CookieUtil工具类--根据名称返回cookie、根据名称返回value、新增cookie、删除cookie

深藏阁楼爱情的钟 2022-12-10 14:42 120阅读 0赞

package com.jt.util;
    
    import javax.servlet.http.Cookie;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
     /**
         * 该工具API主要的任务
         *      1.根据cookie的名称 返回cookie对象
         *      2.根据cookie的名称 返回valve的值
         *      3.新增cookie方法
         *      4.删除cookie方法
         */
    public class CookieUtil {
    
       
        
        /**
         * 
         * @param cookieName   需要匹配的cookie名
         * @param request   request对象
         * @return  返回一个cookie对象
         */
        public static Cookie getCookie(String cookieName, HttpServletRequest request){
            Cookie[] cookies = request.getCookies();
            if(cookies !=null && cookies.length >0) {
                for (Cookie cookie : cookies) {
                    if (cookieName.equals(cookie.getName())) {
                        return cookie;
                    }
                }
            }
            return null ;
        }
        
        /**
         * 
         * @param cookieName    需要匹配的cookie名
         * @param request    request对象
         * @return    返回cookie的值
         */
        public static String getCookieValue(String cookieName,HttpServletRequest request){
            Cookie cookie = getCookie(cookieName, request);
            return cookie ==null?null:cookie.getValue();
        }
        
        /**
         * 
         * @param cookieName   需要匹配的cookie名
         * @param cookieValue   设置的cookie值
         * @param path   设置路径下的能访问cookie
         * @param domain   设置作用域名能访问到cookie
         * @param maxAge  设置存活时间
         * @param response   响应信息
         */
        public static void addCookie(String cookieName, String cookieValue, String path,
                                     String domain, int maxAge, HttpServletResponse response){
            Cookie cookie = new Cookie(cookieName,cookieValue);
            cookie.setPath(path);
            cookie.setDomain(domain);
            cookie.setMaxAge(maxAge);
            response.addCookie(cookie);
        }
        
        /**
         * 
         * @param cookieName    需要匹配的cookie名
         * @param path  
         * @param domain
         * @param response
         */
    
        public static void deleteCookie(String cookieName,String path,
                                        String domain,HttpServletResponse response){
    
            addCookie(cookieName,"",path, domain, 0, response);
        }
    
    }