Login Page:
Login.html:
<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width">
</head>
<body bgcolor="lightblue">
<br><br> <br><br>
<!--(comment line ) download the jquery plugin 2 lines -->
<script type = "text/javascript" src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.19.1/jquery.validate.min.js"></script>
<script>
jQuery(document).ready(function($) {
$("#login").validate({
ignore: [],
rules: {
name: {
required: true
},
pw: {
required: true,
minlength: 6
},
},
messages: {
name: {
required: "Please enter the name."
},
pw: {
required: "Please enter the password.",
minlength: "Please enter the password greater than 6.",
},
}
});
});
</script>
<style>
.error{
color:red;
}
.button{
padding: 5px;
width: 6%;
background: cornflowerblue;
color: white;
}
</style>
<center>
<form method="POST" id="login" action="login">
<font color="blue" size="4">
<h2> Login module </h2>
</font>
<div>
<table>
<tr>
<td> Email ID: </td>
<td> <input type="text" name="email"/></td>
</tr>
<br><br>
<tr>
<td> Password: </td>
<td> <input type="password" name="pw"/></td>
</tr>
</table>
<div style="text-align: center;margin-left: 70px;margin-top: 10px;">
<input type="submit" class="button" value="login"/>
</div>
</div>
</form>
</center>
</body>
</html>
Package name:handler
Servlet name: login
package handler;
import DAO.user;
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;
@WebServlet(name = "login", urlPatterns = {"/login"})
public class login extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
HttpSession session = request.getSession();
try (PrintWriter out = response.getWriter()) {
String email = request.getParameter("email");
String pass = request.getParameter("pw");
user u = new user(session);
String status = u.login(email, pass);
if (status.equals("success")) {
//The RequestDispatcher interface provides the facility of
//dispatching the request to another resource it may be html, servlet or jsp.
RequestDispatcher rd1 = request.getRequestDispatcher("success.jsp");
//The getRequestDispatcher() method of ServletRequest interface returns the object //of RequestDispatcher
rd1.forward(request, response);
// Forwards a request from a servlet to another resource (servlet, JSP file, or //HTML file) on the server.
} else if (status.equals("failure")) {
RequestDispatcher rd1 = request.getRequestDispatcher("failure.jsp");
rd1.forward(request, response);
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
}
Package name:DAO
Class name:user.java
package DAO;
import java.sql.*;
import javax.servlet.http.HttpSession;
public class user
{
Connection con;
Statement st;
ResultSet rs = null;
String status = "";
HttpSession se;
student s;
public user(HttpSession session) {
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/sookshmas", "root", "root");
se = session;
} catch (Exception e) {
e.printStackTrace();
}
}
public String login(String email,String pass)
{
try
{
st=con.createStatement();
rs=st.executeQuery("select * from sookshmas where email='"+email+"' and password='"+ pass+"' ");
boolean b=rs.next();
if(b==true)
{
name = rs.getString("name");
se.setAttribute("uname", name);
//public void setAttribute(String name, Object value): Binds the object with a name and stores the //name/value pair as an attribute of the HttpSession object.
status="success";
}
else
{
status="failure";
}
}
catch(Exception e)
{
e.printStackTrace();
}
return status;
}
}
Success.jsp:
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<%-- comment lines public Object getAttribute(String name): Returns the String object specified in the parameter, from the session object. --%>
<%
String name = (String)request.getSession().getAttribute("uname");
out.println("<html>");
out.println("<body bgcolor='lightgreen'>");
out.println("<center><br><br>");
out.print("<h1>Hello "+name +"</h1>");
%>
<%-- comment lines --%>
<%-- or( we can write the below code also
<%if (session.getAttribute("uname") != null) {%>
<h1>Hello <%= session.getAttribute("uname")%></h1>
<%}%>
</body>
</html>
--%>
</body>
</html>
failure.jsp:
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<%
out.println("<html>");
out.println("<body bgcolor='lightgreen'>");
out.println("<center><br><br>");
out.print("<h1>Hello login failed </h1> ");
%>
</body>
</html>
