java - How to clear browser cache using java

Question

I have a problem in sessions. When ever I logout the session is ended but then when the browsers back button is pressed I am getting the previous page. I am using jsp servlet technology and my code for logout is given below

                    request.getSession().invalidate();
        response.setHeader("Cache-Control","no-cache"); 
        response.setDateHeader("Expires", 0);
        response.setHeader("Pragma","no-cache"); 
        response.sendRedirect("home.jsp");

can anybody tell me where is the problem and what will be the solution for this problem?

Answer 1

您是否仅在注销页面上设置缓存标头？如果是这样，您需要将它们放在每个页面上，因为您来自的页面没有它们并且将被缓存。

Answer 2

写下你的代码，

     //...
     response.setHeader("Cache-Control","no-cache"); //Forces caches to obtain a new copy of the page from the origin server
     response.setHeader("Cache-Control","no-store"); //Directs caches not to store the page under any circumstance
     response.setDateHeader("Expires", 0); //Causes the proxy cache to see the page as "stale"
     response.setHeader("Pragma","no-cache"); //HTTP 1.0 backward compatibility

     //can check userId or something likes this.In this sample, i checked with userName.
     String userName = (String) session.getAttribute("User");
     if (null == userName) {
         request.setAttribute("Error", "Session has ended.  Please login.");
         RequestDispatcher rd = request.getRequestDispatcher("login.jsp");
         rd.forward(request, response);
    }

Answer 3

<script>
    history.forward();
 </script>

将此javascript添加到该注销页面之前的页面并调用。在标签上添加以下代码

onLoad="if (location.href.indexOf('reload')==-1) location.replace(location.href+'?reload')"

它将解决您的后退按钮问题。