基于springMVC框架下写的    

/**     * 读取所有cookie     * 注意二、从客户端读取Cookie时，包括maxAge在内的其他属性都是不可读的，也不会被提交。浏览器提交Cookie时只会提交name与value属性。maxAge属性只被浏览器用来判断Cookie是否过期     * @param request     * @param response     */    @RequestMapping("/showCookies")    public void showCookies(HttpServletRequest request,HttpServletResponse response ){          Cookie[] cookies = request.getCookies();//这样便可以获取一个cookie数组     if (null==cookies) {      System.out.println("没有cookie=========");     } else {      for(Cookie cookie : cookies){          System.out.println("name:"+cookie.getName()+",value:"+ cookie.getValue());      }     }         }    /**     * 添加cookie     * @param response     * @param name     * @param value     */    @RequestMapping("/addCookie")    public void addCookie(HttpServletResponse response,String name,String value){     Cookie cookie = new Cookie(name.trim(), value.trim());     cookie.setMaxAge(30 * 60);// 设置为30min     cookie.setPath("/");     System.out.println("已添加===============");     response.addCookie(cookie);    }    /**     * 修改cookie     * @param request     * @param response     * @param name     * @param value     * 注意一、修改、删除Cookie时，新建的Cookie除value、maxAge之外的所有属性，例如name、path、domain等，都要与原Cookie完全一样。否则，浏览器将视为两个不同的Cookie不予覆盖，导致修改、删除失败。     */    @RequestMapping("/editCookie")    public void editCookie(HttpServletRequest request,HttpServletResponse response,String name,String value){     Cookie[] cookies = request.getCookies();     if (null==cookies) {      System.out.println("没有cookie==============");     } else {      for(Cookie cookie : cookies){       if(cookie.getName().equals(name)){        System.out.println("原值为:"+cookie.getValue());        cookie.setValue(value);        cookie.setPath("/");        cookie.setMaxAge(30 * 60);// 设置为30min        System.out.println("被修改的cookie名字为:"+cookie.getName()+",新值为:"+cookie.getValue());        response.addCookie(cookie);        break;       }      }     }         }    /**     * 删除cookie     * @param request     * @param response     * @param name     */    @RequestMapping("/delCookie")    public void delCookie(HttpServletRequest request,HttpServletResponse response,String name){     Cookie[] cookies = request.getCookies();     if (null==cookies) {      System.out.println("没有cookie==============");     } else {      for(Cookie cookie : cookies){       if(cookie.getName().equals(name)){        cookie.setValue(null);        cookie.setMaxAge(0);// 立即销毁cookie        cookie.setPath("/");        System.out.println("被删除的cookie名字为:"+cookie.getName());        response.addCookie(cookie);        break;       }      }     }    }

通常开发时先用以下的代码将获取的cookie进行封装    

/**    * 根据名字获取cookie    * @param request    * @param name cookie名字    * @return    */   public  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;       }      }               /**    * 将cookie封装到Map里面    * @param request    * @return    */   private  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;   }