loginfilter.java

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package com.briup.web.filter;

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;

import com.briup.dao.bean.Admin;
import com.briup.dao.bean.User;

public class LoginFilter implements Filter {

	public void destroy() {

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse res = (HttpServletResponse) response;
		HttpSession session = req.getSession();
		Admin admin = null;
		User user = null;
		admin = (Admin) session.getAttribute("admin");
		user = (User) session.getAttribute("user");
		if (admin != null || user!=null) {
			chain.doFilter(req, res);			
		} else {
			res.sendRedirect(req.getContextPath() + "/index.jsp");
		}
	}

	public void init(FilterConfig config) throws ServletException {

	}
}