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public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
HttpSession session = request.getSession();
UserDTO user = (UserDTO)session.getAttribute("user");
if (user == null) {
response.sendRedirect("login.jsp");
} else {
chain.doFilter(request, response);
}
}
// session expired
if (window != top){
top.location.href = location.href;
}