treepanel动态加载数据的例子

var tree = new Ext.tree.TreePanel({
        region:'west',
        title:'站点树：',
        width:200,
        minSize:150,
        maxSize:200,
        iconCls:'ux-auth-menu-header-icon',
        split:true,
        autoScroll:true,
        autoHeight:false,
        collapsible:true,
        rootVisable:false, //不显示根节点
        root:new Ext.tree.TreeNode({
            id:'root',
            text:'分所',
            draggable:false,
            expanded:true
        }),
        loader:new Ext.tree.TreeLoader({
            dataUrl:'treeUtil.html?content.method=getAllMenuTreeNodes'
        })
    });

public void getAllMenuTreeNodes(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
String systemId = request.getParameter("node");
String haveCheckBox = request.getParameter("haveCheckBox");
IMenuManager menuManager = this.getPkgServer().getDriver().getSystemManageServer().getMenuManager();
List<HashMap> nodes = new ArrayList<HashMap>();
String parentNodeName =menuManager.getMenu(Long.parseLong(systemId)).getName() ;
List<Menu> menus = menuManager.getMenus("em.parent_name= '" +parentNodeName + "'");
for(Menu menu:menus){
HashMap<String, Object> hm=new HashMap<String, Object>();
hm.put("id", menu.getId());
hm.put("text", menu.getTitle());

hm.put("iconCls",menu.getName());
nodes.add(hm);
}
JSONArray ary = new JSONArray(nodes);
writeJson(response, ary.toString());

}

补充：web前端 , JavaScript ,