原因：在实际项目中发现 <action /> 的 name 重复时候，Struts2 并不会报错而是随意找一个去执行！

为了避免重复的情况发生，特地写了一个检测的程序：

package barcode;import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;/***创建日期	:2012-10-22*创建用户	:GongQiang*变更情况	:*文档位置 	$Archive:NTT-DATA//ActionNameRepeatCheck.java$*最后变更	$Author:  $*变更日期	$Date: $*当前版本 	$Revision: $**Copyright (c) 2004 Sino-Japanese Engineering Corp, Inc. All Rights Reserved.*/public class ActionNameRepeatCheck {/*** @param args** Date	  :2012-10-22* Author :GongQiang* @throws IOException */public static void main(String[] args) throws IOException {Strut2Xml strut2Xml = new Strut2Xml();strut2Xml.parserXml( "struts.xml" );}}interface XmlDocument { /** * 建立XML文档 *@param fileName 文件全路径名称 */ public void createXml(String fileName);/** * 解析XML文档 * @param fileName 文件全路径名称 */ public void parserXml(String fileName); 
}  class Strut2Xml implements XmlDocument{Document document = null;private Map<String,Integer> map = new HashMap<String,Integer>();/*** 初始化* @param fileName** Date	  :2012-10-22* Author :GongQiang*/private void init( String fileName ){DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db;try {db = dbf.newDocumentBuilder();InputStream in = getClass().getClassLoader().getResourceAsStream(fileName);document = db.parse(in); } catch (ParserConfigurationException e) {e.printStackTrace();} catch (SAXException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} }public void createXml(String fileName) {throw new UnsupportedOperationException( "不支持此操作" );}public void parserXml(String fileName) {init( fileName );// 如果包含<package/> 和 <action/>元素则统计statistics( fileName );// 如果包含<include/> 则统计外部文件的parseInclude(fileName);}/*** 对<package/> 下的 <action/>进行统计* @param fileName** Date	  :2012-10-22* Author :GongQiang*/private void statistics( String fileName ){Element root = document.getDocumentElement();NodeList list = root.getChildNodes();for( int i=0 ; i<list.getLength() ; i++ ){Node node = list.item(i);if( "package".equals(node.getNodeName()) ){String namespace = node.getAttributes().getNamedItem("namespace").getNodeValue();NodeList actions = node.getChildNodes();for( int j=0 ; j<actions.getLength() ; j++ ){Node action = actions.item(j);if( "action".equals( action.getNodeName() ) ){String actionName = action.getAttributes().getNamedItem("name").getNodeValue();Integer count = map.get( namespace + "/" + actionName );if( count == null ){map.put(namespace + "/" + actionName, 1);}else{map.put(namespace + "/" + actionName, ++count);}}}// 打印<package/> 下的统计信息boolean hasRepeat = false;for( String key : map.keySet() ){Integer count = map.get( key );if( count != 1 ){hasRepeat = true;}System.out.println( key + "-->" + count);}if( hasRepeat ){System.out.println( "<package namespace=\""+namespace+"\"/> 包含重复Action！错误！！！\n" );}else{System.out.println( "<package namespace=\""+namespace+"\"/> 不包含重复Action！正确！！！\n" );}}}}/*** 统计外部文件* @param fileName** Date	  :2012-10-22* Author :GongQiang*/private void parseInclude( String fileName ){Element root = document.getDocumentElement();NodeList list = root.getChildNodes();for( int i=0 ; i<list.getLength() ; i++ ){Node node = list.item(i);if( "include".equals(node.getNodeName()) ){String file = node.getAttributes().getNamedItem("file").getNodeValue();new Strut2Xml().parserXml( file );}}}
}