
"<TABLE BORDER=1 ALIGN=\"CENTER\">\n" +
"<TR BGCOLOR=\"#FFAD00\">\n" +
" <TH>NAME<TH>VALUE\n" +
"<TR>\n" +
" <TD>ID:\n" +
" <TD>" + session.getId() + "\n" +
"<TR>\n" +
" <TD>Creation Time:\n" +
" <TD>" +
new Date(session.getCreationTime()) + "\n" +
"<TR>\n" +
"<TD>Last Access Time:\n" +
"<TD>" +
new Date(session.getLastAccessedTime()) + "\n" +
"<TR>\n" +
" <TD>Count:\n" +
" <TD>" + count + "\n" +
"</TABLE>\n" +
"</BODY></HTML>");
}
/** doPost方法直接调用doGet */
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException, IOException
{
doGet(request, response);
}
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