📄 sessionservlet.java
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package com.learnweblogic.examples.ch3;
import java.io.*;
import java.text.DateFormat;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SessionServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
// Get the session object. Don't do this in real life.
// Use getSession(false) and redirect the request to log in on failure.
HttpSession session = req.getSession(true);
// Retrieve the count value from the session
Counter cntr = (Counter)
session.getAttribute("sessiontest.counter");
// Increment the counter. If the counter is not
// currently contained in the session, create it
if (null!=cntr) {
cntr.increment();
} else {
cntr = new Counter();
session.setAttribute("sessiontest.counter", cntr);
}
// set content type and obtain a PrintWriter
res.setContentType("text/html");
PrintWriter out = res.getWriter();
// then write the data of the response
out.println("<HEAD><TITLE>SessionServlet Output</TITLE></HEAD><BODY>");
out.println("<h1>SessionServlet Output</h1>");
// And print out number of times the user has hit this page:
out.println("You have hit this page <b>" + cntr.toString() +
"</b> times.<p>");
out.println("Click <a href=" + res.encodeURL("/SessionServlet") +
">here</a>");
out.println(" to ensure that session tracking is working even " +
"if cookies aren't supported.<br>");
out.println("<p>");
// Finally, demonstrate some of the more common methods in the
// HttpSession object surrounding sessions:
out.println("<h3>Request and Session Data:</h3>");
out.println("Session ID in Request: " +
req.getRequestedSessionId());
out.println("<br>Session ID in Request from Cookie: " +
req.isRequestedSessionIdFromCookie());
out.println("<br>Session ID in Request from URL: " +
req.isRequestedSessionIdFromURL());
out.println("<br>Valid Session ID: " +
req.isRequestedSessionIdValid());
out.println("<h3>Session Data:</h3>");
out.println("New Session: " + session.isNew());
out.println("<br>Session ID: " + session.getId());
DateFormat df = DateFormat.getDateTimeInstance(DateFormat.DEFAULT,DateFormat.FULL);
out.println("<br>Creation Time: " +
df.format(new Date(session.getCreationTime())));
out.println("<br>Last Accessed Time: " +
df.format(new Date(session.getLastAccessedTime())));
out.println("</BODY>");
}
class Counter implements Serializable {
private int counter;
public Counter() {
counter = 1;
}
public void increment() {
counter++;
}
public String toString() {
return String.valueOf(counter);
}
}
}
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