import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * Cookie.Util
 */
public class CookieUtil {
       // 預設快取時間,單位/秒, 2H
private static final int COOKIE_MAX_AGE = 60 * 60 * 2;
// 儲存路徑,根路徑
private static final String COOKIE_PATH 
 
= "/";
/**
        * 儲存
        *
        * @param response
* @param key
* @param value
* @param ifRemember 
*/
public static void set(HttpServletResponse response, String key, String value, boolean ifRemember) {
              int age = ifRemember?COOKIE_MAX_AGE:-1;
set(response, key, value, null, COOKIE_PATH
 
, age, true);
}
       /**
        * 儲存
        * @param response
* @param key
* @param value
* @param maxAge
*/
private static void set(HttpServletResponse response, String key, String value, String domain, String path, int maxAge, boolean isHttpOnly) {
              Cookie cookie = new Cookie(key, value);
 
              if (domain != null) {
                     cookie.setDomain(domain);
}
              cookie.setPath(path);
cookie.setMaxAge(maxAge);
cookie.setHttpOnly(isHttpOnly);
response.addCookie(cookie);
}
       
       /**
        * 查詢value
        * @param request
* @param key
* @return
*/
public static String getValue(HttpServletRequest request, String key) {
              Cookie cookie = get(request, key);
              if (cookie != null) {
                     return cookie.getValue();
}
              return null;
}

       /**
        * 查詢Cookie
        *
        * @param request
* @param key
*/
private static Cookie get(HttpServletRequest request, String key) {
              Cookie[] arr_cookie = request.getCookies();
              if (arr_cookie != null && arr_cookie.length > 0) {
                     for (Cookie cookie : arr_cookie) {
                            if (cookie.getName().equals(key)) {
                                   return cookie;
}
                     }
              }
              return null;
}
       
       /**
        * 刪除Cookie
        *
        * @param request
* @param response
* @param key
*/
public static void remove(HttpServletRequest request, HttpServletResponse response, String key) {
              Cookie cookie = get(request, key);
              if (cookie != null) {
                     set(response, key, "", null, COOKIE_PATH, 0, true);
}
       }

}