loginfilter.java

基于JAVA新闻发部系统

package com.myfilter;

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 arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException {
		// TODO Auto-generated method stub
		HttpServletRequest request=(HttpServletRequest)arg0;
		HttpSession session=request.getSession();
		if(session==null || session.getAttribute("isLogin")==null || session.getAttribute("isLogin").toString().equals("false"))
		{
			HttpServletResponse response=(HttpServletResponse)arg1;
			response.sendRedirect("qmain.jsp");
		}
		else
		{
			arg2.doFilter(arg0, arg1);
		}
	}

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

}