loginfilter.java

新闻发布系统

package com.mynews;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
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 {
		HttpServletRequest request = (HttpServletRequest) arg0;
		HttpServletResponse response = (HttpServletResponse) arg1;

		HttpSession session = request.getSession();
		String str = session.getId().toString();
		if(session==null || session.getAttribute("access")==null || session.getAttribute("access").toString().equals("false"))
		{
		//	System.out.print("请先登录");
			RequestDispatcher dis = request.getRequestDispatcher("login.html");
			dis.forward(arg0, arg1);
		}
		else
		{
			arg2.doFilter(arg0, arg1);
		}

	}

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

	}

}