treepanel动态加载数据实现代码

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()); 
}