securityfilter.java

电子商城

package com.lmh.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.lmh.dao.vo.UserBean;

public class SecurityFilter implements Filter {

	public void destroy() {

	}

	public void doFilter(ServletRequest req, ServletResponse res,
			FilterChain chain) throws IOException, ServletException {

		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) res;

		HttpSession session = request.getSession();

		UserBean user = (UserBean) session.getAttribute("userBean");
		if (user != null) {
			chain.doFilter(request, response);
		} else {
			response.sendRedirect("/lmhshop/font/login.jsp");
		}

	}

	public void init(FilterConfig arg0) throws ServletException {

	}

}