java cookie

If set to a negative value, it is a browser process cookie (saved in memory), which will become invalid when the browser is closed.

If set to 0, the cookie will be deleted.

public static void delCookie(HttpServletRequest request,HttpServletResponse response,String name) {
        Cookie cookie = getCookieByName(request, name);
        if(cookie != null) {
            cookie.setMaxAge(0);
            cookie.setPath("/");
            response.addCookie(cookie);
        }
    }
    
    /**
     * set cookie
     * @param response
     * @param name
     * @param value
     * @param maxAge
     */
    public static void addCookie(HttpServletResponse response,String name,String value,int maxAge){
        Cookie cookie = new Cookie(name,value);
        cookie.setPath("/");
        if(maxAge>0)  cookie.setMaxAge(maxAge);
        response.addCookie(cookie);
    }
    
    public static Cookie getCookieByName(HttpServletRequest request,String name){
        Map<String,Cookie> cookieMap = ReadCookieMap(request);
        if(cookieMap.containsKey(name)){
            Cookie cookie = (Cookie)cookieMap.get(name);
            return cookie;
        }else{
            return null;
        }   
    }
     
    private static Map<String,Cookie> ReadCookieMap(HttpServletRequest request){  
        Map<String,Cookie> cookieMap = new HashMap<String,Cookie>();
        Cookie[] cookies = request.getCookies();
        if(null!=cookies){
            for(Cookie cookie : cookies){
                cookieMap.put(cookie.getName(), cookie);
            }
        }
        return cookieMap;
    }