Ext gridpanel的使用

Ext.onReady(function (){
var myData = [['11','test',13],
['12','test2',23]
];
var colModel = new Ext.grid.ColumnModel([
{header: "编号", dataIndex: 'id',sortable:true}
//{header: "姓名",  dataIndex: 'name'},
//{header: "年龄",  dataIndex: 'age'}
]);
//var store1 = new Ext.data.Store({
//   proxy : new Ext.data.HttpProxy({url:'/test!test.action'}),
//   reader: new Ext.data.JsonReader({
//        root: 'user',
//      totalProperty: 'totalCount',
//       fields:['id','name','age']
//	})
//	proxy: new Ext.data.MemoryProxy(myData),
//	 reader: new Ext.data.ArrayReader({}, [
//       {name: 'id'},
//      {name: 'name'},
//     {name: 'age',type:'int'}
//])

//  });

var store1 = new Ext.data.JsonStore({
url:"/test!test.action",
root:"user",
totalProperty:"totalCount",
fields:[{name:"id"}]
});

var grid=new Ext.grid.GridPanel({
renderTo:Ext.getBody(),
store:store1,
autoHeight:true,
width:150,
cm:colModel
});
grid.render();
store1.load();
});

public ActionForward test() {
StringBuffer text = new StringBuffer();
text.append("{totalCount:10,user:[{id:11}]}");
String info = text.toString();
// HttpServletRequest request=ServletActionContext.getRequest();
// request.setAttribute("info", info);
HttpServletResponse response = ServletActionContext.getResponse();
response.setCharacterEncoding("UTF-8");
try {
response.getWriter().print(info);
response.getWriter().flush();
} catch (Exception e) {
e.printStackTrace();
}

return null;
}