web.xml 同时配置Struts2与Servlet的解决方法
* 该类是定义了一个过滤器（随便你放在摸个包下面），当既用到struts2有用到servlet时，
* 必须用该过滤器对所有的servlet做一次过滤，否则servlet将无法正常运行。
* 同时在web.xml中，在定义struts的核心控制器前面添加该过滤器，添加代码如下：
* <filter>
* <filter-name>redisp</filter-name>
* <filter-class>filters.ReDispatcherFilter（该过滤器的类名）</filter-class>
* <init-param>
* <param-name>includeServlets</param-name>
* <param-value>所配置的servlet，注意是那url-pattern</param-value>
* </init-param>
* </filter>
* <filter-mapping>
* <filter-name>redisp</filter-name>
* <url-pattern>/*</url-pattern>
* </filter-mapping>
* @author xsl
*
*/
ReDispatcherFilter的完整代码为:
package zy.page.demo.servletconf;import java.io.IOException;import java.util.ArrayList;import java.util.Arrays;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;public class ReDispatcherFilter implements Filter {public void destroy() {// TODO Auto-generated method stub}public void doFilter(ServletRequest req, ServletResponse resp,FilterChain chain) throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) req;String target = request.getRequestURI();target = target.lastIndexOf("?") > 0 ? target.substring(target.lastIndexOf("/") + 1, target.lastIndexOf("?")- target.lastIndexOf("/")) : target.substring(target.lastIndexOf("/") + 1);System.out.println(target);if (this.includes.contains(target)) {RequestDispatcher rdsp = request.getRequestDispatcher(target);System.out.println("go..............." + rdsp);rdsp.forward(req, resp);} elsechain.doFilter(req, resp);}private ArrayList<String> includes = new ArrayList<String>();public void init(FilterConfig config) throws ServletException {this.includes.addAll(Arrays.asList(config.getInitParameter("includeServlets").split(",")));}}<?xml version="1.0" encoding="UTF-8"?><web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"><welcome-file-list><welcome-file>./page/showpage.jsp</welcome-file></welcome-file-list><filter><filter-name>redisp</filter-name><filter-class>zy.page.demo.servletconf.ReDispatcherFilter</filter-class><init-param><param-name>includeServlets</param-name><param-value>downexcel</param-value></init-param></filter><filter-mapping><filter-name>redisp</filter-name><url-pattern>/*</url-pattern></filter-mapping><servlet><description>This is the description of my J2EE component</description><display-name>This is the display name of my J2EE component</display-name><servlet-name>downexcel</servlet-name><servlet-class>zy.demo.test.DownExcel</servlet-class></servlet><servlet-mapping><servlet-name>downexcel</servlet-name><url-pattern>/downexcel</url-pattern></servlet-mapping><filter><filter-name>struts2</filter-name><filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class></filter><!-- 让Struts 2的核心Filter拦截所有请求 --><filter-mapping><filter-name>struts2</filter-name><url-pattern>/*</url-pattern></filter-mapping><!--<servlet> <servlet-name>Readxml</servlet-name><servlet-class>zy.demo.utils.Readxml</servlet-class><load-on-startup>1</load-on-startup> </servlet>--></web-app>