src/com/meeting/filter/CheckSessionFilter.java

微信扫码关注公众号，代码整理好后第一时间通知你。

package com.meeting.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 com.meeting.bean.Employee;

public class CheckSessionFilter implements Filter{

	@Override
	public void destroy() {
	}

	@Override
	public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
			throws IOException, ServletException {
		// TODO Auto-generated method stub
		HttpServletRequest request=(HttpServletRequest)req;
		HttpServletResponse response=(HttpServletResponse)resp;

		//如果session中的用户信息失效，则跳转到login.jsp
		Employee employee = (Employee) request.getSession().getAttribute("EmployeeSession");
		String url = request.getRequestURI();
		System.out.println("---------"+url);
		if(url.endsWith("login.jsp") || url.endsWith("CheckLoginFilter")) {
			System.out.println("Sessionlogin");
			chain.doFilter(request, response);
			return;
		}else {
		if(employee == null ) {
			System.out.println("login----------------------");
			response.sendRedirect("login.jsp");
		}else{
			chain.doFilter(request, response);
		}
	}
	}
	@Override
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		
	}

}