seesion management(new)

PHOTO EMBED

Fri Nov 15 2024 07:21:36 GMT+0000 (Coordinated Universal Time)

Saved by @wtlab 

<!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>
         password: <input type="text" name="pass" required><br><br>
        <input type="submit" value="Login">
    </form>
</body>
</html>
//welcomeservlet.java
package test;

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 javax.servlet.http.HttpSession;

@WebServlet("/WelcomeServlet")
public class WelcomeServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // Retrieve the existing session, if it exists
        HttpSession session = request.getSession(false);
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

        if (session != null) {
            String username = (String) session.getAttribute("username");
            String pass = (String) session.getAttribute("pass");
            if (username != null) {
                out.println("<html><body>");
                out.println("<h2>Welcome, " + username + "!</h2>");
                out.println("<a href='LogoutServlet'>Logout</a>");
                out.println("</body></html>");
            } else {
                response.sendRedirect("login.html"); // Redirect if no username in session
            }
        } else {
            response.sendRedirect("login.html"); // Redirect if no session exists
        }
    }
}
//loginservlet.java
package test;

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 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");
        String pass = request.getParameter("pass");
        

        // Create a new session or retrieve the existing one
        HttpSession session = request.getSession();
        
        // Store the username in the session
        session.setAttribute("username", username);
        session.setAttribute("pass", pass);
        // Respond with the welcome page content
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<html><body>");
        out.println("<h2>Welcome, " + username + "!</h2>");
        out.println("<a href='LogoutServlet'>Logout</a>");
        out.println("</body></html>");
    }
}
//logoutservlet.java
package test;

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 {
        // Get the existing session, if any
        HttpSession session = request.getSession(false);

        if (session != null) {
            // Invalidate the session
            session.invalidate();
        }

        // Redirect to the login page
        response.sendRedirect("login.html");
    }
}
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