将他们在登录前查看的内容重定向回实际页面 [英] Redirecting back to actual page what they were viewing before login

问题描述

如果我的用户被重定向到登录页面，如何使他们在登录后被重定向到 -original- 目标页面(他们第一次点击的页面)?

If my user is redirected to a login page, how to make it so that, after they log in, they get redirected to the -original- destination page (the one they first clicked on)?

推荐答案

在重定向到登录页面时，将最初请求的 URL 作为请求参数传递.

Pass the originally requested URL as request parameter on the redirect to the login page.

String from = URLEncoder.encode(request.getRequestURI(), "UTF-8");

if (request.getQueryString() != null) {
    from += "?" + request.getQueryString();
}

response.sendRedirect("login.jsp?from=" + from);

在login.jsp中，将其作为隐藏输入字段传递给登录表单提交目标.

In login.jsp, pass it to the login form submit target as a hidden input field.

<input type="hidden" name="from" value="${fn:escapeXml(param.from)}" />

(注意:fn:escapeXml() 可防止您在 HTML 中重新显示用户控制的数据时遭受 XSS)

(note: fn:escapeXml() prevents you from XSS when redisplaying user-controlled data in HTML)

在登录动作中，检查是否存在，然后进行相应处理.

In the login action, check if it is there and then handle accordingly.

String from = request.getParameter("from");

if (from != null && !from.isEmpty()) {
    response.sendRedirect(from);
} else {
    response.sendRedirect("home.jsp");
}

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