Cookie的应用，高手帮帮忙，好久都没测出来哦，先谢了

<%@page import = "javax.servlet.http.Cookie, java.util.*"%>
<title>cookie应用 </title>
<%
    String userName = "cookitest";
    Cookie[] cookie = request.getCookies();
    Cookie myCookie = null;
    List list = Arrays.asList(cookie);
    Iterator iterator = list.iterator();
   
    while(iterator.hasNext()) {
    Cookie temp = (Cookie)iterator.next();
        if(temp.getName().equals(userName + "access time" )) {
            myCookie = temp;
            break;
        }
    }
    out.println("当前时间为:" + new Date() + "<br>");
    if(myCookie != null) {
        out.println("上次访问的时间:" + myCookie.getValue());
        myCookie.setValue(new Date().toString());
    } else {
            myCookie = new Cookie(userName + " access time", new Date().toString);
    }
    response.addCookie(myCookie);
    response.flushBuffer();
%>