📄 sessionsnoop.java

📁 java servlet编程源码
💻 JAVA
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import 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 {
    res.setContentType("text/html");
    PrintWriter out = res.getWriter();

    // Get the current session object, create one if necessary
    HttpSession session = req.getSession();

    // 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.getAttribute("snoop.count");
    if (count == null)
      count = new Integer(1);
    else
      count = new Integer(count.intValue() + 1);
    session.setAttribute("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>");
    Enumeration enum = session.getAttributeNames();
    while (enum.hasMoreElements()) {
      String name = (String) enum.nextElement();
      out.println(name + ": " + session.getAttribute(name) + "<BR>");
    }

    out.println("<H3>Here are some vital stats on your session:</H3>");
    out.println("Session id: " + session.getId() +
                " <I>(keep it secret)</I><BR>");
    out.println("New session: " + session.isNew() + "<BR>");
    out.println("Timeout: " + session.getMaxInactiveInterval());
    out.println("<I>(" + session.getMaxInactiveInterval() / 60 + 
                " minutes)</I><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>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>");
  }
}
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