Struts 2多文件上传路径有关问题

public String execute() throws Exception{        //取得需要上传的文件数组        File[] files = getUpload();        //遍历每个需要上传的文件        for (int i = 0; i < files.length; i++) {            System.out.println(files[i]);            //以服务器的文件保存地址和源文件名建立上传文件输出流            FileOutputStream fos = new FileOutputStream(getSavePath()+"\\"+getUploadFileName()[i]);            //以每个需要上传的文件建立输入流            FileInputStream fis = new FileInputStream(files[i]);            //将每个需要上传的文件写入            byte[] buffer = new byte[1024];            int length = 0;            while ((length=fis.read(buffer))>0) {                fos.write(buffer,0,length);            }            fos.close();        }        return SUCCESS;    }

<package name="mystruts" extends="struts-default">        <action name="upload" class="com.app.action.UploadAction">            <!-- 动态设置Action的savePath属性 -->            <param name="savePath">/upload</param>            <!-- 配置文件上传的拦截器 -->                                   <interceptor-ref name="fileUpload">                <!-- 配置允许上传的文件类型 -->                <param name="allowedTypes">image/png,image/gif,image/jpeg</param>                <param name="maximumSize">20480000</param>            </interceptor-ref>                        <!-- 配置系统默认的拦截器 -->            <interceptor-ref name="defaultStack"></interceptor-ref>            <result name="success">/success.jsp</result>            <result name="input">/upload.jsp</result>        </action>    </package>

private File[] files;    private File[] fileFileName;    private File[] fileContentType;//getters && setterspublic String execute() throws Exception {      for (int i = 0; i < files.length; i++) {                   //...            String root = ServletActionContext.getRequest().getSession()                    .getServletContext().getRealPath("/upload");                      //加点东西  保证目录： %deployPath%+"/upload" 存在            File destFile = new File(root, fileFileName.get(i));                   //...        }