Session Management

PHOTO EMBED

Sun Nov 03 2024 18:16:43 GMT+0000 (Coordinated Universal Time)

Saved by @login123 

//login.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login Page</title>
</head>
<body>
    <h2>Login</h2>
    <form action="LoginServlet" method="post">
        Username: <input type="text" name="username" required><br><br>
        <input type="submit" value="Login">
    </form>
</body>
</html>

//Login Servlet.java
import java.io.IOException;
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("/LoginServlet")
public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String username = request.getParameter("username");

        // Create a new session or retrieve existing one
        HttpSession session = request.getSession();
        
        // Store the username in the session
        session.setAttribute("username", username);

        // Redirect to welcome page
        response.sendRedirect("welcome.jsp");
    }
}
//welcome.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="javax.servlet.http.HttpSession" %>
<%
    HttpSession session = request.getSession(false); // Get existing session
    String username = null;

    if (session != null) {
        username = (String) session.getAttribute("username");
    }

    if (username == null) {
        response.sendRedirect("login.html"); // Redirect to login if not logged in
    }
%>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Welcome</title>
</head>
<body>
    <h2>Welcome, <%= username %>!</h2>
    <a href="LogoutServlet">Logout</a> <!-- Link to logout -->
</body>
</html>
//logout.java

import java.io.IOException;
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("/LogoutServlet")
public class LogoutServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // Invalidate the session
        HttpSession session = request.getSession(false);
        if (session != null) {
            session.invalidate(); // Remove all attributes and invalidate the session
        }
        
        // Redirect to login page
        response.sendRedirect("login.html");
    }
}
content_copyCOPY