String path = request.getServletContext().getRealPath("upload") + File.separator; //形成年月日的文件夾, 下面每天一個文件夾 Calendar calendar = Calendar.getInstance(); int year = calendar.get(Calendar.YEAR); int month = calendar.get(Calendar.MONTH) + 1; int day = calendar.get(Calendar.DAY_OF_MONTH); String uploadDir = year + "" + month + File.separator + day; File uploads = new File(path + uploadDir); if (!uploads.exists()) {uploads.mkdirs();} //注意這里是mkdirs,不是mkdir //生成目錄結(jié)束