authfilter.java

一个十分出色的网上商城啊

package com.bjsxt.shopping.util.filter;

import java.io.IOException;
import java.io.PrintWriter;

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 AuthFilter implements Filter {

	public void destroy() {
		System.out.println("authfilter destroy");
	}

	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		//System.out.println("authfilter dofilter");
		HttpServletRequest request = (HttpServletRequest)req;
		HttpServletResponse response = (HttpServletResponse)resp;
		HttpSession session = request.getSession(false);
		
		if(session == null || (String)session.getAttribute("admin") == null ||!((String)session.getAttribute("admin")).equals("admin")) {
			System.out.println(request.getContextPath());
			response.sendRedirect( request.getContextPath() + "/AdminLogin.jsp");
			return;
		}
		chain.doFilter(req, resp);
	}

	public void init(FilterConfig config) throws ServletException {
		System.out.println("authfilter init");
	}

}