EXT中在前台使用ajax将后台model类封装为json格式传到前台，并且解析出model中属性

后台：

//得到报修人数据
public String getBaoxiuInfo(){
HttpServletRequest request = getHttpServletRequest();
WarrantyService workorder = new WarrantyService();
String ws_num = request.getParameter("re_num");
workorder.setWs_num(ws_num);   //设置编号
JSONArray jsonArray = new JSONArray();
JSONObject jsonData = new JSONObject();
jsonArray.add(JsonUtil.beanToJson(getiWarrantyServiceService().selectBaoxiuInfo(workorder))); //将得到的model类转为Json，放入json数组中
jsonData.put("BaoxiuInfo",jsonArray);     //jsonData中数据格式：{"BaoxiuInfo": [{"ws_num":"abcd"}]}
printHttpServletResponse(jsonData.toString());

return null;
}

前台：

Ext.Ajax.request({
url: 'warrantyServiceAction!getBaoxiuInfo.shtml',
method: 'POST',
params: {re_num:recordtoedit.get("re_num")},
success: function(response) {
var jsonObj = Ext.util.JSON.decode(response.responseText);

alert(jsonObj.BaoxiuInfo[0].ws_num);  //结果为abcd

}
});