Redirecting back to actual page what they were viewing before login

by

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

String from = request.getRequestURI();

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

response.sendRedirect("login.jsp?from=" + URLEncoder.encode(from, "UTF-8"));

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)}" />

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

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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