字符串xml生成xml文件

/**
* 将字符串的xml转换成org.w3c.dom.Document对象
* @param xml
* @return
*/
public static Document getDocument(String xml) {
Document document = null;
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
InputStream is = new ByteArrayInputStream(xml.getBytes());
document = db.parse(is);
} catch (Exception e) {
e.printStackTrace();
}
return document;
}
/**
* 将org.w3c.dom.Document对象写入到指定文件
*
* @param doc
* @param fileName
* @throws Exception
*/
private static void outputXml(Document doc, String fileName) {
try {
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
DOMSource source = new DOMSource(doc);
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");//增加换行缩进，但此时缩进默认为0
transformer.setOutputProperty("{https://xml.apache.org/xslt}indent-amount", "2");//设置缩进为2
PrintWriter pw = new PrintWriter(( new OutputStreamWriter( new FileOutputStream(fileName), "UTF-8")));
StreamResult result = new StreamResult(pw);
transformer.transform(source, result);
} catch (Exception e) {
e.printStackTrace();
}
}