Untitled

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="data.StringConstants" %>
<html>
<head>
<title>File Chooser</title>
<link rel="stylesheet" href="${pageContext.request.contextPath}/css/main.css">
<link href="https://fonts.googleapis.com/css?family=Lato:700i"
	rel="stylesheet">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $('#submit').click(function(event){
    	console.log("Clicked");
        event.preventDefault();
        //alert('testing');
        var file = $("#fileName").val();
        console.log(file);
        var servlet = '${pageContext.request.contextPath}/FileChooserServlet';
        $.ajax({
        	type: 'GET',
        	url: servlet,
        	data: {infile: file},
        	success: function(data) {
        		// check data for error
        		console.log(data);
        		if (data.includes("ERROR:")) {
	           		var errorMessage = data;
	           		document.getElementById('error').innerHTML = errorMessage;
	           		return false;
        		} else {
        			window.location = '${pageContext.request.contextPath}/jsp/login.jsp';
        		}
        	},
        	error: function(data){
      	       alert("fail");
        	}
        });
    });
});
</script>
</head>
<body>
	<div id="title_container">Cinemate</div>

	<div id="welcome_text">
		Welcome to Cinemate, a Movie Social Media Medium.
		<br>
		Please input a file so that you may begin your experience.
	</div>
	<div id="outer_container">
		<div id="inner_container">
			<form name="filechooser">
				<input style = "width: 72%; margin-right: 5px;" type="text" id="fileName" name="<%= StringConstants.INFILE%>">
				<input style = "width: 20%;" type="submit" id = "submit" name="submit">
 				<div class=error_message>
 					<div id="error">
 						<!-- if there is an error display it, else display the empty string -->
 					</div>
				</div>
			</form>
		</div>
	</div>
</body>
</html>


package servlets;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import data.DataStorage;
import data.StringConstants;


@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

    public LoginServlet() {
        super();
    }

	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		HttpSession session = request.getSession(true);
		DataStorage ds = (DataStorage) session.getAttribute(StringConstants.DATA);
		//get username and password
		String username = (String)request.getParameter(StringConstants.USERNAME);
		String password = (String)request.getParameter(StringConstants.PASSWORD);
		//if it is a valid username
		if (ds.validUsername(username)){
			//correct password
			if (ds.correctPassword(username, password)){
				ds.setLoggedInUser(username);
				response.sendRedirect(StringConstants.JSP_EXT+StringConstants.MENU_JSP);
			}
			//incorrect password
			else{
				request.setAttribute(StringConstants.ERROR, "Incorrect password");
				PrintWriter out = response.getWriter();
				out.print("ERROR:" + " Incorrect password");
				out.flush();
				//request.getRequestDispatcher(StringConstants.JSP_EXT+StringConstants.LOGIN_JSP).forward(request, response);
			}
		}
		//invalid username
		else{
			request.setAttribute(StringConstants.ERROR, "Invalid username");
			PrintWriter out = response.getWriter();
			out.print("ERROR:" + " Invalid username");
			out.flush();
			//request.getRequestDispatcher(StringConstants.JSP_EXT+StringConstants.LOGIN_JSP).forward(request, response);
		}
	}
}