Hackforge Academy

Explanation

HTTP is stateless, so session management is required when an application needs to remember information about a user across multiple requests.

Code:

Request 1 → Login
Request 2 → Dashboard
Request 3 → Profile

Session keeps user information available across requests.

Explanation

A cookie is a small piece of data stored by the browser and sent back to the server with subsequent requests.

Code:

Cookie cookie = new Cookie("username", "Praveen");
response.addCookie(cookie);

Explanation

Read cookies from an incoming request using getCookies().

Code:

Cookie[] cookies = request.getCookies();

if (cookies != null) {
    for (Cookie cookie : cookies) {
        System.out.println(cookie.getName());
    }
}

Explanation

HttpSession stores server-side information associated with a particular user session.

Code:

HttpSession session = request.getSession();
session.setAttribute("username", "Praveen");

Explanation

Retrieve and remove session attributes using getAttribute() and removeAttribute().

Code:

String username =
    (String) session.getAttribute("username");

session.removeAttribute("username");