import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import java.util.*; public class TestLogin extends HttpServlet { static final boolean debug = false; public void doGet (HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // Set the content type of the response etc. resp.setContentType ("text/html"); PrintWriter out = resp.getWriter (); out.println (" Visit Count"); // During debugging, it helps to print out the parameters in the response. if (debug) { printParams (out, req); } // Write out the action, since that's common to all. // CHANGE TO YOUR PORT NUMBER! out.println ("
"); // IF RUNNING THE WEBSERVER ON YOUR LAPTOP: // out.println (""); // Get the page info from hidden fields: String whichPage = req.getParameter ("page"); String userName = req.getParameter ("username"); // Determine action based on which page fired the request and // handle in appropriate method. if (whichPage.equalsIgnoreCase ("loginpage")) { handleLoginPage (out, userName); } else if (whichPage.equalsIgnoreCase ("menupage")) { handleMenuPage (out, userName, req); } else { handleError (out); } // Last part. out.println ("
"); out.flush(); } public void doPost (HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // We need to implement POST because the forms are written as such. doGet (req, resp); } void handleLoginPage (PrintWriter out, String userName) { out.println ("Hello " + userName + "! Choose from these options: "); // The two buttons. out.println (""); out.println (""); // Write out the extracted username: out.println (""); out.println (""); } void handleMenuPage (PrintWriter out, String userName, HttpServletRequest req) { // Check which button was pressed: String timeButtonPressed = req.getParameter ("Time"); out.println (userName + ", "); if (timeButtonPressed != null) { // Time event. Date d = new Date (); out.println ("the date/time is: " + d + "."); } else { // Fortune event. String fortune = ""; if ( (int)userName.charAt(0) % 2 == 0) { fortune = "go out, meet people. Tomorrow is going to be great for you."; } else { fortune = "stay at home. Tomorrow is going to be a lousy day for you."; } out.println (fortune); } } void handleError (PrintWriter out) { out.println ("Enter username: "); out.println (""); out.println (""); } // For debugging: void printParams (PrintWriter out, HttpServletRequest req) { out.println ("

Request parameters:

"); } }