loginfilter.java

通讯录

package cn.com.txl.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;

public class LoginFilter implements Filter {

	public void destroy() {
		// TODO Auto-generated method stub

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		HttpServletRequest hreq = (HttpServletRequest)request;
        HttpServletResponse hres = (HttpServletResponse)response;
        HttpSession session = hreq.getSession();
        String isLogin="";
        try
        {
        	isLogin=(String)session.getAttribute("login");        
            if(isLogin!=null&&isLogin.equals("true")){
           	 chain.doFilter(hreq,hres);
            }else{
           	 hres.sendRedirect("/TongXunLu/index.jsp");
            }
		 }
        catch(Exception e)
        {         
        	e.printStackTrace();
        }
	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub

	}

}