使用过滤器验证是否登录

以前过滤器可能都只是处理下编码，这次项目中发觉其他成员都是使用过滤器来验证是否登录，然后作相应的转向，发觉真的很不错，不用写一个页面用来判断，然后在每个页面进行包含，也不需要在action中先判断是否登录了再作相应的业务逻辑处理。。。看来还是项目经验不够啊。。。
过滤器

package com.lhcard.common;

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;

/**
 * @author:陈伟
 * @date:2008-5-23
 * 
 */
public class GeRenLoginFilter implements Filter {

	private final static String[] eixt_url = { "index.jsp", "userlogin.jsp",
			"relogin.jsp", "uholdcard.do", "/js", "/css", "/images",
			"cgoods.do", "keywordslist.jsp", "regprotocol.jsp", "register.jsp",
			"uarea.do" }; // 不用做权限判断的URL

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

		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse res = (HttpServletResponse) response;
		boolean haveFind = true;

		// System.out.println("req.getRequestURI()==="+req.getRequestURI());

		if (req.getRequestURI().indexOf(".jsp") >= 0
				|| req.getRequestURI().indexOf(".do") >= 0)
			haveFind = false;

		for (int i = 0; i < eixt_url.length; i++) {
			if (req.getRequestURI().indexOf(eixt_url[i]) >= 0) {
				haveFind = true;
				break;
			}
		}

		// System.out.println("haveFind==="+haveFind);

		if (!haveFind && req.getSession().getAttribute("user") == null) {
			res.sendRedirect(req.getContextPath() + "/GeRen/relogin.jsp");
			// System.out.println("----redirect----");
			return;
		}
		chain.doFilter(req, res);
	}

	public void init(FilterConfig filterConfig) throws ServletException {
	}

	public void destroy() {
	}

}

web.xml下的配置

	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	系统过滤器定义
	
		Set Character Encoding
		com.lhcard.common.SetEncodingFilter
		
			encoding
			gbk
		
	
	
		HibernateSessionFilter
		
			com.lhcard.common.HibernateSessionFilter
		
	
	
		FaKaRenLoginFilter
		
			com.lhcard.common.FaKaRenLoginFilter
		
	
	
		ShangHuLoginFilter
		
			com.lhcard.common.ShangHuLoginFilter
		
	
	
		YunYingLoginFilter
		
			com.lhcard.common.YunYingLoginFilter
		
	
	
		ChiKaRenFilter
		
			com.lhcard.common.ChiKaRenFilter
		
	
	
		GeRenLoginFilter
		
			com.lhcard.common.GeRenLoginFilter
		
	
	
		Set Character Encoding
		/*
	
	
		HibernateSessionFilter
		*.do
	
	
		FaKaRenLoginFilter
		/FaKaRen/*
	
	
		ShangHuLoginFilter
		/ShangHu/*
	
	
		YunYingLoginFilter
		/YunYing/*
	
	
		ChiKaRenFilter
		/ChiKaRen/*
	
	
		GeRenLoginFilter
		/GeRen/*
	

	STRUTS的ActionServlet配置
	
		action
		
			org.apache.struts.action.ActionServlet
		
		
			config
			
				/WEB-INF/struts-config.xml,
				/WEB-INF/struts-config-chikaren.xml,
				/WEB-INF/struts-config-geren.xml,
				/WEB-INF/struts-config-shanghu.xml,
				/WEB-INF/struts-config-yunying.xml,
				/WEB-INF/struts-config-fakaren.xml
			
		
		
			debug
			3
		
		
			detail
			3
		
		0
	
	
		action
		*.do
	

	
		getalllist
		com.lhcard.common.GetAllList

		2
	

	
	
		Connector
		
			com.fredck.FCKeditor.connector.ConnectorServlet
		
		
			baseDir
			/UserFiles/
		
		
			debug
			true
		
		1
	


	
		SimpleUploader
		
			com.fredck.FCKeditor.uploader.SimpleUploaderServlet
		
		
			baseDir
			/UserFiles/
		
		
			debug
			true
		
		
			enabled
			true
		
		
			AllowedExtensionsFile
			
		
		
			DeniedExtensionsFile
			
				php|php3|php5|phtml|asp|aspx|ascx|jsp|cfm|cfc|pl|bat|exe|dll|reg|cgi
			
		
		
			AllowedExtensionsImage
			jpg|gif|jpeg|png|bmp
		
		
			DeniedExtensionsImage
			
		
		
			AllowedExtensionsFlash
			swf|fla
		
		
			DeniedExtensionsFlash
			
		
		1
	

	
		Connector
		
			/FCKeditor/editor/filemanager/browser/default/connectors/jsp/connector
		
	

	
		SimpleUploader
		
			/FCKeditor/editor/filemanager/upload/simpleuploader
		
	


	
		index.jsp
	
	页面标签的加载
	
		
			/WEB-INF/app.tld
			/WEB-INF/app.tld
		
		
			/WEB-INF/struts-bean.tld
			/WEB-INF/struts-bean.tld
		
		
			/WEB-INF/struts-html.tld
			/WEB-INF/struts-html.tld
		
		
			/WEB-INF/struts-logic.tld
			/WEB-INF/struts-logic.tld
		
		
			/WEB-INF/struts-nested.tld
			
				/WEB-INF/struts-nested.tld
			
		
		
			/WEB-INF/struts-template.tld
			
				/WEB-INF/struts-template.tld
			
		
		
			/WEB-INF/struts-tiles.tld
			/WEB-INF/struts-tiles.tld
		

		
			/FCKeditor
			/WEB-INF/FCKeditor.tld
		
	
	
		720