簡單看的清楚比較重要

import java.io.*;

import java.util.*;

import javax.servlet.*;

import javax.servlet.http.*;



public class SessionExample extends HttpServlet {



    public void doGet(HttpServletRequest request, HttpServletResponse response)

    throws IOException, ServletException

    {

        response.setContentType("text/html");

        PrintWriter out = response.getWriter();

        

        HttpSession session = request.getSession(true);



        // print session info



        Date created = new Date(session.getCreationTime());

        Date accessed = new Date(session.getLastAccessedTime());

        out.println("ID " + session.getId());

        out.println("Created: " + created);

        out.println("Last Accessed: " + accessed);



        // set session info if needed



        String dataName = request.getParameter("dataName");

        if (dataName != null && dataName.length() > 0) {

            String dataValue = request.getParameter("dataValue");

            session.setAttribute(dataName, dataValue);

        }



        // print session contents



        Enumeration e = session.getAttributeNames();

        while (e.hasMoreElements()) {

            String name = (String)e.nextElement();

            String value = session.getAttribute(name).toString();

            out.println(name + " = " + value);

        }

    }

}