Spring上传文件

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在使用Spring上传文件时，当文件过多时，会产生文件名重复的问题，所以就提出了用时间来划分文件夹来存放文件的方式，这种方式能减少产生重复文件的概率，但也有不可避免的在一个小时内上传同一个文件两次的概率，这样也会产生覆盖

public class UpLoadFile extends HttpServlet{  private static final long serialVersionUID = 1L;  private static final Logger LOG = Logger.getLogger(UpLoadFile.class.getName());  private int maxPostSize = 1048576000;  public void doGet(HttpServletRequest request, HttpServletResponse resopnse)    throws IOException  {    doPost(request, resopnse);  }  public void doPost(HttpServletRequest request, HttpServletResponse resopnse)    throws IOException  {    try    {      upLoad(request, resopnse);    } catch (Exception e) {      e.printStackTrace();    }  }  private void upLoad(HttpServletRequest request, HttpServletResponse resopnse)    throws Exception  {    String uploadPath = "上传文件存放的位置";    LOG.debug("uploadPath:" + uploadPath);    if (!new File(uploadPath).exists()) {      new File(uploadPath).mkdirs();    }    resopnse.setContentType("text/html;charset=UTF-8");    request.setCharacterEncoding("UTF-8");    DiskFileItemFactory factory = new DiskFileItemFactory();    factory.setSizeThreshold(20480);        ServletFileUpload upload = new ServletFileUpload(factory);    upload.setSizeMax(this.maxPostSize);    try {      List fileItems = upload.parseRequest(request);      Iterator iter = fileItems.iterator();      String fileNameSave = request.getParameter("filename");      Date date=new Date();      DateFormat format=new SimpleDateFormat("yyyyMMddHH");      String time=format.format(date);      String fileSavePath = uploadPath+time+"/";      File filePath =new File(fileSavePath);        //如果文件夹不存在则创建        if  (!filePath .exists()  && !filePath .isDirectory())          {               System.out.println("//不存在");          filePath .mkdir();        } else       {          System.out.println("//目录存在");      }        String exFileName = "";      while (iter.hasNext()) {        FileItem item = (FileItem)iter.next();        String itemName = item.getName();        if (!item.isFormField()) {          if (itemName.indexOf(".") > 0) {            exFileName = itemName.substring(itemName              .indexOf("."));          }          fileSavePath = fileSavePath + itemName.substring(0, itemName.indexOf("."));          try {            File skFile = new File(fileSavePath + exFileName);            if (skFile.exists()) {              skFile.delete();              item.write(new File(fileSavePath + exFileName));            } else {              item.write(new File(fileSavePath + exFileName));            }          } catch (Exception e) {            e.printStackTrace();          }        }      }      resopnse.getWriter().print("newFileName:" + fileSavePath + exFileName);      LOG.debug("upload newFileName:" + fileSavePath + exFileName);    } catch (FileUploadException e) {      e.printStackTrace();    }  }

有什么好的办法避免这样的概率发生吗，上传文件和保存到数据库的文件名和url是前端传过来的，如果采用uuid的方式，怎么在保存到数据库中获取到这个uuid呢？

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