使用webuploader插件做导入功能，但是每导入一个文件，控制器就进入两次，不懂原因，求教各位大神，谢谢！

前台代码：

/**
 * 导入工具类
 * Created by huangli on 2017/08/10
 */
define(function (require, exports, module) {
    var defaultOptions = {
        swf: staticWebUrl + '/lib/webuploader/v0.1.5/Uploader.swf',
        auto : true,    //自动上传
       // auto : false, //用户控制上传时机
        fileVal : "file",
        fileNumLimit : 1,
        duplicate : false,
        server : webRoot + "import/imStClinic",
        //按钮
        pick : {
            //按钮ID
            id : "#importBtn",
            //按钮文字
            innerHTML : "导入",
            //按钮是否支持多选，默认不支持
            multiple : false
        },
        //允许的文件格式
        accept : {
            title : "Excel",
            extensions : "xlsx,xls",
            mimeTypes : "application/xls,application/xlsx"
        }
    };
    var internal = {
        init : function(options){
            var uploadOptions = $.extend(true, {}, defaultOptions, options);
            var uploader = WebUploader.create(uploadOptions);

            //添加文件错误
            uploader.on( 'error', function(type, file) {
                if (type == "Q_EXCEED_NUM_LIMIT") {
                    //该错误的file为undefined
                    type = "文件数量超出限制,最多" + uploader.options.fileNumLimit + "个！";
                } else if (type == "Q_EXCEED_SIZE_LIMIT") {
                    type =  "文件大小超出限制！";
                } else if (type == "Q_TYPE_DENIED") {
                    type = "文件类型错误！请选择" + uploader.options.accept[0].extensions;
                } else if (type == "F_DUPLICATE") {
                    type =  "文件重复！";
                } else if (type == "Q_FILE_CANNOT_BE_EMPTY") {
                    type =  "文件内容不能为空！";
                }
                common.jsmsgError(type);
            });

            // 文件上传失败
            uploader.on( 'uploadError', function(file , response) {
                //common.jsmsgError("导入失败，错误编码：" + response + "！");
                common.jsmsgError("导入失败！");
            });

            //当所有文件上传结束时触发
            uploader.on('uploadFinished',function(file, response){
                uploader.reset();
            });

            // 文件上传成功，给item添加成功class, 用样式标记上传成功。
            uploader.on( 'uploadSuccess', function( file , response) {
                //导入不需要写

            });
            //上传返回值
            uploader.on("uploadAccept", function(file, response){
                //错误信息在这里提示
                if (response.isSuccess) {
                    common.jsmsgSuccess("导入成功");
                } else {
                    var errorMsg;
                    if ( response.messages && response.messages.length > 0) {
                        $.each(response.messages, function (index, item) {
                            errorMsg += item["content"]
                        });
                    }
                    common.jsmsgError(errorMsg);
                }
            });

            //当有文件添加进来时
         /*   uploader.on("fileQueued", function(file, response){
                common.confirm("是否上传文件", function(){
                    uploader.upload();
                },function(){
                    uploader.reset();
                });
                //common.jsmsgSuccess("文件上传成功");
            });
*/


        }

    };
    exports.init = function (options) {
        return internal.init(options);
    };
});

后台代码：

@RequestMapping("/imStClinic")
@ResponseBody
@MethodAction(operateCode = OperateCode.Query, functionName = "导入标准诊项字典")
public ServiceResultT<String> imStClinic(@RequestParam("file") MultipartFile photoUpload, HttpServletRequest request, HttpServletResponse response) throws Exception {
    ServiceResultT<String> result = new ServiceResultT<>();
    InputStream input = photoUpload.getInputStream();
    String params = request.getParameter("params");
    JSONObject obj = JSONObject.parseObject(params);
    String modelName = obj.getString("modelName");
    String resultMsg =  ServiceFactory.getImpOrExpService().impCommonInvoke(modelName,input);
    result.setIsSuccess(true);
    result.setResult("成功");
    return result;

}