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Thursday, 25 April 2013

Simple Login Application Using JSP Servlets MySQL and Tomcat

index.jsp

<%--
    Document   : index
    Created on : 30 Dec, 2012, 10:39:52 PM
    Author     : Aravind Sankaran
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page language="java"  %>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>       
        <form method="get" action="/AppContextPath/LoginServlet">
        <table>               
            <tr>
                <td></td>
                <td align="left">username</td>
                <td><input type="text" name="uname"/></td>
                <td></td>                               
            </tr>
            <tr>
                <td></td>
                <td align="left">password</td>
                <td><input type="password" name="upassword"/></td>
                <td></td>
            </tr>
            <tr>
                <td></td>
                <td></td>
                <td><input type="submit" value="submit"></td>
                <td></td>
            </tr>
               
            </table>
        </form>
    </body>
</html>

UserBean.java
public class UserBean {
    private int uid;

    public int getUid() {
        return uid;
    }

    public void setUid(int uid) {
        this.uid = uid;
    }
   
     private String username;
     private String password;
     private String firstName;

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }
     private String lastName;

    public boolean isValid() {
        return valid;
    }

    public void setValid(boolean valid) {
        this.valid = valid;
    }
     public boolean valid;
}


LoginServlet.java
 import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 public class LoginServlet extends HttpServlet {
 protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try{
            UserBean user=new UserBean();
            user.setUsername(request.getParameter("uname"));
            user.setPassword(request.getParameter("upassword"));
            user=UserDAO.login(user);
          
            if(user.isValid()){
                HttpSession session=request.getSession(true);
                session.setAttribute("currentSessionUser", user);
                response.sendRedirect("userLogged.jsp");               
            }
            else{
                response.sendRedirect("index.jsp");
            }
        }
        catch(Throwable  theException){
            System.out.println("Exception is"+theException);
           
        }    
    }
}

ConnectionManager.java
import java.sql.*;
import java.util.*;
/**
 *
 * @author Aravind Sankaran
 */
public class ConnectionManager {
    static Connection con;
    static String url="jdbc:mysql://localhost:3306/databasename?";
    static String userName = "dbusername";
    static String password = "dbpassword";
   
    public static Connection getConnection() {
    try {
       Class.forName("com.mysql.jdbc.Driver");
                try {
                con = DriverManager.getConnection(url,userName,password);
                System.out.println("connection success");
                }
            catch(SQLException ex){
                System.out.println(ex);
                 }
        }
    catch(ClassNotFoundException e){
        System.out.println(e);
         //e.printStackTrace();
        }
    return con;
    }
}

UserDAO .java 

public class UserDAO {
 static Connection currentConnection = null;
    static ResultSet rs = null;
    static PreparedStatement preparedStatement = null;
    static PreparedStatement preparedStatement1 = null;
    public static UserBean login(UserBean bean){
        Statement statement=null;   
        String userName=bean.getUsername();
        String userPassword=bean.getPassword();
        String searchQuery="select * from usertable where username='"+userName+"' AND password='"+userPassword+"'";
        System.out.println("before getting connection your given user name is"+userName);
        System.out.println("before getting connection your given user password is"+userPassword);
        System.out.println("your searchQuery is"+searchQuery);
        try{
            currentConnection=ConnectionManager.getConnection();
            statement=currentConnection.createStatement();
            rs=statement.executeQuery(searchQuery);
            boolean more=rs.next();
            if(!more){
                System.out.println("not a registered user");
                bean.setValid(false);;
            }
            else if(more){
                String firstName=rs.getString("firstname");
                String lastName=rs.getString("lastname");
                System.out.println("welcome "+firstName+" "+lastName+"");               
                bean.setFirstName(firstName);
                bean.setLastName(lastName);
                bean.setValid(true);
            }
           
