ext FormPanel中得到后台数据问题

求助大侠们帮忙，十分感激不尽：  
我用struts+spring+hibernate+ext js 做项目时，从列表中点一列时，跳到编辑页面时，无法显示出原先列表的数据。
代码如下：
Ext.onReady(function(){
    Ext.QuickTips.init();    // turn on validation errors beside the field globally
    Ext.form.Field.prototype.msgTarget = 'side';
    var bd = Ext.getBody();
    //增加数据源
    var store = new Ext.data.Store({
        remoteSort: true,
        sortInfo: {field: 'feedBackTime', direction: 'DESC'},        proxy: new Ext.data.HttpProxy({
            url: 'feedBackAction!feedBackEdit.do',method:'POST'
        }),        reader: new Ext.data.JsonReader({
            root: 'results',
            idProperty: 'feedBackId',
            fields: [
                'userAccount', 'enterpriseAccount', 'feedBackTime', 'feedBackContent'
            ],
            listeners :{   
                        load:function(){   
                            Ext.getCmp('userAccount').setValue('userAccount');
                            Ext.getCmp('enterpriseAccount').setValue('enterpriseAccount');
                            Ext.getCmp('feedBackTime').setValue('feedBackTime');
                            Ext.getCmp('feedBackContent').setValue('feedBackContent');   
                        }   
                    }  
            
        })
    });    var top = new Ext.FormPanel({
        labelAlign: 'top',
        frame:true,
        width:'810',
        height:'12',
        renderTo: 'feed_back',
        bodyStyle:'padding:5px 5px 0',
        items: [{
            layout:'column',
            items:[{
                columnWidth:0.5,
                layout: 'form',
                items: [{
                    xtype:'textfield',
                    fieldLabel: '用户账号',
                    name: 'userAccount',
                    valueField:'userAccount',
                    editable:false,
                    anchor:'95%'
                }, {
                    xtype:'textfield',
                    fieldLabel: '反馈时间',
                    name: 'feedBackTime',
                    valueField:'feedBackTime',
                    anchor:'95%'
                }]
            },{
                columnWidth:.5,
                layout: 'form',
                items: [{
                    xtype:'textfield',
                    fieldLabel: '企业账号',
                    name: 'enterpriseAccount',
                    valueField:'enterpriseAccount',
                    anchor:'95%'
                }]
            }]
        },{
            xtype:'textarea',
            name:'feedBackContent',
            fieldLabel:'反馈信息',
            valueField:'feedBackContent',
            height:200,
            anchor:'98%'
        }],

        buttons: [{
            text: 'Save'
        },{
            text: 'Cancel'
        }]
    });    top.render(document.body);});