JAVA操作COOKIE

1.实现两个网站www.wangwz.com和post.wangwz.com共用Cookies
2.添加Cookies
    Cookie cookie = new Cookie("name", "wangwz");
    cookie.setPath("/");//这个要设置
    cookie.setDomain(".wangwz.com");//这个也要设置才能实现上面的两个网站共用
    cookie.setMaxAge(365*24*60*60);//不设置的话，则cookies不写入硬盘,而是写在内存,只在当前页面有用,以秒为单位
    response.addCookie(cookie);
    cookie = new Cookie("nick", URLEncoder.encode("王伟宗","UTF-8"));
    cookie.setPath("/");
    cookie.setDomain(".wangwz.com");
    cookie.setMaxAge(365*24*60*60);
    response.addCookie(cookie);
3.获取cookies
    Cookie cookies[] = request.getCookies();
    if (cookies != null)
    {
        for (int i = 0; i < cookies.length; i++)
        {
            if (cookies[i].getName().equals("nick"))
            {
                System.out.println(URLDecoder.decode(cookies[i].getValue(),"UTF-8"));
            }
        }
    }
4.删除cookies
    Cookie cookies[] = request.getCookies();
    if (cookies != null)
    {
        for (int i = 0; i < cookies.length; i++)
        {
            if (cookies[i].getName().equals("nick"))
            {
                Cookie cookie = new Cookie("nick","");//这边得用"",不能用null
                cookie.setPath("/");//设置成跟写入cookies一样的
                cookie.setDomain(".wangwz.com");//设置成跟写入cookies一样的
                response.addCookie(cookie);
            }
        }
    }
注：在网上看到删除是这样做的cookies[i].setMaxAge(0);但我试过，好像不能删除掉cookies