uploadify结合struts2的时候文件取值出错
debug的时候进了action，可是在setUpload方法之前就报错了，错误信息在下面，jsp里面：
<s:form action="/theme/themeManage!insertTheme.action" id="insertThemeForm" method="post" theme="simple" enctype="multipart/form-data">
<input type="file" id="upload" name="upload" />
</s:form>

js里面：

$(function() {



		$("#upload").uploadify({

			'swf' : '../js/uploadify/uploadify.swf',

			'uploader' : '/nbtback/theme/ajaxTheme!insert.action',

			'cancelImg' : '../js/uploadify/uploadify-cancel.png',

			'folder' : 'uploads',

			'queueID' : 'fileQueue',

			'auto' : true,

			'width' : 130,

			'height' : 30,

			'fileObjName' : 'upload',

			'multi' : true,//这里是指定能否上传多个,我改下

			'simUploadLimit' : 2,//一次可以选择多少个文件 

			'buttonText' : '浏览',//按钮文字

			method : 'post',

			onUploadError : function(file, code, msg, errStr) {

				alert(errStr);

			},

			onUploadSuccess : function() {



			}

		});

action里面用来取值的文件相关的三个参数：
private File upload;
private String uploadFileName;// 文件的名称含有后缀
private String uploadContentType;// 文件的类型
get、set方法省略

报的错误如下：Cannot create type class java.io.File from value Submit Query - [unknown location]
at com.opensymphony.xwork2.conversion.impl.XWorkBasicConverter.convertValue(XWorkBasicConverter.java:152)
at com.opensymphony.xwork2.conversion.impl.XWorkBasicConverter.convertValue(XWorkBasicConverter.java:146)
at com.opensymphony.xwork2.conversion.impl.XWorkConverter.convertValue(XWorkConverter.java:334)
at com.opensymphony.xwork2.ognl.OgnlTypeConverterWrapper.convertValue(OgnlTypeConverterWrapper.java:39)
at ognl.OgnlRuntime.getConvertedType(OgnlRuntime.java:1067)
at ognl.OgnlRuntime.getConvertedTypes(OgnlRuntime.java:1084)
at ognl.OgnlRuntime.getConvertedMethodAndArgs(OgnlRuntime.java:1110)
at ognl.OgnlRuntime.getAppropriateMethod(OgnlRuntime.java:1196)
at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1210)
at ognl.OgnlRuntime.setMethodValue(OgnlRuntime.java:1481)
at ognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:85)
at ognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:162)
at com.opensymphony.xwork2.ognl.accessor.ObjectAccessor.setProperty(ObjectAccessor.java:27)
at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:2318)
at com.opensymphony.xwork2.ognl.accessor.CompoundRootAccessor.setProperty(CompoundRootAccessor.java:77)
at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:2318)
at ognl.ASTProperty.setValueBody(ASTProperty.java:127)
at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220)
at ognl.SimpleNode.setValue(SimpleNode.java:301)
at ognl.Ognl.setValue(Ognl.java:737)
at com.opensymphony.xwork2.ognl.OgnlUtil.setValue(OgnlUtil.java:209)
at com.opensymphony.xwork2.ognl.OgnlValueStack.trySetValue(OgnlValueStack.java:173)
at com.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:160)
at com.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:151)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:292)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:203)<