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public class LoginServlet extends HttpServlet { private static final long serialVersionUID = 1L; private final String userID = "test"; private final String password = "test"; protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // get request parameters for userID and password String user = request.getParameter("user"); String pwd = request.getParameter("pwd"); if(userID.equals(user) && password.equals(pwd)){ Cookie loginCookie = new Cookie("user",user); //setting cookie to expiry in 40 mins loginCookie.setMaxAge(40*60); response.addCookie(loginCookie); response.sendRedirect("LoginSuccess.jsp"); } else { RequestDispatcher rd = getServletContext().getRequestDispatcher("/login.html"); PrintWriter out= response.getWriter(); out.println("<font color=red>Either user name or password is wrong.</font>"); rd.include(request, response); } } |
GetCookies
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String userName = null; Cookie[] cookies = request.getCookies(); if(cookies !=null){ for(Cookie cookie : cookies){ if(cookie.getName().equals("user")) userName = cookie.getValue(); } |
Logout Example
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response.setContentType("text/html"); Cookie loginCookie = null; Cookie[] cookies = request.getCookies(); if(cookies != null) { for(Cookie cookie : cookies){ if(cookie.getName().equals("user")){ loginCookie = cookie; break; } } if(loginCookie != null){ loginCookie.setMaxAge(0); response.addCookie(loginCookie); } response.sendRedirect("login.html"); } |