servlet清除本地存储

Question

How the servlet can clear localStorage? I try the following code, but it does not clear the localStorage data. When user logout account, it will direct to logout.java servlet, destroy session object and clear localStorage:

    / ... /
    request.logout();
    request.getSession().invalidate();
    request.getSession().removeAttribute("student");
    response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
    response.setHeader("Pragma", "no-cache"); // HTTP 1.0.
    response.setDateHeader("Expires", 0); // Proxies.
    out.println("<script type=\"text/javascript\">");
    out.println("localStorage.clear();");
    out.println("</script>");
    response.sendRedirect("index.html");
    /..../

Is there any error?

Answer 1

you are calling response.sendRedirect() which sends to the browser an HTTP 302 response code and a Location HTTP header. Your browser is almost certainly ignoring any message body written to the response, so your script will not be executed.

Answer 2

The part of your code that you are closing tag

out.println("</javascript>");

Is the issue. You have opened <script> so that close it </script> .