Java操作Cookie工具类

   /**
 * 设置cookie有效期，根据需要自定义[本系统设置为30天]
 */
private final static int COOKIE_MAX_AGE = 1000 * 60 * 60 * 24 * 30;

/**
 *
 * @desc 删除指定Cookie
 * @param response
 * @param cookie
 */
public static void removeCookie(HttpServletResponse response, 
                                   Cookie cookie) {
	if (cookie != null) {
		cookie.setPath("/");
		cookie.setValue("");
		cookie.setMaxAge(0);
		response.addCookie(cookie);
	}
}

/**
 *
 * @desc 删除指定Cookie
 * @param response
 * @param cookie
 * @param domain
 */
public static void removeCookie(HttpServletResponse response,
                           Cookie cookie,String domain) {
	if (cookie != null) {
		cookie.setPath("/");
		cookie.setValue("");
		cookie.setMaxAge(0);
		cookie.setDomain(domain);
		response.addCookie(cookie);
	}
}

/**
 *
 * @desc 根据Cookie名称得到Cookie的值，没有返回Null
 * @param request
 * @param name
 * @return
 */
public static String getCookieValue(HttpServletRequest request, 
                                       String name) {
	Cookie cookie = getCookie(request, name);
	if (cookie != null) {
		return cookie.getValue();
	} else {
		return null;
	}
}

/**
 *
 * @desc 根据Cookie名称得到Cookie对象，不存在该对象则返回Null
 * @param request
 * @param name
 */
public static Cookie getCookie(HttpServletRequest request,
                                    String name) {
	Cookie cookies[] = request.getCookies();
	if (cookies == null || name == null || name.length() == 0)
		return null;
	Cookie cookie = null;
	for (int i = 0; i < cookies.length; i++) {
		if (!cookies[i].getName().equals(name))
			continue;
		cookie = cookies[i];
		if (request.getServerName()
		.equals(cookie.getDomain()))
			break;
	}

	return cookie;
}

/**
 *
 * @desc 添加一条新的Cookie信息，默认有效时间为一个月
 * @param response
 * @param name
 * @param value
 */
public static void setCookie(HttpServletResponse response,
                                 String name, String value) {
	setCookie(response, name, value, COOKIE_MAX_AGE);
}

/**
    *
    * @desc 添加一条新的Cookie信息，可以设置其最长有效时间(单位：秒)
    * @param response
    * @param name
    * @param value
    * @param maxAge
    */
   public static void setCookie(HttpServletResponse response,
                             String name, String value, int maxAge)
   {
           if (value == null)
                   value = "";
           Cookie cookie = new Cookie(name, value);
           if(maxAge!=0){
               cookie.setMaxAge(maxAge);
           }else{
               cookie.setMaxAge(COOKIE_MAX_AGE);
           }
           cookie.setPath("/");
           response.addCookie(cookie);
   }