loginfilter.java

分为经理和出纳2个权限

package com.yiboit.cfss.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(true);

		String logonFlag = (String) session.getAttribute("logonFlag");

		String path = request.getServletPath();
		
		if (logonFlag == null) {
			response.sendRedirect(request.getContextPath() + "/index.jsp");
		} else {
			if (path.startsWith("/" + logonFlag)){
				chain.doFilter(req, res);	
			} else {
				response.sendRedirect(request.getContextPath() + "/index.jsp");
			}
		}
	}

	public void init(FilterConfig arg0) throws ServletException {

	}
}