/**

     * 重命名文件

     * @param fileName

     * @return

     */

    public static void renameFile(String filePath, String fileName) {

        SimpleDateFormat fmdate = new SimpleDateFormat("yyyyMMddHHmmssSSS");

        String oldFileName = filePath+"/"+fileName;

        File oldFile = new File(oldFileName);

        String newFileName = filePath+"/"+fileName.split("\\.")[0]+fmdate.format(new Date())+"."+fileName.split("\\.")[1];

        File newFile = new File(newFileName);

        if (oldFile.exists() && oldFile.isFile()) {

            oldFile.renameTo(newFile);

        }

    }