📄 sessionservlet.java
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// ==================== Program Discription ==========================
// 程序名称：示例14-5 : SessionServlet.java
// 程序目的：编写会话跟踪的Servlet程序
// ==============================================================
package examples.servlets;
import java.io.*;
import java.util.Enumeration;
import javax.servlet.*;
import javax.servlet.http.*;
public class SessionServlet extends HttpServlet
{
public void doGet (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
HttpSession session = req.getSession(true);
res.setContentType("text/html");
PrintWriter out = res.getWriter();
out.println("<HEAD><TITLE> " + "SessionServlet Output " +
"</TITLE></HEAD><BODY>");
out.println("<p><img src=images/BEA_Button_Final_web.gif align=right>");
out.println("<h1> SessionServlet Output </h1>");
Integer ival = (Integer) session.getAttribute("sessiontest.counter");
if (ival==null)
ival = new Integer(1);
else
ival = new Integer(ival.intValue() + 1);
session.setAttribute("sessiontest.counter", ival);
out.println("You have hit this page <b>" + ival + "</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("Note that by default URL rewriting is not enabled " +
"because of its expensive overhead");
out.println("<p>");
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());
out.println("<br>Creation Time: " + session.getCreationTime());
out.println("<br>Last Accessed Time: " +
session.getLastAccessedTime());
out.println("</BODY>");
}
}
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