spring dojo EnhancedGrid 出不来数据，怎么办啊?

12年前

我的jsp如下：

<%@page language="java" isELIgnored="false" contentType="text/html; charset=utf-8" pageEncoding="UTF-8"%>
<html >
<head>
<meta name="decorator" content="none"/>
<link rel="stylesheet" href="${pageContext.request.contextPath}/dojo/dijit/themes/claro/claro.css">
<style type="text/css">@import "${pageContext.request.contextPath}/dojo/dojo/resources/dojo.css";
@import "${pageContext.request.contextPath}/dojo/dijit/themes/claro/claro.css";
@import "${pageContext.request.contextPath}/dojo/dojox/grid/enhanced/resources/claro/EnhancedGrid.css";
@import "${pageContext.request.contextPath}/dojo/dojox/grid/enhanced/resources/EnhancedGrid_rtl.css";

/*Grid need a explicit width/height by default*/
#grid {
     width: 100%;
     height:100%;
}</style>
<script>dojoConfig = {parseOnLoad: true}</script><script src='${pageContext.request.contextPath}/dojo/dojo/dojo.js'></script><script>dojo.require("dojox.grid.EnhancedGrid");
dojo.require("dojox.grid.enhanced.plugins.Pagination");
dojo.require("dojo.data.ItemFileWriteStore");
dojo.require("dojo/store/Memory");
dojo.require("dojo.data.ObjectStore");
dojo.ready(function(){
var dataStore;
      /*set up data store*/
    var data= dojo.xhrGet({
     url:"${pageContext.request.contextPath}/getAllActivity",
     handleAs:"json",
     load: function(data){
      dataStore = new dojo.data.ItemFileReadStore({data: data});
    }
});

    /*set up layout*/
     var layout = [[
       { name: "项目名称", field: "projectName", width: "120px" },
                         { name: "活动内容", field: "activityField", width: "120px" },
                         { name: "计划", field: "specification", width: "150px;" },
                         { name: "活动时间", field: "activityTime", width: "150px" },
                         { name: "活动人", field: "user", width: "120px" },
                         { name: "备注", field: "memo", width: "80px" }
     ]];

    /*create a new grid:*/
     var grid = new dojox.grid.EnhancedGrid({
         id: 'grid',
         store: dataStore,
         structure: layout,
         rowSelector: '20px',
         plugins: {
           pagination: {
               pageSizes: ["25", "50", "100", "All"],
               description: true,
               sizeSwitch: true,
               pageStepper: true,
               gotoButton: true,
                       /*page step to be displayed*/
               maxPageStep: 4,
                       /*position of the pagination bar*/
               position: "bottom"
           }
         }
     }, document.createElement('div'));

/*append the new grid to the div*/
dojo.byId("gridDiv").appendChild(grid.domNode);

    /*Call startup() to render the grid*/
     grid.startup();
});</script>
</head>
<body class="claro">
     <div id="gridDiv"></div>
</body>
</html>

后台的json代码如下：@RequestMapping("/getAllActivity")
@ResponseBody
public Map<String,List>getAllActivity()throws Exception{
   Map<String,List> josnMap = new HashMap<String,List>();
   List<Activity> activities =queryManageService.findAllActivity();
List list=new ArrayList();
for(Activity activity:activities)
{
   Map<String,Object> activityMap=new HashMap<String,Object>();
   activityMap.put("id", activity.getId());
   activityMap.put("activityTime", activity.getActivityTime());
   activityMap.put("activityField", activity.getActivityField());
   if(activity.getProject()!=null){
   activityMap.put("projectName", activity.getProject().getProjectName());
   }else{
    activityMap.put("projectName","");
   }
   if(activity.getTask()!=null){
   activityMap.put("specification",activity.getTask().getSpecification());
   }else{
    activityMap.put("specification","");
   }
   activityMap.put("user", activity.getUserByCreater().getCname());
   activityMap.put("memo", activity.getMemo());
   list.add(activityMap);
}
josnMap.put("activities",list);
return josnMap;
}