javaEE cookie保存中文时报错

做练习的时候老是出错：
The server encountered an internal error that prevented it from fulfilling this request.

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源码如下：

for (int index = 0; index < cookies.length; index++) {                  if(cookies[index].getName().equals("lastAccessDate")) {                    lastAccessDate =cookies[index].getValue();                    nowAccessDate = (nowDate.getYear() + 1900) + "年" + (nowDate.getMonth() + 1) + "月"                            + nowDate.getDate() + "日" + nowDate.getHours() + "时" + nowDate.getMinutes() + "分"                            + nowDate.getSeconds() + "秒";                    oneCookie = new Cookie("lastAccessDate", nowAccessDate);                    oneCookie.setMaxAge(24 * 60 * 60);                        response.addCookie(oneCookie);                    break;

错误发生在：response.addCookie(oneCookie);

原来是编码格式不正确，cookie不能保存中文，把上面句子中的 年 月日 时分秒 改成英文就不会报错了

若是一定要保存为中文，则把中文转化为UTF-8字符串就可以保存了：

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保存的时候用java.net.URLEncoder.encode(String,”UTF-8”)编码

取回来的时候用java.net.URLDecoder.decode(String,”UTF-8”)解码

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全部源码如下：
“`
<%@page import=”org.apache.naming.java.javaURLContextFactory”%>
<%@page import=”java.util.Date”%>
<%@ page pageEncoding=”UTF-8”%>


cookie


<%!String lastAccessDate = null;
String nowAccessDate = null;
Cookie oneCookie = null;
Cookie[] cookies = null;
Date nowDate = null;%>

<%    cookies = request.getCookies();    nowDate = new Date();    if (cookies == null) {        lastAccessDate = (nowDate.getYear() + 1900) + "年" + (nowDate.getMonth() + 1) + "月" + nowDate.getDate()                + "日" + nowDate.getHours() + "时" + nowDate.getMinutes() + "分" + nowDate.getSeconds() + "秒";        lastAccessDate = java.net.URLEncoder.encode(lastAccessDate,"UTF-8");  //编码        oneCookie = new Cookie("lastAccessDate", lastAccessDate);        oneCookie.setMaxAge(24 * 60 * 60);        response.addCookie(oneCookie);        out.println("cookie:" + oneCookie.toString());    } else {        for (int index = 0; index < cookies.length; index++) {            if (cookies[index].getName().equals("lastAccessDate")) {                lastAccessDate = cookies[index].getValue();                lastAccessDate = java.net.URLDecoder.decode(lastAccessDate,"UTF-8");  //解码                nowAccessDate = (nowDate.getYear() + 1900) + "年" + (nowDate.getMonth() + 1) + "月"                        + nowDate.getDate() + "日" + nowDate.getHours() + "时" + nowDate.getMinutes() + "分"                nowAccessDate = java.net.URLEncoder.encode(nowAccessDate,"UTF-8");  //编码                oneCookie = new Cookie("lastAccessDate", nowAccessDate);                oneCookie.setMaxAge(24 * 60 * 60);                    response.addCookie(oneCookie);                break;            }        }    }           out.print("您上次访问本系统的时间是在:" + lastAccessDate);%>