用jspsmartupload上传一张图片，再重新上传第二张的时候会吧第一张覆盖掉

        SmartUpload mySmartUpload = new SmartUpload();
        ServletConfig config = this.getServletConfig();
        mySmartUpload.initialize(config, request, response);
        try {

            mySmartUpload.setAllowedFilesList("jpg,png,jpeg");
            mySmartUpload.upload("utf-8");
            Request surequest = mySmartUpload.getRequest();
            //String imageName = req.getParameter("image");
            File file = mySmartUpload.getFiles().getFile(0);
            if (!file.isMissing()) {
                String filePath = "/upload/";
                filePath += file.getFileName();

                file.saveAs(filePath, SmartUpload.SAVE_VIRTUAL);

                String menu_name =surequest.getParameter("menu_name");
                String menu_price_str = surequest.getParameter("menu_price");
                double menu_price = Double.parseDouble(menu_price_str);
                String menu_details = surequest.getParameter("menu_details");

                Menu menu = new Menu();
                menu.setMenu_name(menu_name);
                menu.setMenu_price(menu_price);
                menu.setMenu_details(menu_details);
                menu.setMenu_addr(filePath);

                boolean flag = aService.add(menu);
                //response.setContentType("text/html;charset=utf-8");
                PrintWriter out = response.getWriter();
                if (flag) {
                    out.write("上传成功！");
                    response.sendRedirect(request.getContextPath() + "/admin/allMenu.jsp");
                } else {
                    out.write("上传失败！");
                }
                out.close();
            }
        } catch (SmartUploadException e) {
            e.printStackTrace();
        }

添加第二张图片的时候就会把第一张覆盖掉；求解决办法

filePath += file.getFileName();
看下文件名和路径，是不是每次都一样
可以用随机数或者当前时间作为文件名的前缀后缀