@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String url = "/index.html";
// get current action
String action = request.getParameter("action");
if (action == null) {
action = "join"; // default action
}
// perform action and set URL to appropriate page
if (action.equals("join")) {
url = "/index.jsp"; // the "join" page
} else if (action.equals("add")) {
// get parameters from the request
String firstName = request.getParameter("firstName");
String lastName = request.getParameter("lastName");
String email = request.getParameter("email");
// store data in User object
User user = new User();
user.setEmail(email);
user.setFirstName(firstName);
user.setLastName(lastName);
// validate the parameters
String message;
if (UserDB.emailExists(user.getEmail())) {
message = "This email address already exists.<br>" + "Please enter another email address.";
url = "/index.jsp";
} else {
message = "";
url = "/thanks.jsp";
UserDB.insert(user);
}
request.setAttribute("user", user);
request.setAttribute("message", message);
}
getServletContext().getRequestDispatcher(url).forward(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession();
String url = "/index.jsp";
// get current action
String action = request.getParameter("action");
if (action == null) {
action = "display_users"; // default action
}
// perform action and set URL to appropriate page
if (action.equals("display_users")) {
// get list of users
List<User> users = UserDB.selectUsers();
// set list as a request attribute
// forward to index.jsp
} else if (action.equals("display_user")) {
// get specified email
// get user for email
// set as session attribute
// forward to user.jsp
} else if (action.equals("update_user")) {
// get user from session
// get new data from request
// update user
// update user in database
// get current list of users
// set as request attribute
// forward to index.jsp
} else if (action.equals("delete_user")) {
// get the user for the specified email
// delete the user
// get current list of users
// set as request attribute
// forward to index.jsp
}
getServletContext().getRequestDispatcher(url).forward(request, response);
}