?? sessionpeek.java
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//: c15:servlets:SessionPeek.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Using the HttpSession class.
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SessionPeek extends HttpServlet {
public void service(HttpServletRequest req,
HttpServletResponse res)
throws ServletException, IOException {
// Retrieve Session Object before any
// output is sent to the client.
HttpSession session = req.getSession();
res.setContentType("text/html");
PrintWriter out = res.getWriter();
out.println("<HEAD><TITLE> SessionPeek ");
out.println(" </TITLE></HEAD><BODY>");
out.println("<h1> SessionPeek </h1>");
// A simple hit counter for this session.
Integer ival = (Integer)
session.getAttribute("sesspeek.cntr");
if(ival==null)
ival = new Integer(1);
else
ival = new Integer(ival.intValue() + 1);
session.setAttribute("sesspeek.cntr", ival);
out.println("You have hit this page <b>"
+ ival + "</b> times.<p>");
out.println("<h2>");
out.println("Saved Session Data </h2>");
// Loop through all data in the session:
Enumeration sesNames =
session.getAttributeNames();
while(sesNames.hasMoreElements()) {
String name =
sesNames.nextElement().toString();
Object value = session.getAttribute(name);
out.println(name + " = " + value + "<br>");
}
out.println("<h3> Session Statistics </h3>");
out.println("Session ID: "
+ session.getId() + "<br>");
out.println("New Session: " + session.isNew()
+ "<br>");
out.println("Creation Time: "
+ session.getCreationTime());
out.println("<I>(" +
new Date(session.getCreationTime())
+ ")</I><br>");
out.println("Last Accessed Time: " +
session.getLastAccessedTime());
out.println("<I>(" +
new Date(session.getLastAccessedTime())
+ ")</I><br>");
out.println("Session Inactive Interval: "
+ session.getMaxInactiveInterval());
out.println("Session ID in Request: "
+ req.getRequestedSessionId() + "<br>");
out.println("Is session id from Cookie: "
+ req.isRequestedSessionIdFromCookie()
+ "<br>");
out.println("Is session id from URL: "
+ req.isRequestedSessionIdFromURL()
+ "<br>");
out.println("Is session id valid: "
+ req.isRequestedSessionIdValid()
+ "<br>");
out.println("</BODY>");
out.close();
}
public String getServletInfo() {
return "A session tracking servlet";
}
} ///:~?? 快捷鍵說明
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