session过期返回登录页面跳出frame

session 过期返回登录页面

方法1，

HttpSession session = request.getSession();

      String LOGIN_ID = (String) session.getAttribute("LOGIN_ID");

      if (null == LOGIN_ID||"".equals(LOGIN_ID)) {

          java.io.PrintWriter out = response.getWriter();

          out.println("<html>");

          out.println("<script>");

   out.println("window.open ('"+request.getContextPath()+"/login.jsp','_top')");

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

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

           return;

方法2.

在login.jsp中加入

 <script>

        if(window.top!==window.self){window.top.location=window.location};

 </script>