/** *****************************************************************
loginDemo.java SWE 642 Student Information
@author Jeff Offutt
@version 1.0 (2/21/2004)
@version 2.0 (Jan 2009)
Port to CS server
Establishes a login using a servlet session.
IDs are hardcoded.
doGet() prints the login screen.
doPost() checks an ID/password and sets the session info.
********************************************************************* */
package studInfoDemo;
// Import Servlet Libraries
import javax.servlet.*;
import javax.servlet.http.*;
// Import Java Libraries
import java.io.*;
import java.util.*;
import java.lang.*;
// login class
//
//***********************************************************************
public class loginDemo extends HttpServlet
{
private static String LoginServlet = "http://cs.gmu.edu:8080/offutt/servlet/studInfoDemo.loginDemo"; // cs
private static String JSPLoc = "http://cs.gmu.edu:8080/offutt/jsp/"; // cs
public static String classWebSiteURL = "http://www.cs.gmu.edu/~offutt/classes/642/";
public static String FileName = "/var/www/CS/webapps/offutt/WEB-INF/data/demo-info.xml"; // CS
// Form parameters.
private static String userIDDemo;
private static String passWord;
// doPost() tells doGet() when the login is invalid.
private static boolean invalidID = false;
private static String fromJSP;
/** *****************************************************
* Overrides HttpServlet's doGet().
* prints the login form.
********************************************************* */
public void doGet (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
fromJSP = req.getParameter ("jspFrom");
res.setContentType ("TEXT/HTML");
PrintWriter out = res.getWriter ();
out.println ("");
out.println ("");
out.println ("");
out.println (" SWE 642 Information Form");
out.println ("");
out.println ("");
out.println ("");
out.println ("Login form to the student information system");
if (invalidID)
{ // called from doPost(), invalid ID entered.
invalidID = false;
out.println ("
Invalid user ID, password pair. Please try again.
");
}
out.println ("");
// Put the initial focus in the user id box.
out.println (" ");
out.println ("");
out.println ("");
out.close ();
}
/** *****************************************************
* Overrides HttpServlet's doPost().
********************************************************* */
public void doPost (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
userIDDemo = req.getParameter ("UserIDDemo");
passWord = req.getParameter ("PassWord");
fromJSP = req.getParameter ("jspFrom");
HttpSession session = req.getSession (true);
session.setMaxInactiveInterval (60*60*12); // 12 hour sessions
if (userIDDemo.equals ("demo") && passWord.equals ("demo"))
{ // successful
session.setAttribute ("isLoginDemo", "Yes");
session.setAttribute ("UserIDDemo", userIDDemo);
// OKAY ... forward to JSP from "fromJSP"
res.sendRedirect (JSPLoc + fromJSP);
}
else
{ // unsuccessful
session.setAttribute ("isLoginDemo", "No");
session.setAttribute ("UserIDDemo", "");
invalidID = true;
doGet (req, res);
}
} // end of doPost() method
} // end of loginDemo class