Java Cookie操作工具类

怼烎@ 2023-03-01 10:46 5阅读 0赞

java操作cookie工具类

import javax.servlet.http.Cookie;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /**
     * Cookie工具类
     */
    public class CookieUtil {
    
        private CookieUtil() {
        }
    
        /**
         * 添加cookie
         *
         * @param response HttpServletResponse
         * @param name     cookie名称
         * @param value    cookie值
         * @param maxAge   失效过期时间，以秒为单位
         */
        public static void addCookie(HttpServletResponse response, String name, String value, int maxAge) {
            Cookie cookie = new Cookie(name, value);
            cookie.setPath("/");
            if (maxAge > 0) {
                cookie.setMaxAge(maxAge);
            }
            response.addCookie(cookie);
        }
    
        /**
         * 删除cookie
         *
         * @param response HttpServletResponse
         * @param name     cookie名称
         */
        public static void removeCookie(HttpServletResponse response, String name) {
            Cookie uid = new Cookie(name, null);
            uid.setPath("/");
            uid.setMaxAge(0);
            response.addCookie(uid);
        }
    
        /**
         * 获取cookie值
         *
         * @param request HttpServletRequest
         * @return 返回cookie值，否则返回null
         */
        public static String getUid(HttpServletRequest request, String cookieName) {
            Cookie cookies[] = request.getCookies();
            for (Cookie cookie : cookies) {
                if (cookie.getName().equals(cookieName)) {
                    return cookie.getValue();
                }
            }
            return null;
        }
    }

工具类的调用：

CookieUtil.addCookie(response, "mykey", URLEncoder.encode("hello,你好", "utf-8"), 10 * 365 * 24 * 60 * 60);//设置cookie 10年有效

这里注意cookie时间的设置，cookie的规范是不允许设置永久的

cookie.setMaxAge(0);//不记录cookie
    
    cookie.setMaxAge(-1);//会话级cookie，关闭浏览器失效
    
    cookie.setMaxAge(60*60);//过期时间为1小时