sessionfilter

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletRequest req = (HttpServletRequest)request;
HttpServletResponse res = (HttpServletResponse)response;
HttpSession session = req.getSession();
try{
request.setCharacterEncoding("utf-8");
//String url = req.getRequestURI();
//System.out.println(url);

if(session.getAttribute("adminuser")!=null&&!session.getAttribute("adminuser").equals("")){

chain.doFilter(request, response);

}else{
res.sendRedirect("../index.html");
//request.getRequestDispatcher("../../index.jsp").forward(request,response);
}
}catch(Exception e){
e.printStackTrace();
}
}