实验室设备管理系统

package cn.itcast.LabManagement;

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;

public class LoginFilter implements Filter {

	public void doFilter（ServletRequest request ServletResponse response
			FilterChain chain） throws IOException ServletException {

		HttpServletRequest req = （HttpServletRequest） request;
		object user = req.getSession（）.getAttribute（“sessionUser“）;
		if（user == null） {
			req.setAttribute（“msg“ “请登录系统！“）;
			req.getRequestDispatcher（“/adminjsps/msg.jsp“）.forward（req response）;
		} else {
			chain.doFilter（request response）;
		}
	}

	public void init（FilterConfig fConfig） throws ServletException {

	}

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