ajaxFileUpload上传附件

前端代码
var url= '<%=path%>/analyzeAssetExcel';
url=url+'?siteId='+siteId;
$.ajaxFileUpload({
        url:url,
        secureuri:false, 
        fileElementId:'assetupload',
        dataType:'text',
        success: function (data, status){
        data=$.parseJSON(data);
        if(data.result){
        $("#impuuid").val(data.uuid);
        $("#taskfrmlist").submit();
        }else{
        alert("数据异常，请检查后重试！");
        }
        },
        error: function (data, status){
           alert("上传失败，请重试！");
        }
});

后台代码
@RequestMapping(value = "/analyzeAssetExcel")
    public String analyzeAssetExcel(@RequestParam(value = "upload") MultipartFile upload, String siteId, HttpServletRequest request, HttpServletResponse response) throws IOException {
        boolean result = false;
        String uuid = UUID.randomUUID().toString().replaceAll("-", "");
        /*******上传附件操作*****/
        uuid = result ? uuid : "";
        String json = "{\"result\":" + result + ",\"uuid\":\"" + uuid + "\"}";
        ajaxOutPutHtml(response, json);
        return null;
    }

public void ajaxOutPutHtml(HttpServletResponse response,Object obj) throws IOException{
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        out.println(obj);
    }