loginfilter.java

一个bbs论坛系统

package com.lovo.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;

public class LoginFilter 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();
		
		Boolean isLog = (Boolean)session.getAttribute("isLogSur");
		
		if(isLog == null) {
			session.setAttribute("errorInfo", "请您先登录或者注册");
			response.sendRedirect("../error.jsp");
			return;
		} else {
			chain.doFilter(request, response);
		}
		
	}

	public void init(FilterConfig arg0) throws ServletException {
		
	}

}