java操作cookie

public static void addCookie(HttpServletResponse response,String domain,String name,String value,int maxAge){
        try {
            //解决中文报Control character in cookie value, consider BASE64 encoding your value错。
            value=URLEncoder.encode(value,"UTF-8");
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        Cookie cookie = new Cookie(name,value);
        cookie.setPath("/");
     if(!domain.equals("")&&domain!=null){
            cookie.setDomain(domain);
     }else {
            cookie.setDomain("."+SystemConfig.getInstance().getDnsName());
        }
     if(maxAge>0) cookie.setMaxAge(maxAge);
        response.addCookie(cookie);
    }
    public static String getCookieValue(String cook, HttpServletRequest request) {
        Cookie[] cookies = request.getCookies();
        try {
            for (Cookie one : cookies) {
                if (one.getName() != null && one.getName().equals(cook))
                    return URLDecoder.decode(one.getValue(),"UTF-8");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    public static void clearCookiebyName(String cook, HttpServletRequest request,HttpServletResponse response){
        Cookie[] cookies = request.getCookies();
        if (cookies != null) {
            for (Cookie one : cookies) {
                try {
                    if (one.getName() != null && one.getName().equals(cook)){
                        one.setMaxAge(0);
                        one.setDomain("." + SystemConfig.getInstance().getDnsName());
                        response.addCookie(one);
                    }
                } catch (Exception e) {

                    BitTools.debugPrintln("清楚Cookies发生异常！");
                }
            }
        }

    }
    public static void clearAllCookie(HttpServletRequest request,HttpServletResponse response){
        Cookie[] cookies = request.getCookies();
        Cookie cookie = null;
        if (cookies != null) {
            for (int i = 0; i < cookies.length; i++) {
                try {
                    cookie = cookies[i];
                    cookie.setMaxAge(0);
                    cookies[i].setDomain("." + SystemConfig.getInstance().getDnsName());
                    response.addCookie(cookie);
                } catch (Exception e) {

                    BitTools.debugPrintln("清空Cookies发生异常！");
                }
            }
        }
    }