        }
        catch(Exception ex){
            System.out.println("login failed"+ex);
            }
        finally{
            if(rs!=null){
                try{
                    rs.close();
                    }
                catch(Exception e){}                  
                rs=null;
            }
            if(statement!=null){
                try{
                    statement.close();
                }
                catch(Exception e){}
                statement=null;
            }
            if(currentConnection!=null){
                try{
                    currentConnection.close();
                }
                catch(Exception e){}
                currentConnection=null;
            }
        }
        return bean;
    }
}

userLogged.jsp
<%--
    Document   : userLogged
    Created on : 19 Aug, 2012, 11:50:16 PM
    Author     : Aravind Sankaran
--%>

<%@page contentType="text/html" pageEncoding="UTF-8" import="packagename.UserBean"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title> User Logged Successfully</title>
    </head>
    <body>
          <table align="center">
            <%UserBean currentUser=((UserBean)(session.getAttribute("currentSessionUser")));%>              
            <tr>
                <td>&nbsp;</td>
                <td>&nbsp;</td>
                <td><font size="3"><b>Welcome</b></font></td>
                <td><font size="3"><b><%=currentUser.getFirstName()+" "+currentUser.getLastName()%></b></font></td>
                <td>&nbsp;</td>
                <td>&nbsp;</td>
            </tr>
        </table>
        <%@ include file="footer.jsp"%>
    </body>
</html>

footer.jsp
<%--
    Document   : footer
    Created on : 19 Aug, 2012, 11:50:16 PM
    Author     : Aravind Sankaran
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
this is my footer
</html>

Table Structure of usertable

+-----------+-------------+------+-----+---------+-------+
| Field     | Type        | Null | Key | Default | Extra |
+-----------+-------------+------+-----+---------+-------+
| firstname  | varchar(25) | YES  |     | NULL    |       |
| lastname  | varchar(25) | YES  |     | NULL    |       |
| username | varchar(25) | YES  |     | NULL    |       |
| password | varchar(25) | YES  |     | NULL    |       |
+-----------+-------------+------+-----+---------+-------+

jar file needed
mysql-connector-java-3.1.14-bin








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9 comments:

  1. Unknown8 July 2013 at 09:06

    nice explaination and i thing jsp is more useful then java m i right because i m student but my teacher says java is nothing if u dont no about of jsp the time of jsp.

    ReplyDelete
    Replies
    1. Aravind Sankaran Nair10 July 2013 at 20:57

      without java you cant perform any business logic with jsp..

      Delete
    2. Unknown24 November 2013 at 23:48

      Hi,
      In the above code..,include file="footer.jsp" is mentioned in userlogged.jsp...but there is no footer.jsp file..in the given code...!please can you exlain abou this..?

      Delete
    3. Aravind Sankaran Nair25 November 2013 at 09:30

      sorry..pls check the post again. i have included that file too..:)

      Delete
    4. Unknown25 November 2013 at 23:00

      Thank you...Mr.Aravind!..It is working with minute change in LoginServlet.java as follows...response.sendRedirect("userLogged.jsp"); changed into
      request.getRequestDispatcher("/WEB-INF/userLogged.jsp").forward(request, response);
      and the other thing is i want to display the ..Invalid User message to user.. not there in DB...can you help me out..?

      Thank you,
      Chandhrikha.

      Delete
    5. Unknown26 November 2013 at 05:15

      For Invalid user..in Servlet..& Error.jsp..
      request.getRequestDispatcher("/WEB-INF/Login.jsp").forward(request, response);
      }
      else{
      request.getRequestDispatcher("/WEB-INF/Error.jsp").forward(request, response);
      }
      ...Just by adding this to your code..I got what I need..Thanks a lot..:-)

      Delete
  2. Anonymous19 January 2015 at 04:11

    how to create bean class here i'm fresher in java so that am asking

    ReplyDelete
  3. PAVAN.COM14 May 2015 at 02:25

    com.mysql.jdbc.Statement cannot be cast to java.beans.Statement

    Plz help me solve this problem..

    ReplyDelete
    Replies
    1. Aravind Sankaran Nair27 August 2015 at 00:19

      statement=(Statement)currentConnection.createStatement();

      Delete

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