参考一下://Example 7-7. Snooping session informationimport java.io.*; import java.util.*; import javax.servlet.*; import javax.servlet.http.*; public class SessionSnoop extends HttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException, IOException { res.setContentType (“text/html”); PrintWriter out = res.getWriter(); // Get the current session object, create one if necessary HttpSession session = req.getSession (true); // Increment the hit count for this page. The value is saved // in this client's session under the name “snoop.count”. Integer count = (Integer)session.getValue(“snoop.count”); if (count == null) count = new Integer(1); else count = new Integer(count.intValue() + 1); session.putValue(“snoop.count”, count); out.println(“<HTML><HEAD><TITLE>SessionSnoop</TITLE></HEAD>”); out.println(“<BODY><H1>Session Snoop</H1>”); // Display the hit count for this page out.println(“You've visited this page ” + count + ((count.intValue() == 1) ? “ time.” : “ times.”)); out.println(“<P>”); out.println(“<H3>Here is your saved session data:</H3>”); String[] names = session.getValueNames(); for (int i = 0; i < names.length; i++) { out.println(names[i] + “: ” + session.getValue(names[i]) + “<BR>”); } out.println(“<H3>Here are some vital stats on your session:</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 access time: ” + session.getLastAccessedTime()); out.println(“<I>(” + new Date(session.getLastAccessedTime()) + “)</I><BR>”); out.println(“Requested session ID from cookie: ” + req.isRequestedSessionIdFromCookie() + “<BR>”); out.println(“Requested session ID from URL: ” + req.isRequestedSessionIdFromUrl() + “<BR>”); out.println(“Requested session ID valid: ” + req.isRequestedSessionIdValid() + “<BR>”); out.println(“<H3>Here are all the current session IDs”); out.println(“and the times they've hit this page:</H3>”); HttpSessionContext context = session.getSessionContext(); Enumeration ids = context.getIds(); while (ids.hasMoreElements()) { String id = (String)ids.nextElement(); out.println(id + “: ”); HttpSession foreignSession = context.getSession(id); Integer foreignCount = (Integer)foreignSession.getValue(“snoop.count”; if (foreignCount == null) out.println(0); else out.println(foreignCount.toString()); out.println(“<BR>”); } out.println(“<H3>Test URL Rewriting</H3>”); out.println(“Click <A HREF=\“” + res.encodeUrl(req.getRequestURI()) + “\”>here</A>”); out.println(“to test that session tracking works via URL”); out.println(“rewriting even when cookies aren't supported.”); out.println(“</BODY></HTML>”); } }
那可以写个HttpSessionBindingListener进行监听,维护一个全局变量
HttpSessionBindingListener 进行监听,维护全局变量值
同意
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SessionSnoop extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException, IOException {
res.setContentType (“text/html”);
PrintWriter out = res.getWriter();
// Get the current session object, create one if necessary
HttpSession session = req.getSession (true);
// Increment the hit count for this page. The value is saved
// in this client's session under the name “snoop.count”.
Integer count = (Integer)session.getValue(“snoop.count”);
if (count == null)
count = new Integer(1);
else
count = new Integer(count.intValue() + 1);
session.putValue(“snoop.count”, count);
out.println(“<HTML><HEAD><TITLE>SessionSnoop</TITLE></HEAD>”);
out.println(“<BODY><H1>Session Snoop</H1>”);
// Display the hit count for this page
out.println(“You've visited this page ” + count +
((count.intValue() == 1) ? “ time.” : “ times.”));
out.println(“<P>”);
out.println(“<H3>Here is your saved session data:</H3>”);
String[] names = session.getValueNames();
for (int i = 0; i < names.length; i++) {
out.println(names[i] + “: ” + session.getValue(names[i]) + “<BR>”);
}
out.println(“<H3>Here are some vital stats on your session:</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 access time: ” + session.getLastAccessedTime());
out.println(“<I>(” + new Date(session.getLastAccessedTime()) +
“)</I><BR>”);
out.println(“Requested session ID from cookie: ” +
req.isRequestedSessionIdFromCookie() + “<BR>”);
out.println(“Requested session ID from URL: ” +
req.isRequestedSessionIdFromUrl() + “<BR>”);
out.println(“Requested session ID valid: ” +
req.isRequestedSessionIdValid() + “<BR>”);
out.println(“<H3>Here are all the current session IDs”);
out.println(“and the times they've hit this page:</H3>”);
HttpSessionContext context = session.getSessionContext();
Enumeration ids = context.getIds();
while (ids.hasMoreElements()) {
String id = (String)ids.nextElement();
out.println(id + “: ”);
HttpSession foreignSession = context.getSession(id);
Integer foreignCount =
(Integer)foreignSession.getValue(“snoop.count”;
if (foreignCount == null)
out.println(0);
else
out.println(foreignCount.toString());
out.println(“<BR>”);
}
out.println(“<H3>Test URL Rewriting</H3>”);
out.println(“Click <A HREF=\“” +
res.encodeUrl(req.getRequestURI()) + “\”>here</A>”);
out.println(“to test that session tracking works via URL”);
out.println(“rewriting even when cookies aren't supported.”);
out.println(“</BODY></HTML>”);
}
}