Struts2 无法导向到首页

接触Struts2不是很久，想尝试用一下，就在web.xml
welcome-file下设计直接跳转到指定的action

There is no Action mapped for namespace / and action name

直接输action没有问题，配置没有问题

查了一些资料，原来问题出现在

 <welcome-file-list>
  <welcome-file>login.do</welcome-file>
  </welcome-file-list> 

tomcat 会去检查有没有在相应的目录下有没有login.do这个文件.
解决方法一：在对应的目录下建立对应的文件 之后再跳转都随你了（测试不带后缀的不可以）

解决方法二：（因上面的解决方法 只在Tomcat服务器下适用，别的不一定适用）
创建一个Filter 过滤访问地址，通用

package com.lc.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;

import org.apache.commons.lang.StringUtils;

public class WelcomeFileFilter implements Filter {
    public void destroy() {
        indexFile = null;
    }

    private String indexFile;

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
            ServletException {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        
        String servletPath = httpServletRequest.getServletPath();
        
        String contextPath = httpServletRequest.getContextPath();
        String requestURI = httpServletRequest.getRequestURI();
        
        System.out.println(requestURI);
        
        if (contextPath.equalsIgnoreCase(requestURI) || (contextPath + "/").equalsIgnoreCase(requestURI)) {
            String url = "";
            if (indexFile.startsWith("/")) {
                url = contextPath + indexFile;
            } else {
                url = contextPath + "/" + indexFile;
            }
            httpServletResponse.sendRedirect(url);
        } else {
            chain.doFilter(request, response);
        }
    }

    public void init(FilterConfig arg0) throws ServletException {
        indexFile = "login";
        String x = arg0.getInitParameter("indexFile");
        if (StringUtils.isNotBlank(x)) {
            indexFile = x;
        }
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	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_2_5.xsd">
	
	<filter>
		<filter-name>welcome</filter-name>
		<filter-class>com.lc.common.WelcomeFileFilter</filter-class>
	</filter>
	
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
	
	<filter-mapping>
		<filter-name>welcome</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
  <welcome-file-list>
    <welcome-file>login.....</welcome-file>
  </welcome-file-list>
</web-app>

这样处理的话  welcome-file-list 对应的file 写什么都无所谓

这里关联到Filter（过滤器） 再学习一下
http://guifan.iteye.com/blog/1631513

参考页面：
http://blog.ziki.cn/284.html
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