📄 sessiontracker.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 SessionTracker 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 "tracker.count".
    Integer count = (Integer)session.getAttribute("tracker.count");
    if (count == null)
      count = new Integer(1);
    else
      count = new Integer(count.intValue() + 1);
    session.setAttribute("tracker.count", count);

    out.println("<HTML><HEAD><TITLE>SessionTracker</TITLE></HEAD>");
    out.println("<BODY><H1>Session Tracking Demo</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("<H2>Here is your session data:</H2>");
    Enumeration enum = session.getAttributeNames();
    while (enum.hasMoreElements()) {
      String name = (String) enum.nextElement();
      out.println(name + ": " + session.getAttribute(name) + "<BR>");
    }
    out.println("</BODY></HTML>");
  }
}

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