1、创建

Cookie cookie = new Cookie("username", "my name") ;
cookie.setMaxAge(60 * 60 * 24);  // 有效时间，单位 s
response.addCookie(cookie); // 发送cookie 至客户端

2、读取

Cookie cookies[] = request().getCookies();
Cookie cookie = null;
if(cookies != null){
	for(int i = 0; i < cookies.length; i++){
		cookie = cookies[i];
		out.println(cookie.getName());
		out.println(cookie.getValue());
	}
	
}

3、删除

Cookie cookies[] = request().getCookies();
Cookie cookie = null;
for(int i = 0; i < cookies.length; i++){
	cookie = cookies[i];
	if(cookie.getName().equals("password")){
			cookie.setMaxAge(0); // 让该cookie过期 即可删除
			response.addCookie(cookie) ;
		}
}