java cookie使用方法-蒲公英云

java cookie使用方法

简介：

java cookie使用方法，封装工具类使用

代码示例：

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * Cookie工具类
 */
public class CookieUtil {
    /**
     * 设置cookie
     *
     * @param maxAge 秒
     */
    public static void setCookie(HttpServletResponse response, String cookieName, String cookieValue, int maxAge) {
        Cookie cookie = new Cookie(cookieName, cookieValue);
        maxAge = Math.max(maxAge, 0);
        cookie.setMaxAge(maxAge);
        cookie.setPath("/");
        response.addCookie(cookie);
    }
    public static void clearCookie(HttpServletResponse response, String cookieName, String domain) {
        Cookie cookie = new Cookie(cookieName, "");
        cookie.setMaxAge(0);
        cookie.setDomain(domain);
        cookie.setPath("/");
        response.addCookie(cookie);
    }
    public static void refreshCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String domain, int maxAge) {
        Cookie cookie = getCookie(request, cookieName);
        if (cookie != null) {
            cookie.setMaxAge(maxAge);
            cookie.setDomain(domain);
            cookie.setPath("/");
            response.addCookie(cookie);
        }
    }
    public static String getCookieValue(HttpServletRequest request, String cookieName) {
        Cookie cookie = getCookie(request, cookieName);
        if (cookie != null) {
            return cookie.getValue();
        }
        return null;
    }
    private static Cookie getCookie(HttpServletRequest request, String cookieName) {
        Cookie[] cookies = request.getCookies();
        if (cookies != null) {
            for (int i = 0; i < cookies.length; i++) {
                if (cookieName.equals(cookies[i].getName())) {
                    return cookies[i];
                }
            }
        }
        return null;
    }
}