Monday, May 15, 2017

Servlet Login App Using Cookies

SQL Query for table creation and data

create table user(id INT NOT NULL AUTO_INCREMENT, username varchar(255) NOT NULL, password varchar(255) NOT NULL, primary key(id))

insert into user values(2,'anil','anil');
insert into user values(2,'test','test');

Add jars inside WebContent/WEB-INF/lib

  • javax.servlet-api-3.1.0.jar
  • mysql-connector-java-5.1.42-bin.jar

index.jsp


<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Servlet example</title>
</head>
<body>
<h1>Login app using Cookie</h1>  
<a href="login.jsp">Login</a>|  
<a href="logout">Logout</a>|  
<a href="profile">Profile</a>  
</form>

</body>
</html>

login.jsp


<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Servlet example</title>
</head>
<body>
<h1>Login Page</h1>
<form action="login" method="post">
UserName: <input type="text" name="username"/><br/><br/>
Password : <input type="text" name="password"/><br/><br/>
<input type="submit" value="Login"/>
</form>

</body>
</html>

welcome.jsp


<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Welcome</title>
</head>
<body>
<h1>Welcome to this page</h1>
<h2 style="color: green;">Congratulation: Correct  user name or password</h2><br/>
<a href="index.jsp">Index Page</a>

</body>
</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
id="WebApp_ID" version="3.1">
<display-name>LoginAppCookies</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>

<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.masterjee.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>LogOutServlet</servlet-name>
<servlet-class>com.masterjee.LogOutServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LogOutServlet</servlet-name>
<url-pattern>/logout</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>ProfileServlet</servlet-name>
<servlet-class>com.masterjee.ProfileServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ProfileServlet</servlet-name>
<url-pattern>/profile</url-pattern>
</servlet-mapping>
</web-app>

LoginServlet .java



package com.masterjee;

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

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class LoginServlet extends HttpServlet {

    /**
     * 
     */
    private static final long serialVersionUID = 4944251896777042838L;

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        RequestDispatcher dispatcher = null;

        if (Validator.validate(username, password) && LoginDao.validate(username, password)) {
            out.print("You are successfully logged in!");
            out.print("<br>Welcome, " + username);
            Cookie cookie = new Cookie("username", username);
            response.addCookie(cookie);
            dispatcher = request.getRequestDispatcher("/welcome.jsp");
            dispatcher.include(request, response);
        } else {
            out.print("sorry, username or password error!");
            dispatcher =request.getRequestDispatcher("index.jsp");
            dispatcher.include(request, response);
        }

    }
}


LoginDao.java 

package com.masterjee;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class LoginDao {
    public static boolean validate(String username, String password) {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        try {
            connection = ConnectionProvider.getInstance().getConnection();
            preparedStatement = connection.prepareStatement("select username from user where username=? and password=?");
            preparedStatement.setString(1, username);
            preparedStatement.setString(2, password);
            System.out.println("preparedStatement:"+preparedStatement);
            ResultSet resultSet = preparedStatement.executeQuery();
            if (resultSet != null) {
                return resultSet.next();
            }

        } catch (Exception e) {
            System.out.println(e);
        } finally {
            try {
                if (preparedStatement != null) {
                    preparedStatement.close();
                }
                if(connection !=null){
                    connection.close(); 
                }

            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        System.out.println("resultSet user name password not exist.....");
        return false;

    }

}


ConnectionProvider.java

package com.masterjee;

import java.sql.Connection;
import java.sql.DriverManager;

public class ConnectionProvider {
    private static ConnectionProvider connectionProvider = null;
    private static String DRIVER_NAME = "com.mysql.jdbc.Driver";
    private static String URL = "jdbc:mysql://localhost:3306/masterjee";
    private static String USER_NAME = "root";
    private static String PASSWORD = "root";

    private ConnectionProvider() {
    }

    public Connection getConnection() throws Exception {
        Class.forName(DRIVER_NAME);
        return DriverManager.getConnection(URL, USER_NAME, PASSWORD);
    }

    public static ConnectionProvider getInstance() {

        if (connectionProvider == null) {
            connectionProvider = new ConnectionProvider();
            return connectionProvider;
        }
        return connectionProvider;
    }

}

Validator .java


package com.masterjee;

public class Validator {

    public static boolean validate(String username, String password ){
        if(username !=null && !username.equals("") && password !=null && !password.equals("") ){
            return true;
        }
        return false;
    }
}

LogOutServlet.java

package com.masterjee;

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

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LogOutServlet extends HttpServlet {

    /**
     * 
     */
    private static final long serialVersionUID = 4944251896777042838L;

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out=response.getWriter(); 
        Cookie cookie =new Cookie("username", "");
        cookie.setMaxAge(0);
        response.addCookie(cookie);
        out.print("you are successfully logged out!"); 
        RequestDispatcher dispatcher = request.getRequestDispatcher("/index.jsp");
        dispatcher.include(request, response);
    }
}


ProfileServlet.java

package com.masterjee;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class ProfileServlet extends HttpServlet {

    /**
     * 
     */
    private static final long serialVersionUID = 4944251896777042838L;

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        RequestDispatcher requestDispatcher=null;
        Cookie cookie[]=request.getCookies();
        if(cookie !=null){
            if(!Arrays.asList(cookie).isEmpty() && Arrays.asList(cookie).stream().filter(c->c.getName().equals("username")).findFirst().isPresent()){  
                requestDispatcher =request.getRequestDispatcher("welcome.jsp");
                requestDispatcher.include(request, response);
            }else{
                out.print("Please login first");  
                requestDispatcher =request.getRequestDispatcher("index.jsp");
                requestDispatcher.include(request, response);
            }
        }

    }
}








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