onlinefilter.java

j2ee,struts2 hibernate spring2.5的电影系统简单的

package com.movie.util;

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.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class OnlineFilter extends HttpServlet implements Filter {

	private static final long serialVersionUID = 1L;

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws ServletException, IOException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse res = (HttpServletResponse) response;
		HttpSession session = req.getSession();

		if (session.getAttribute("user") == null) {
			System.out.println("user has logged in.");
			res.sendRedirect("../admin_login.jsp");
			return;
		} else {
			chain.doFilter(request, response);
		}

	}

	public void init(FilterConfig filterConfig) {
		System.out.println("OnlineFilter initialized.");
	}

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

}