仅在刷新页面后加载Cookie | 仅在刷新页面后加载Cookie

本文介绍了仅在刷新页面后加载Cookie的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我真的很抱歉，这是关于Cookie的第二个或第三个问题，但老实说，我不明白为什么会发生这种情况...

在登录页面上，我通过以下方式设置Cookie:

I''m truly sorry, this is the second or third question about cookies, but honestly I can''t understand why this happens...

On the login page I set the cookie this way:

Cookie cookie = new Cookie("username", user);
cookie.setMaxAge(365 * 24 * 60 * 60);
response.addCookie(cookie);

然后将用户重定向到其他页面.

除了以下内容，我删除了几乎所有代码(以确保没有冲突):

And then user is redirected to a different page.

I deleted almost all my code (to make sure there are no conflicts), except this:

<%@page import="javax.servlet.http.Cookie"%>

<html>

<%
	Cookie cookies[] = request.getCookies();
	Cookie nome = null;
	Cookie aux_login = null;
	int auxiliar = 0;
	Cookie idaux = null;
	String jog1="",jog2="";

	if (cookies != null) {
		for (int i = 0; i < cookies.length; i++) {
			out.println("<br>"+cookies[i].getName()+" <br>");
			if (cookies[i].getName().equals("username")) {
				nome = cookies[i];
			}
			if (cookies[i].getName().equals("aux_login")) {
				aux_login = cookies[i];
			}

			if (cookies[i].getName().equals("idsala")) {
				idaux = cookies[i];
			}

		}
	}
	out.println("ARE NULL ??");

	if (nome == null) {
		out.println("Cookie ''username'' nao encontrada");
        else
         welcome nome.getValue()...



	}

因此，在第一次加载时未找到Cookie(已验证nome == null)，但是如果刷新页面，便会找到它们-因此它们存在，但在第一次加载时它们未被检测到...

我究竟做错了什么?考虑一下这件事，如果页面相同，那将是正常的(当然会显示信息)，但是页面却是不同的...

So at the first load cookies are not found (that nome == null is verified), but if I refresh the page they are found - so they exist, but in a first load they are not being detected...

What am I doing wrong? Thinking about the matter this would be normal (the information displayed of course) if the page was the same, but it''s a different page...

推荐答案

if (nome == null) {
    out.println("Cookie 'username' nao encontrada");
    and with js script..
    window.location.reload();

我被重定向到index.jsp.多数民众赞成在我登录成功(并转到default.jsp)时发现我的URL仍然是(出于某种动机！)index.jsp.
看起来像是因为这样进行重定向:

I was redirectedto index.jsp. Thats when I noticed when I do a sucessfull login (and go to default.jsp) my URL is still (for some motive!!) index.jsp.
Looks like its because doing the redirect this way:

<jsp:forward page="/default.jsp" />
<%

使用response.sendRedirect("default.jsp");
解决的问题
请注意，上一页的request.getParameter("t1")将不再起作用.

附注:使用会话进行身份验证总是更安全.

Problem solved with response.sendRedirect("default.jsp");

Be advised that request.getParameter("t1") from previous page will not work anymore.

P.S: It''s always safer use sessions for authentication.

这篇关于仅在刷新页面后加载Cookie的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！