CookieUtil工具類--根據名稱傳回cookie、根據名稱傳回value、新增cookie、删除cookie

package com.jt.util;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

 /**
     * 該工具API主要的任務
     *      1.根據cookie的名稱 傳回cookie對象
     *      2.根據cookie的名稱 傳回valve的值
     *      3.新增cookie方法
     *      4.删除cookie方法
     */
public class CookieUtil {

   
    
    /**
     * 
     * @param cookieName   需要比對的cookie名
     * @param request   request對象
     * @return  傳回一個cookie對象
     */
    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    需要比對的cookie名
     * @param request    request對象
     * @return    傳回cookie的值
     */
    public static String getCookieValue(String cookieName,HttpServletRequest request){
        Cookie cookie = getCookie(cookieName, request);
        return cookie ==null?null:cookie.getValue();
    }
    
    /**
     * 
     * @param cookieName   需要比對的cookie名
     * @param cookieValue   設定的cookie值
     * @param path   設定路徑下的能通路cookie
     * @param domain   設定作用域名能通路到cookie
     * @param maxAge  設定存活時間
     * @param response   響應資訊
     */
    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    需要比對的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);
    }

}