login Archives - Ravi R. Oza

Watch “Servlet Part-24 | Login and Logout using Http Session & JDBC (Gujarati)” on YouTube

September 1, 2020 by Ravi Oza

Servlet #SignUp #JDBC #MySql #Eclipse #MySqlWorkBench #ApacheTomcat #Jdk #Java #DynamicLogin #Gujarati #RaviROza #CreateReadUpdateAndDelete #CRUD #Create #read #update #delete #LogIn #LogOut #SignIn # SignOut

Steps to perform the example:

Login
1. Define HttpSession when user info. (id/password) is validated
2. Add attributes to newly created session object
Logout
1. Define a servlet for user to Logout
2. Retrieve current session object
3. Remove attributes from session
4. Call invalidate() method on session object

OS : Windows 10
Jdk : Version 8
IDE : Eclipse Mars
Database : MySQL using MySql Workbench 5.2 CE
Server : Apache Tomcat 7

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https://raviroza.wordpress.com/
https://twitter.com/raviozaIT
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Watch “Servlet Part-23 | New User Registration in Servlet using JDBC (Gujarati)” on YouTube

August 31, 2020 by Ravi Oza

#Servlet #SignUp #JDBC #MySql #Eclipse #MySqlWorkBench #ApacheTomcat #Jdk #Java #DynamicLogin #Gujarati #RaviROza

This video features the Sign up operation (New User registration) using JDBC via servlet only, no JSP page is used to perform any database operation.

MySql database is used as a back end support, the table tbl_users has been created using MySql Workbench in raviroza database.

Create the following files

NewUser.html (new user registration form – client side)

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>User Registration</title>
</head>
<body>
<form action="Signup" method="post">

<h1>New User Registration (Sign up)</h1>
<hr>
<p> Username : <input type="text" name="txtUsername"> </p>
<p> Password : <input type="password" name="txtPassword"> </p>
<hr>
<p> <input type="submit" value="Sign Up">
	<input type="reset" value="Reset">
 </p>
</form>
</body>
</html>

SignUp.java (servlet to add new user details in database if user doesn’t exist)

package dynamicLogin;

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

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 java.sql.*;

@WebServlet("/Signup")
public class Signup extends HttpServlet 
{
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
	{	
		PrintWriter pw = response.getWriter();
		response.setContentType("text/html");
		
		Connection conn;
		PreparedStatement pst;
		String url,unam,pass,QRY="";
		
		url = "jdbc:mysql://localhost:3306/raviroza";
		unam = "root";
		pass = "ravi";
		
		try
		{
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection(url,unam,pass);
			String username = request.getParameter("txtUsername");
			String password = request.getParameter("txtPassword");
			QRY = "Select Username from tbl_users where Username=? and password=?";
			pst = conn.prepareStatement(QRY);
			pst.setString(1, username);
			pst.setString(2, password);
						
			if(pst.executeQuery().next())
			{
				pw.println("<h1>User Already Exist !!!</h1>");
			}
			else
			{
				QRY = "Insert into tbl_users values (?, ?)";
				pst = conn.prepareStatement(QRY);
				pst.setString(1, username);
				pst.setString(2, password);
				pst.executeUpdate();				
				pw.println("<h1>User Registration Done </h1>");
				pw.println("<p> <a href='index.html'>Login Here </a> </p>");
			}
			pw.close();
			pst.close();
			conn.close();
		}
		catch(Exception e)
		{
			pw.println("DB Error : "+e.toString());
		}
	}

}

Overall process of example:
When a new user select the “Sign Up” option from the registration page the request is sent to the SignUP Servlet, the servlet read the values of username and password from request. The new user registration module has been linked with Login module.

Servlet defines the Database connection with valid database connection information.

Prepared statement is used to check the username and password exists in users table. then, the same prepared statement is used to add new user information in database.

