图片上传 tomcat重新部署后图片被删除请问要如何解决

public class LedgerAdd extends BaseAction {
protected ActionForward executeAction(ActionMapping mapping,
ActionForm form, HttpServletRequest request,
HttpServletResponse response) throws Exception {
DynaActionForm LedgerForm = (DynaActionForm) form;
if (LedgerForm != null) {
FormFile file = (FormFile) LedgerForm.get("photo");
if (file != null) {
String contentType = file.getContentType();
String size = (file.getFileSize() + "bytes");
String fileUrl = file.getFileName();
int s_id = fileUrl.lastIndexOf(".");
String ext = fileUrl.substring(s_id);
String nuclideName = (String) LedgerForm.get("nuclideName")
String ratify = "2";
if (nuclideName != null && !nuclideName.equals("")
&& fileUrl != null && !fileUrl.equals("")) {
Date d = new Date();
java.text.SimpleDateFormat df = new java.text.SimpleDateFormat();
Calendar calendar = GregorianCalendar.getInstance();
df.applyPattern("yyyyMMddHHmmss");
InputStream stream = file.getInputStream();// 把文件读入
String path=request.getSession().getServletContext().getRealPath("/");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
OutputStream bos = new FileOutputStream(path+ "/UploadFile/" + df.format(d) + ext);
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead = stream.read(buffer, 0, 8192)) != -1) {
bos.write(buffer, 0, bytesRead);// 将文件写入服务器 }
bos.close();stream.close();
int addid = rs.addLedger(request.getContextPath()+ "/UploadFile/" + df.format(d) + ext,nuclideName, remark);
if (addid > 0) {
request.setAttribute("msg", "添加成功");} else {
request.setAttribute("msg", "添加失败");}} else {
request.setAttribute("msg", "带*的参数必须输入");｝｝｝
return mapping.findForward("success");｝｝