大神们帮我看看是什么问呢，弄了好久了！框架是SpringMvc+hiberbate;
情况如图：
如果我单独访问这个页面的话它却能显示出来：
主页代码：
侧面代码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import ="java.util.*,com.springmvc.bean.Menu"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<!-- <title>Java动态树形菜单</title> -->
<link rel="stylesheet" href="/SpringMVC/css/demo.css" type="text/css">
<link rel="stylesheet" href="/SpringMVC/css/zTreeStyle/zTreeStyle.css" type="text/css">
<script type="text/javascript" src="/SpringMVC/js/jquery-1.4.4.min.js"></script>
<script type="text/javascript" src="/SpringMVC/js/jquery.ztree.core-3.0.js"></script>
<!-- <script type="text/javascript" src="/MenuDemo/js/jquery.ztree.excheck-3.0.js"></script>
<script type="text/javascript" src="/MenuDemo/js/jquery.ztree.exedit-3.0.js"></script>-->
<SCRIPT type="text/javascript">
var setting = {
view: {
dblClickExpand: false,
showLine: false
},
data: {
simpleData: {
enable: true
}
},
callback: {
onClick: onClick
}
};
var zNodes =[
<%
List menuList=(List)request.getAttribute("menuList");
for(int i=0;i<menuList.size();i++){
Menu menu=(Menu)menuList.get(i);
if(i!=menuList.size()-1){%>
{ id:<%=menu.getId()%>, pId:<%=menu.getpId()%>, name:"<%=menu.getName()%>", rootPId:<%=menu.getRootPId()%> ,url:"<%=menu.getUrl()%>" },
<%
}else{%>
{ id:<%=menu.getId()%>, pId:<%=menu.getpId()%>, name:"<%=menu.getName()%>", rootPId:<%=menu.getRootPId()%> ,url:"<%=menu.getUrl()%>" }
<%
}
}
%>
];
function onClick(e,treeId, treeNode) {
var zTree = $.fn.zTree.getZTreeObj("treeDemo");
zTree.expandNode(treeNode);
}
$(document).ready(function(){
$.fn.zTree.init($("#treeDemo"), setting, zNodes);
});
</SCRIPT>
<style type="text/css">
.ztree li button.switch {visibility:hidden; width:1px;}
.ztree li button.switch.roots_docu {visibility:visible; width:16px;}
.ztree li button.switch.center_docu {visibility:visible; width:16px;}
.ztree li button.switch.bottom_docu {visibility:visible; width:16px;}
</style>
</head>
<body>
<div class="content_wrap" style="width: 234px;heigh:800px">
<div class="zTreeDemoBackground left">
<ul id="treeDemo" class="ztree"></ul>
</div>
</div>
</body>
</html>
