package filters;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class LoginFilter implements Filter{

    public void init(FilterConfig conf) throws ServletException{ 
       
        }
    }
    
    public void doFilter(ServletRequest req,ServletResponse res,
    FilterChain chain) throws ServletException,IOException{
        HttpServletRequest hReq = (HttpServletRequest)req;
        HttpServletResponse   hres=(HttpServletResponse)res; 
        HttpSession s = hReq.getSession(true);
        Object ac = (Object) s.getAttribute("account");
        
        if(ac==null){
            ((HttpServletResponse)res).sendRedirect("/user/loginForm");
            ／／是在这里加吗？改如何写请教下
        }
        chain.doFilter(req,res);
        
        
        }
    public void destroy(){ 
     // TODO Auto-generated method stub

    }

  
    }