OS : Windows 10
Jdk : Version 8
IDE : Eclipse Mars
Database : MySQL using MySql Workbench 5.2 CE
Server : Apache Tomcat 7

follow me @
https://raviroza.wordpress.com/
https://twitter.com/raviozaIT
https://www.facebook.com/ravi.oza.it

Subscribe my channel to get latest video notification https://www.youtube.com/user/ravioza101

Watch “Servlet Part-22 | Dynamic Login in Servlet using JDBC” on YouTube

August 29, 2020 by Ravi Oza

Servlet #JDBC #MySql #Eclipse #MySqlWorkBench #ApacheTomcat #Jdk #Java #LoginApplication #DynamicLogin #Gujarati #RaviROza

This video features the Login operation using JDBC via servlet only, no JSP page is used to perform any database operation.

MySql database is used as a back end support, the table tbl_users has been created using MySql Workbench in raviroza database.

New Web Dynamic project has been used to define login application in eclipse.
Following are the resources used in project.

index.html (to read login information from client)

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Dynamic Login Application</title>
</head>
<body>
<form action="Login" method="post">

<h1>Welcome to Your Domain Login Page</h1>
<hr>
<p> Username : <input type="text" name="txtUsername"> </p>
<p> Password : <input type="password" name="txtPassword"> </p>
<hr>
<p> <input type="submit" value="Login">
	<input type="reset" value="Reset">
 </p>
</form>
</body>
</html>

Login.java (controller servlet to validate username and password )

package dynamicLogin;

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

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 java.sql.*;

@WebServlet("/Login")
public class Login extends HttpServlet 
{
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
	{
		PrintWriter pw = response.getWriter();
		response.setContentType("text/html");
		
		Connection conn;
		PreparedStatement pst;
		String url,unam,pass,QRY="";
		
		url = "jdbc:mysql://localhost:3306/raviroza";
		unam = "root";
		pass = "ravi";
				
		try
		{
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection(url,unam,pass);
			String username = request.getParameter("txtUsername");
			String password = request.getParameter("txtPassword");
			QRY = "Select * from tbl_users where Username=? and password=?";
			pst = conn.prepareStatement(QRY);
			pst.setString(1, username);
			pst.setString(2, password);
			
			if(pst.executeQuery().next())
			{
				pw.println("<h1>Welcome User, "+username+ "</h1>");
				pw.println("<p> <a href='Logout'>Logout Here </a> </p>");
			}
			else
			{
				pw.println("<h1>Invalid login details </h1>");				
			}
		}
		catch(Exception e)
		{
			pw.println("DB Error : "+e.toString());
		}
	}
}

Overall process of example:
When a client/user select the “Submit” option from the clients page the request is sent to the Login Servlet, the servlet read the values of username and password from request.

Servlet defines the Database connection with valid database connection information.

Then, prepared statement is used to execute the queries. Here i have use used the prepared statement to check the username and password is exist in users table.

OS : Windows 10
Jdk : Version 8
IDE : Eclipse Mars
Database : MySQL using MySql Workbench 5.2 CE
Server : Apache Tomcat 7

follow me @
https://raviroza.wordpress.com/
https://twitter.com/raviozaIT
https://www.facebook.com/ravi.oza.it

Subscribe my channel to get latest video notification https://www.youtube.com/user/ravioza101

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Servlet #SignUp #JDBC #MySql #Eclipse #MySqlWorkBench #ApacheTomcat #Jdk #Java #DynamicLogin #Gujarati #RaviROza #CreateReadUpdateAndDelete #CRUD #Create #read #update #delete #LogIn #LogOut #SignIn # SignOut

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#Servlet #SignUp #JDBC #MySql #Eclipse #MySqlWorkBench #ApacheTomcat #Jdk #Java #DynamicLogin #Gujarati #RaviROza

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Like this:

Servlet #JDBC #MySql #Eclipse #MySqlWorkBench #ApacheTomcat #Jdk #Java #LoginApplication #DynamicLogin #Gujarati #RaviROza

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