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public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest req=(HttpServletRequest)request;
HttpServletResponse res=(HttpServletResponse)response;
if (req.getSession().getAttribute("UserId") != null) {
chain.doFilter(request, response);
}else{
//res.sendRedirect("login.html");
req.getRequestDispatcher("../login.html").forward(req, res);
}
}
<filter>
<display-name>MyFilter</display-name>
<filter-name>MyFilter</filter-name>
<filter-class>org.honf.biz.MyFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>MyFilter</filter-name>
<url-pattern>/jsp/*</url-pattern>
</filter-mapping>