Login Authentication using Bean and Servlet In JSP

In this section, we have developed a web application of login authentication using Bean in JSP.

Login Authentication using Bean and Servlet In JSP

Login Authentication using Bean and Servlet In JSP

     

In this section, we have developed a web application of login authentication using Bean  in JSP. Five files are used  "login.jsp", "loginbean.jsp", "welcome.jsp","LoginBean.java" and "login.java" in the code given below.

Brief description of the flow of application :

1). Create a webpage "login.jsp"  to login the user. 

2). Create a webpage "loginbean.jsp" to set the parameter using JSP Bean and forward to the Servlet page.

3). Create a bean file "LoginBean.java" to mapping the parameter from "loginbean.jsp".

4). Create a Servlet  "login.java" to validate the username and password from the database.

5). Create a webpage "welcome.jsp" display a message after successfully user login.  

 

Step:1 Create a web page  "login.jsp"  to login the user.

<html>
<head>
</head>
<body>
<form name="loginform" method="post" action="loginbean.jsp">
<br><br>
<table align="center"><tr><td><h2>Login Authentication</h2></td></tr></table>
<table width="300px" align="center" style="border:1px solid #000000;background-color:#efefef;">
<tr><td colspan=2></td></tr>
<tr><td colspan=2>&nbsp;</td></tr>
  <tr>
  <td><b>Login Name</b></td>
  <td><input type="text" name="userName" value=""></td>
  </tr>
  <tr>
  <td><b>Password</b></td>
  <td><input type="password" name="password" value=""></td>
  </tr>
  <tr>
  <td></td>
  <td><input type="submit" name="Submit" value="Submit"></td>
  </tr>
  <tr><td colspan=2>&nbsp;</td></tr>
</table>
</form>
</body>
</html>


 Step:2 To create a "loginbean.jsp" to set the parameter of the login.

<%page language="Java" import="java.sql.*" %>  
<HTML> 
<HEAD><TITLE>DataBase Search</TITLE></HEAD>  
<BODY>
<jsp:useBean id="db" scope="request" class="logbean.LoginBean" >
  <jsp:setProperty name="db" property="userName" value="<%=request.getParameter("userName")%>"/>
  <jsp:setProperty name="db" property="password" value="<%=request.getParameter("password")%>"/>
 </jsp:useBean>
<jsp:forward page="hello">
  <jsp:param name="username" value="<%=db.getUserName()%>" />
  <jsp:param name="password" value="<%=db.getPassword()%>" />
</jsp:forward> 
</body>
</html>

Step:3 To create a "LoginBean.java" to mapping the parameter of  "loginbean.jsp".

package logbean;
public class LoginBean {
  String userName="";
  String password="";
  public String getUserName() {
  return userName;
  }
  public void setUserName(String userName) {
  this.userName = userName;
  }
  public String getPassword() {
  return password;
  }
  public void setPassword(String password) {
 this.password = password;
  }
  }
  

Step:4 To create a  Servlet "login.java" for validate the user login.

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.sql.*;
import java.sql.*;
public class login extends HttpServlet
 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException,IOException{
  response.setContentType("text/html");
  PrintWriter out = response.getWriter();
  System.out.println("MySQL Connect Example.");
  Connection conn = null;
  String url = "jdbc:mysql://localhost:3306/";
  String dbName = "user_register";
  String driver = "com.mysql.jdbc.Driver";
  String userName = "root"
  String password = "root";
 String username="";
 String userpass="";
 String strQuery= ""
  Statement st=null;
  ResultSet rs=null;
  HttpSession session = request.getSession(true);
  try {
  Class.forName(driver).newInstance();
  conn = DriverManager.getConnection(url+dbName,userName,password);
  if(request.getParameter("username")!=null &&
     request.getParameter("username")!="" && request.getParameter("password")!=null &&
     request.getParameter("password")!="")
  {
  username = request.getParameter("username").toString();
  userpass = request.getParameter("password").toString();
  strQuery="select * from userregister where 
    username='"+username+"' and  password='"+userpass+"'";
 System.out.println(strQuery);
  st = conn.createStatement();
  rs = st.executeQuery(strQuery);
  int count=0;
  while(rs.next())
  {
  session.setAttribute("username",rs.getString(2));
  count++;
  }
  if(count>0)
  {
  response.sendRedirect("welcome.jsp");
  }
  else
  {
 response.sendRedirect("login.jsp");
  }
  }
  else
  {
 response.sendRedirect("login.jsp");
  }
  System.out.println("Connected to the database"); 
  conn.close();
  System.out.println("Disconnected from database");
  catch (Exception e) {
  e.printStackTrace();
  }
  }
}

Step :5 To create the webpage "welcome.jsp" to display the message after successful message.

<HTML> 
<HEAD><TITLE>Welcome</TITLE></HEAD>  
<BODY>
<br><br><br><br>
<table align="center" style="border:1px solid #000000;">
<%
if(session.getAttribute("username")!=null && session.getAttribute("username")!="")
{
String user = session.getAttribute("username").toString();
%>
<tr><td align="center"><h1>Welcome <b><%= user%></b></h1></td></tr>
<%
}
%>
</table>
</body>
<html>


Output:

Login Authentication form :


After Successful Login user :


Download the application