I created a login form, when i login using correct username and password it works fine. I want to pop up an error message or error page when i enter wrong username or password. That means the controller will compare the given username with all the usernames in database and if don't find the given username, then it needs to display an error message or error page.
Is this possible in HTML or JavaScript?
<html>
<body>
<form action="search" onsubmit="return validateForm()">
<table>
<tr><td>Username</td>
<td><input type=text name=LoginId /></td></tr>
<tr><td>Password</td>
<td><input type=password name=LoginPassword /> </td></tr>
<tr><td colspan=2>
<center>
<input type=submit value=SignIn /><br>If you forgot your password, <a href="ResetPassword"> Reset </a>your password.</center></td></tr>
</table>
</form>
</body>
</html>
SearchServlet.java
/**
* @see HttpServlet#HttpServlet()
*/
public SearchServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
CustomerDAO customerDAO = new CustomerDAO();
String username = request.getParameter("LoginId");
String password = request.getParameter("LoginPassword");
Login login = customerDAO.getLoginByName(username, password);
PrintWriter out = response.getWriter();
out.println("<html><body>");
out.println("<center><h1>User Information</h1></center>");
out.println("<center><table border=0x>");
out.println("<tr>");
out.println("<td>Login Id : </td><td>"+login.getLoginId()+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>City : </td><td>"+login.getCity()+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>State : </td><td>"+login.getState()+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>Cell Number : </td><td>"+login.getCellnumber()+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>Email :</td><td>"+login.getEmail()+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>Address :</td><td>"+login.getAddress()+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>ZipCode : </td><td>"+login.getZipcode()+"</td>");
out.println("</tr>");
out.println("</table></center>");
out.println("<p>If these details are correct press continue or to change your information press update.</p>");
out.println("<form action='Continue.jsp'>");
out.println("<center><input type=submit value=continue></center>");
out.println("</form>");
out.println("<form action='search'>");
out.println("<center><a href=Update?City="+login.getCity()+"&State="+login.getState()+"&PhoneNumber="+login.getCellnumber()+"&Email="+login.getEmail()+"&Address="+login.getAddress()+"&ZipCode="+login.getZipcode()+"> update </a></center>");
out.println("</form>");
out.println("</body></html>");
Login l = new Login();
l.setLoginId(request.getParameter("LoginId"));
if(l!=null) {
HttpSession session = request.getSession();
session.setAttribute("l", l);
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
CustomerDAO.java
public class CustomerDAO extends BaseDAO{
public Login getLoginByName(String username, String password) {
Login login = null;
try {
BaseDAO baseDAO = new BaseDAO();
Connection c =baseDAO.getConnection();
// String query = "select * from test.Login where LoginId=? && LoginPassword=?";
String query = "select * from test.Customer where LoginId=? && LoginPassword=?";
PreparedStatement ps = c.prepareStatement(query);
ps.setString(1, username);
ps.setString(2, password);
ResultSet rs = ps.executeQuery();
while(rs.next()) {
login = new Login();
login.setLoginId(rs.getString("LoginId"));
login.setCity(rs.getString("City"));
login.setState(rs.getString("State"));
login.setCellnumber(rs.getString("PhoneNumber"));
login.setEmail(rs.getString("Email"));
login.setAddress(rs.getString("Address"));
login.setZipcode(rs.getInt("ZipCode"));
System.out.println();
}
c.close();
}catch(Exception e) {
System.err.println("Username or Password you enterd is incorrect.");
}
return login;
}
Is there a way to create simple error message in the servlet? but i need to reload the page again.
Thank You.
