Java实现对cookie的操作(增删改查)详解编程语言

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; 
	}