struts2上传文件问题

<action name="add_standardFiles" class="standardFilesAction" method="addStandardFiles">

      <interceptor-ref name="fileUpload">        

        <param name="allowedTypes">text/plain,image/jpeg,application/msword</param>        

      </interceptor-ref>

      <interceptor-ref name="defaultStack" /> 

      <result name="success" type="redirectAction">standardFiles</result>

      <result name="successAndContinueAdd" type="chain">load_add_standardFiles</result>

      <result name="fail" >/standardfiles/add_standardfiles.jsp</result>

      <result name="input">/error.jsp</result>

</action>

    <td>文件名称：</td>

    <td><input type="file" name="myFile" id="myFile" /></td>

public String addStandardFiles(){

		try {

			if(myFile==null){				

				return "fail";

			}

			

			String sFileCode = DBProcedure.getCreateTableNo(1);

			standardFiles.setFileCode(sFileCode);

			standardFiles.setFileObject(myFile);//对象获得文件信息

			standardFiles.setFileName(myFileFileName);//对象获得文件名称

			SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

			standardFiles.setStatusDate(sdf.format(new Date()));

			HttpSession session = ServletActionContext.getRequest().getSession();

			standardFiles.setUserCode(session.getAttribute("staffCode").toString());

			standardFiles.setUserName(session.getAttribute("username").toString());

			standardFiles.setStatus("1");

			standardFilesService.addStandardFiles(standardFiles);

			

				//保存成功后,再打开新增页面等待下一次新增

				return SUCCESS;

				//System.out.println("N...");

				//return SUCCESS;

		} catch (Exception e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

		return SUCCESS;

		

	}