Struts2 保存用户IP到cookie

// 保存用户IP到cookie
	public void setUserIp2Cookie(String cookieName) {
		HttpServletRequest request = ServletActionContext.getRequest();
		String userIp = request.getRemoteAddr();
		if (request.getHeader("x-forwarded-for") != null) {// 当有代理的时候 获取用户真实IP
			userIp = request.getHeader("x-forwarded-for");
			String[] userIps = userIp.split(",");
			for (int i = 0; i < userIps.length; i++) {
				if (!"unknown".equals(userIps[i])) {
					userIp = userIps[i];
					break;
				}
			}
		}
		Cookie cookie = null;
		if (userIp.split(":").length > 1) {
			cookie = new Cookie(cookieName, cookieName);
		} else {
			cookie = new Cookie(cookieName, userIp);
		}
		cookie.setMaxAge(3600 * 24);
		response.addCookie(cookie);
	}