Get cookie value in java

Question

I\'ve initialized cooke like this in my JSP,

String timeStamp = new SimpleDateFormat(\"dd:MM:yyyy_HH:mm:ss:SSS\").format(Calendar.getInstance().getTime());
t         


        

Answer 1

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

    AccountDAO db = new AccountDAO();
    Account ac = (Account) db.getAll(username, password);

    if (ac != null) {
        String remember = request.getParameter("remember");
        if (remember != null) {
            Cookie c_user = new Cookie("username", username);
            Cookie c_pass = new Cookie("password", password);

            c_user.setMaxAge(3600 * 24 * 30);
            c_pass.setMaxAge(3600 * 24 * 30);

            response.addCookie(c_user);
            response.addCookie(c_pass);

            session.setAttribute("display_name", ac.getDisplayName());
            request.getRequestDispatcher("Detail.jsp").forward(request, response);
        } else {
            session.setAttribute("display_name", ac.getDisplayName());
            request.getRequestDispatcher("Detail.jsp").forward(request, response);
        }
    } else {
        request.getRequestDispatcher("login.jsp").forward(request, response);
    }
}

Answer 2

In kotlin it will be much shorter:

fun HttpServletRequest.getCookie( name: String) = cookies.firstOrNull { it.name == name }

Answer 3

protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    String username = "";
    String password = "";
    // Get an array of Cookies associated with this domain
    Cookie[] cookies = request.getCookies();
    if (cookies != null) {
        for (int i = 0; i < cookies.length; i++) {
            if (cookies[i].getName().equals("username")) {
                username = cookies[i].getValue();
            }
            if (cookies[i].getName().equals("password")) {
                password = cookies[i].getValue();
            }
        }
    }
    AccountDAO l = new AccountDAO();
    Account a = l.getAll(username, password);
    if (a != null) {
        request.getRequestDispatcher("Detail.jsp").forward(request, response);
       
    } else {
        request.getRequestDispatcher("login.jsp").forward(request, response);
    }
}

Answer 4

You are using the wrong method for reading the cookies..

Cookie[] cookies = request.getCookies();

if (cookies != null) {
 for (Cookie cookie : cookies) {
   if (cookie.getName().equals("cookieName")) {
     //do something
     //value can be retrieved using #cookie.getValue()
    }
  }
}

use this. No need to detect the cookie for particular user just deactivate it.

Answer 5

Ready to use generic method:

public static Cookie getCookie(HttpServletRequest request, String name) {
    Cookie[] cookies = request.getCookies();
    if (cookies != null) {
        for (Cookie cookie : cookies) {
            if (cookie.getName().equals(name)) {
                return cookie;
            }
        }
    }
    return null;
}

Answer 6

Cookie[] cookies = request.getCookies();
int i = 0;
for (Cookie cookie : cookies ) {

  Sytem.out.println(cookies[i].getName());
  Sytem.out.println(cookies[i].getValue());

  i++;
}