将XML文档转换为String

Question

我正在使用以下代码更改xml文档：

DocumentBuilderFactory fty1 = DocumentBuilderFactory.newInstance();
   fty1.setNamespaceAware(true);
   DocumentBuilder builder1 = fty1.newDocumentBuilder();
   ByteArrayInputStream bais1 = new ByteArrayInputStream(tr1.getBytes());//tr1=xml string
   Document xmldoc1=builder1.parse(bais1);
   xmldoc1.getElementsByTagName("userID").item(0).setTextContent("123123132");

xmldoc1包含更改的表单。现在如何将它转换为字符串，以便新的doument可以传递给其他人。

Answer 1

Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");        
StringWriter sw = new StringWriter();
StreamResult result = new StreamResult(sw);
DOMSource source = new DOMSource(xmldoc1);
transformer.transform(source, result);
String xmlString = sw.toString();