bstream = new ByteArrayOutputStream();
Transformer xformer = TransformerFactory.newInstance()
.newTransformer();
Source source = new DOMSource(doc);
Result result = new StreamResult(bstream);

xformer.setOutputProperty(OutputKeys.INDENT,"yes");

xformer.transform(source, result);

这样写的话xml只能标签换行 ，并不能缩进
求高手提供解决方法
怎么样才能缩进