import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class LoginHandler extends HttpServlet {
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setContentType("text/html");
PrintWriter out = res.getWriter();
// Get the user's account number, password, and pin
String account = req.getParameter("account");
String password = req.getParameter("password");
String pin = req.getParameter("pin");
// Check the name and password for validity
if (!allowUser(account, password, pin)) {
out.println("<HTML><HEAD><TITLE>Access Denied</TITLE></HEAD>");
out.println("<BODY>Your login and password are invalid.<BR>");
out.println("You may want to <A HREF=\"/login.html\">try again</A>");
out.println("</BODY></HTML>");
}
else {
// Valid login. Make a note in the session object.
HttpSession session = req.getSession();
session.setAttribute("logon.isDone", account); // just a marker object
// Try redirecting the client to the page he first tried to access
try {
String target = (String) session.getAttribute("login.target");
if (target != null) {
res.sendRedirect(target);
return;
}
}
catch (Exception ignored) { }
// Couldn't redirect to the target. Redirect to the site's home page.
res.sendRedirect("/");
}
}
protected boolean allowUser(String account, String password, String pin) {
return true; // trust everyone
}
}
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