ajax 上传文件

<script src="${pageContext.request.contextPath}/jslib/jquery.form.js"></script> function doUpload() {  $("#uploadForm").ajaxSubmit({      type:"post",  //提交方式      url:"${pageContext.request.contextPath}/filemanager/fileUpload/uploadFiles", //请求url      success:function(result){ //提交成功的回调函数      result = $.parseJSON(result);if (result.success) {parent.$.modalDialog.handler.dialog('close');parent.$.messager.alert('提示信息', result.msg, 'success');} else {//parent.$.messager.alert('错误', result.msg, 'error');}    }  });  }@RequestMapping(value = "/fileUpload/uploadFiles")    @ResponseBody    public Json fileUploadUploadFiles(@RequestParam(value = "file", required = false) MultipartFile file, HttpServletRequest request, ModelMap model) {.........}</script><form  method="post" enctype="multipart/form-data" id="uploadForm" name="uploadForm"><table class="grid"><td style="width: 30%">文件</td><td><input name="file"  class="easyui-filebox"  style="width: 70%;height: 100%"    data-options="required:true"></td></tr></table></form>