transformer.transform（..正在抛出IO异常/找不到文件异常

DOMSource source = new DOMSource(document);
                ewFile = barcoUtil.getEwFile(Ew_Thread.ewLogger);
                StreamResult result = new StreamResult(ewFile);
                System.out.println("Ok I have came here--->"+ewFile.getAbsolutePath());
                transformer.transform(source, result);
DOMSource source = new DOMSource(document);