Cookie(一)

一、写cookie

Cookie cookie = new Cookie("key","value");    //新建cookie

cookie.setPath("/");   //设置Cookie路径，不设置的话位当前路径（request.getContextPath()+web.xml中配置的Servlet的url-pattern路径部分）

cookie.setMaxAge(60*60*24*365);   //设置cookie的生存周期全年生效，负值则为在内存在保存，关闭浏览器就失效。设置为0的话，当前cookie被删除，单位为秒

response.addCookie(cookie);   //添加cookie

二、读取cookie

Cookie[] cookies = request.getCookies();

示例：

private static String getJSESSIONID(HttpServletRequest request) {String cookieValue = "";Cookie[] cookies = request.getCookies();if (cookies ！= null) {for (Cookie cookie : cookies) {if (cookie.getName().equalsIgnoreCase("JSESSIONID")) {cookieValue = cookie.getValue();}}return cookieValue;}