Struts和Extjs整合问题

新手出道！学习了SSH 和 Extjs，但在整合的问题一直弄不明白
各种Extjs配置项让人头晕
我在浏览器载入网页的时候，后台服务的execute()被调用,并且输出了
********访问前********
********访问后********
但是我前台看不到数据id,name,和password

求高手解惑：麻烦指出原因后！并能直接给出修改后的代码谢谢！！！！！
求高手解惑：麻烦指出原因后！并能直接给出修改后的代码谢谢！！！！！
求高手解惑：麻烦指出原因后！并能直接给出修改后的代码谢谢！！！！！

不胜感激！

Action类：
public class ExtjsAction extends ActionSupport{

private int id;
private String name;
private String password;

public String execute() throws Exception {
System.out.println("********访问前********");//检测extjs前端的函数不是不访问改action
this.id = 5;
this.name = "chenwei";
this.password = "123456";
System.out.println("********访问后********");//检测extjs前端的函数不是不访问改action
return "success";
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

}

struts配置：
<struts>
  <package name="default" namespace="/" extends="json-default">
  <action name="json" class="com.extjs.action.ExtjsAction">
  <result type="json" name="success">
  <param name="includeProperties">id，name,password</param>

  </result>
  </action>
  </package>
</struts>

Ext代码：
Ext.onReady(function(){

var user = Ext.data.Record.create([
  {name:"id",mapping:"id"},
  {name:"username",mapping:"name"},
  {name:"password",mapping:"password"}
  ]);
  //存储器
var vstore = new Ext.data.JsonStore({
autoDestory:true,
url:'json.action',
reader:new Ext.data.JsonReader({
root:"allUser",
id:"id",
totalProperty:"recordSize"
},user)
});

vstore.load();
  var grid = new Ext.grid.GridPanel({
  title:"administrator",
  store:vstore,
  columns:[
  {header:"ID", dataIndex:"id",width:20},
  {header:"username", dataIndex:"name",width:100},
  {header:"password", dataIndex:"password",width:100}
  ]

  });
  new Ext.Viewport({
  layout:"border",
  items:[{
  title:"AdminArea",
  region:"north",
  height:100
  },{
  region:"west",
  title:"Function",
  width:150,
  split:true

  },{
  region:"center",
  title:"MainArea",
  id:"mainContent",
  items:grid
  }]
  });
});

补充：我用firebug调试发现浏览器能够获得数据

{"id":5,"name":"chenwei","password":"123456"} 这是firebug捕获的数据 --------------------编程问答-------------------- reader: new Ext.data.JsonReader({
root:"allUser",
id:"id",
totalProperty:"recordSize"
},[
{name: 'id'},
{name: 'name'},
{name: 'password'}
])
});

补充：Java ,  Web 开发