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        String username = request.getParameter("username");
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        String password = request.getParameter("password");
        //ÉèÖÃCookie
        Cookie userCookie = null;
        Cookie passCookie = null;
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            userCookie = new Cookie("username", username);
            passCookie = new Cookie("password", password);
            userCookie.setMaxAge(20);
            passCookie.setMaxAge(20);
            response.addCookie(userCookie);
            response.addCookie(passCookie);
            response.sendRedirect("../success.jsp");
        }
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     String username = new String();
        String password = new String();
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        Cookie[] cookies = request.getCookies();
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