用户登录之后才能进入主页,用户注销后就不能进入主页了
1.用户登录之后,向Ssession中放入用户的数据
2.进入主页的时候要判断用户是否登录,要求:在过滤器中实现
//HttpServletRequest ServletRequest
HttpServletRequest request = (HttpServletRequest) servletRequest;
HttpServletResponse response = (HttpServletResponse) servletResponse;
Object user_session = request.getSession().getAttribute("USER_SESSION");
if (user_session == null) {
response.sendRedirect("/javaweb_filter_war_exploded/Login.jsp");
}
filterChain.doFilter(servletRequest,servletResponse);
}