处理一个 form 多个 submit的问题

我照着Struts2教程做了一个处理一个 form 多个 submit的demo
struts.xml:

<!DOCTYPE struts PUBLIC 

 "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" 

 "http://struts.apache.org/dtds/struts-2.0.dtd"> 

<struts> 

	<package name="HelloWorld" extends="struts-default"> 

		<action name="HelloWorld" class="com.hengrensoft.study.HelloWorldAction"> 

			<result>/HelloWorld.jsp</result> 

		</action>

		<action name="Sum" class="com.hengrensoft.study.SumAction"> 

			<result name="positive">/positive.jsp</result>

			<result name="negative">/negative.jsp</result>

		</action> 

		<action name="MultiSubmit" class="com.hengrensoft.study.MultiSubmitAction"> 

		 	<result name="save">/SubmitResult.jsp</result>

		 	<result name="print">/SubmitResult.jsp</result>

		 </action>

		<!-- Add your actions here --> 

	</package> 

</struts>

MultiSubmit.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%> 

<%@ taglib prefix="s" uri="/struts-tags" %> 

<html> 

 <head> 

 <title>My JSP 'hello.jsp' starting page</title> 

 </head> 

 <body> 

 <s:form action="MultiSubmit" > 

 <s:textfield name="msg" label="输入内容"/> 

 <s:submit name="save" value="保存" align="left" method="save"/> 

 <s:submit name="print" value="打印" align="left" method="print" /> 

 </s:form> 

 </body> 

</html>

MultiSubmitAction.java

package com.hengrensoft.study;



import javax.servlet.http.HttpServletRequest;



import org.apache.struts2.interceptor.ServletRequestAware;



import com.opensymphony.xwork2.ActionSupport;



public class MultiSubmitAction extends ActionSupport implements ServletRequestAware

{



	/**

	 * 

	 */

	private static final long serialVersionUID = 1L;

	

	private HttpServletRequest request;

	private String msg;



	public String getMsg() 

	{

		return msg;

	}

	public void setMsg(String msg) 

	{

		this.msg = msg;

	}

	

	public String save()

	{

		System.out.println("exe saving...");

		request.setAttribute("result", "成功保存[" + msg + "]"); 

		 return "save";

	}

	

	public String print()

	{

		System.out.println("exe print...");

		request.setAttribute("result", "成功打印[" + msg + "]"); 

		 return "print";

	}

	

	public String execute()

	{

		System.out.println("execute...");

		return NONE;

	}

	

	

	@Override

	public void setServletRequest(HttpServletRequest request) 

	{

		this.request = request;

	}

	

}

结果在MultiSubmit.jsp那里点击保存，执行的是execute那里，没有去save执行，我用的是struts-2.5.20，请教大家，这是什么原因造成的？