ajax请求提交到controller后总是不成功

    @RequestMapping("select.do")
    @ResponseBody
    // 加入ResponseBody,才有返回值,ajax请求才能成功
    public String selectByDate(HttpServletRequest request, Model model) {
        String begin_Date = request.getParameter("begin_Date");
        List<MobileManage> list = getDataList(begin_Date);
        JSONArray json = JSONArray.fromObject(list);
        String paseJson = paseJson(list);
        // System.out.println(json.toString());
        return paseJson;
    }

$.ajax({
                       type:"post",
                       url:"/mylog/mobileManage/select.do",
                       dataType:"json",
                       data:{begin_Date:begin_Date},
                       success:function(data){
                                        //处理
                                    }    
})