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

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
	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">
	<description>系统过滤器定义</description>
	<filter>
		<filter-name>Set Character Encoding</filter-name>
		<filter-class>com.lhcard.common.SetEncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>gbk</param-value>
		</init-param>
	</filter>
	<filter>
		<filter-name>HibernateSessionFilter</filter-name>
		<filter-class>
			com.lhcard.common.HibernateSessionFilter
		</filter-class>
	</filter>
	<filter>
		<filter-name>FaKaRenLoginFilter</filter-name>
		<filter-class>
			com.lhcard.common.FaKaRenLoginFilter
		</filter-class>
	</filter>
	<filter>
		<filter-name>ShangHuLoginFilter</filter-name>
		<filter-class>
			com.lhcard.common.ShangHuLoginFilter
		</filter-class>
	</filter>
	<filter>
		<filter-name>YunYingLoginFilter</filter-name>
		<filter-class>
			com.lhcard.common.YunYingLoginFilter
		</filter-class>
	</filter>
	<filter>
		<filter-name>ChiKaRenFilter</filter-name>
		<filter-class>
			com.lhcard.common.ChiKaRenFilter
		</filter-class>
	</filter>
	<filter>
		<filter-name>GeRenLoginFilter</filter-name>
		<filter-class>
			com.lhcard.common.GeRenLoginFilter
		</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>Set Character Encoding</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<filter-mapping>
		<filter-name>HibernateSessionFilter</filter-name>
		<url-pattern>*.do</url-pattern>
	</filter-mapping>
	<filter-mapping>
		<filter-name>FaKaRenLoginFilter</filter-name>
		<url-pattern>/FaKaRen/*</url-pattern>
	</filter-mapping>
	<filter-mapping>
		<filter-name>ShangHuLoginFilter</filter-name>
		<url-pattern>/ShangHu/*</url-pattern>
	</filter-mapping>
	<filter-mapping>
		<filter-name>YunYingLoginFilter</filter-name>
		<url-pattern>/YunYing/*</url-pattern>
	</filter-mapping>
	<filter-mapping>
		<filter-name>ChiKaRenFilter</filter-name>
		<url-pattern>/ChiKaRen/*</url-pattern>
	</filter-mapping>
	<filter-mapping>
		<filter-name>GeRenLoginFilter</filter-name>
		<url-pattern>/GeRen/*</url-pattern>
	</filter-mapping>

	<description>STRUTS的ActionServlet配置</description>
	<servlet>
		<servlet-name>action</servlet-name>
		<servlet-class>
			org.apache.struts.action.ActionServlet
		</servlet-class>
		<init-param>
			<param-name>config</param-name>
			<param-value>
				/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
			</param-value>
		</init-param>
		<init-param>
			<param-name>debug</param-name>
			<param-value>3</param-value>
		</init-param>
		<init-param>
			<param-name>detail</param-name>
			<param-value>3</param-value>
		</init-param>
		<load-on-startup>0</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>action</servlet-name>
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>

	<servlet>
		<servlet-name>getalllist</servlet-name>
		<servlet-class>com.lhcard.common.GetAllList</servlet-class>

		<load-on-startup>2</load-on-startup>
	</servlet>

	<!-- FCKeditor  -->
	<servlet>
		<servlet-name>Connector</servlet-name>
		<servlet-class>
			com.fredck.FCKeditor.connector.ConnectorServlet
		</servlet-class>
		<init-param>
			<param-name>baseDir</param-name>
			<param-value>/UserFiles/</param-value>
		</init-param>
		<init-param>
			<param-name>debug</param-name>
			<param-value>true</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>


	<servlet>
		<servlet-name>SimpleUploader</servlet-name>
		<servlet-class>
			com.fredck.FCKeditor.uploader.SimpleUploaderServlet
		</servlet-class>
		<init-param>
			<param-name>baseDir</param-name>
			<param-value>/UserFiles/</param-value>
		</init-param>
		<init-param>
			<param-name>debug</param-name>
			<param-value>true</param-value>
		</init-param>
		<init-param>
			<param-name>enabled</param-name>
			<param-value>true</param-value>
		</init-param>
		<init-param>
			<param-name>AllowedExtensionsFile</param-name>
			<param-value></param-value>
		</init-param>
		<init-param>
			<param-name>DeniedExtensionsFile</param-name>
			<param-value>
				php|php3|php5|phtml|asp|aspx|ascx|jsp|cfm|cfc|pl|bat|exe|dll|reg|cgi
			</param-value>
		</init-param>
		<init-param>
			<param-name>AllowedExtensionsImage</param-name>
			<param-value>jpg|gif|jpeg|png|bmp</param-value>
		</init-param>
		<init-param>
			<param-name>DeniedExtensionsImage</param-name>
			<param-value></param-value>
		</init-param>
		<init-param>
			<param-name>AllowedExtensionsFlash</param-name>
			<param-value>swf|fla</param-value>
		</init-param>
		<init-param>
			<param-name>DeniedExtensionsFlash</param-name>
			<param-value></param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name>Connector</servlet-name>
		<url-pattern>
			/FCKeditor/editor/filemanager/browser/default/connectors/jsp/connector
		</url-pattern>
	</servlet-mapping>

	<servlet-mapping>
		<servlet-name>SimpleUploader</servlet-name>
		<url-pattern>
			/FCKeditor/editor/filemanager/upload/simpleuploader
		</url-pattern>
	</servlet-mapping>


	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
	<description>页面标签的加载</description>
	<jsp-config>
		<taglib>
			<taglib-uri>/WEB-INF/app.tld</taglib-uri>
			<taglib-location>/WEB-INF/app.tld</taglib-location>
		</taglib>
		<taglib>
			<taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
			<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
		</taglib>
		<taglib>
			<taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
			<taglib-location>/WEB-INF/struts-html.tld</taglib-location>
		</taglib>
		<taglib>
			<taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
			<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
		</taglib>
		<taglib>
			<taglib-uri>/WEB-INF/struts-nested.tld</taglib-uri>
			<taglib-location>
				/WEB-INF/struts-nested.tld
			</taglib-location>
		</taglib>
		<taglib>
			<taglib-uri>/WEB-INF/struts-template.tld</taglib-uri>
			<taglib-location>
				/WEB-INF/struts-template.tld
			</taglib-location>
		</taglib>
		<taglib>
			<taglib-uri>/WEB-INF/struts-tiles.tld</taglib-uri>
			<taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
		</taglib>

		<taglib>
			<taglib-uri>/FCKeditor</taglib-uri>
			<taglib-location>/WEB-INF/FCKeditor.tld</taglib-location>
		</taglib>
	</jsp-config>
	<session-config>
		<session-timeout>720</session-timeout>
	</session-config>
</web-app>