server.servlets.SessionExample (Java2HTML)

package server.servlets;

/* $Id: SessionExample.java,v 1.3 1999/04/10 05:22:10 duncan Exp $
 *
 */

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import java.util.ResourceBundle;


/**
 * Example servlet showing request headers
 *
 * @author James Duncan Davidson <duncan@eng.sun.com>
 */

public class SessionExample extends HttpServlet {

    ResourceBundle rb = ResourceBundle.getBundle("LocalStrings");

    public void doGet(HttpServletRequest request,
                      HttpServletResponse response)
            throws IOException, ServletException {
        response.setContentType("text/html");

        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<body bgcolor=\"white\">");
        out.println("<head>");

        String title = rb.getString("sessions.title");
        out.println("<title>" + title + "</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<p>sw409 sessions</p>");

        // img stuff not req'd for source code html showing
        // relative links everywhere!

        out.println("<a href=\"../servlets/sessions.html\">");
        out.println("<img src=\"../images/code.gif\" height=24 " +
                "width=24 align=right border=0 alt=\"view code\"></a>");
        out.println("<a href=\"../servlets/index.html\">");
        out.println("<img src=\"../images/return.gif\" height=24 " +
                "width=24 align=right border=0 alt=\"return\"></a>");

        out.println("<h3>" + title + "</h3>");

        // How to get an HttpSession

        HttpSession session = request.getSession();
        out.println(rb.getString("sessions.id") + " " + session.getId());
        out.println("<br>");
        out.println(rb.getString("sessions.created") + " ");
        out.println(new Date(session.getCreationTime()) + "<br>");
        out.println(rb.getString("sessions.lastaccessed") + " ");
        out.println(new Date(session.getLastAccessedTime()));

        String dataName = request.getParameter("dataname");
        String dataValue = request.getParameter("datavalue");
        if (dataName != null && dataValue != null) {
            session.putValue(dataName, dataValue);
        }

        out.println("<P>");
        out.println(rb.getString("sessions.data") + "<br>");
        String[] valueNames = session.getValueNames();
        if (valueNames != null && valueNames.length > 0) {
            for (int i = 0; i < valueNames.length; i++) {
                String name = valueNames[i];
                String value = session.getValue(name).toString();
                out.println(name + " = " + value + "<br>");
            }
        }

        out.println("<P>");
        out.print("<form action=\"");
        out.print("SessionExample\" ");
        out.println("method=POST>");
        out.println(rb.getString("sessions.dataname"));
        out.println("<input type=text size=20 name=dataname>");
        out.println("<br>");
        out.println(rb.getString("sessions.datavalue"));
        out.println("<input type=text size=20 name=datavalue>");
        out.println("<br>");
        out.println("<input type=submit>");
        out.println("</form>");

        out.println("</body>");
        out.println("</html>");

        out.println("</body>");
        out.println("</html>");
    }

    public void doPost(HttpServletRequest request,
                       HttpServletResponse response)
            throws IOException, ServletException {
        doGet(request, response);
    }

}