struts上传文件出错！

问？：

弄了一个struts上传文件的程序，可是程序死活不执行ActionForm中的setFile()方法，以至在Action中得到的file值为空，请执教!原程序如下：
1、uploadFile.jsp:

<%@taglib uri="/WEB-INF/struts-tiles.tld" prefix="tiles"%>
<%@taglib uri="/WEB-INF/struts-nested.tld" prefix="nested"%>
<%@taglib uri="/WEB-INF/struts-logic.tld" prefix="logic"%>
<%@taglib uri="/WEB-INF/struts-template.tld" prefix="template"%>
<%@taglib uri="/WEB-INF/struts-bean.tld" prefix="bean"%>
<%@taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>
<%@page contentType="text/html; charset=UTF-8"%>
<html:html>
<body>
<html:form action="/UploadFileAction.do" method="post">
上传文件：<html:file property="myFile"/>

<html:submit />
</html:form>
</body>
</html:html>

2、UploadFileForm.java:

import org.apache.struts.action.*;

import org.apache.struts.upload.*;

import javax.servlet.http.*;

public class UploadFileForm extends ActionForm{

private FormFile myFile;

public UploadFileForm(){}

public FormFile getMyFile(){

return this.myFile;

}

public void setMyFile(FormFile myFile){

System.out.println("Form is running");//这句没有执行

this.myFile=myFile;

}
}
3、配置文件：
<struts-config>
<data-sources />
<form-beans>
<form-bean name="UploadFileForm" type="hello.form.UploadFileForm"/>
</form-beans>
<global-exceptions />
<global-forwards />
<action-mappings>
<action path="/UploadFileAction"
type="hello.action.UploadFileAction"
name="UploadFileForm"
input="/uploadFile.jsp"
>
<forward name="success" path="/ok.jsp"></forward>
</action>
</action-mappings>
<message-resources parameter="com.yourcompany.struts.ApplicationResources" />
</struts-config>

答！： 1:

< html:form action="/UploadFileAction.do" method="post" enctype="multipart/form-data" >

struts上传文件出错！

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