java操作cookie
基于SpringMVC框架写的:
/** * 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; }