我用ext的FileUploadField是FileUploadField显示不出来不知道什么问题

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
   
    <title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">   
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<link rel="stylesheet" type="text/css" href="ext/resources/css/ext-all.css">

<script type="text/javascript" src="ext/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="ext/ext-all.js"></script>
<script type="text/javascript" src="js/TreeFormPanel.js"></script>
<script type="text/javascript" src="js/Tool.js"></script>
<script type="text/javascript" src="js/FileUploadField.js"></script>
<script type="text/javascript">
Ext.onReady(function(){
Ext.BLANK_IMAGE_URL="/Ext-FileUpload/ext/locale/s.gif";
  Ext.QuickTips.init();

var fp = new Ext.FormPanel({
        renderTo:Ext.getBody(),
        fileUpload: true,
        width: 500,
        frame: true,
        title: 'File Upload Form',
        autoHeight: true,
        bodyStyle: 'padding: 10px 10px 0 10px;',
        labelWidth: 50,
        defaults: {
            anchor: '95%',
            allowBlank: false,
            msgTarget: 'side'
        },
        items: [{
            xtype: 'textfield',
            fieldLabel: 'Name'
        },{
            xtype:'fileuploadfield',
            id: 'form-file',
            emptyText: 'Select an image',
            fieldLabel: 'Photo',
            name:'photo-path',
            buttonText: '',
            buttonCfg: {
                iconCls: 'upload-icon'
            }
        }],
        buttons: [{
            text: 'Save',
            handler: function(){
                if(fp.getForm().isValid()){
                fp.getForm().submit({
                    url: '',
                    waitMsg: 'Uploading your photo...',
                    success: function(fp, o){
                        msg('Success', 'Processed file "'+o.result.file+'" on the server');
                    }
                });
                }
            }
        },{
            text: 'Reset',
            handler: function(){
                fp.getForm().reset();
            }
        }]
    });

});
</script>
  </head>
 
  <body>
  
  </body>
</html>
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