Dom4j 保存XML HL7-V3

String xmlPath = "D:\\BS004.xml";
String savePath = "D:\\BS004_save.xml";
SAXReader reader = new SAXReader();
Document doc = reader.read(xmlPath);
//添加命名空间
Map<String, String> xmlMap = new HashMap<>();
xmlMap.put("s", "urn:hl7-org:v3");
//作用域在文档上，方便多次 select Node
reader.getDocumentFactory().setXPathNamespaceURIs(xmlMap);
//消息创建时间
Node creationTimeNode = doc.selectSingleNode("/s:POOR_IN200901UV/s:creationTime/@value");
creationTimeNode.setText(DateUtil.format(new Date(), "yyyyMMddHHmmss")); 
 
Element locationNode = (Element) doc.selectSingleNode("/s:POOR_IN200901UV/s:controlActProcess/s:subject/s:placerGroup/s:componentOf1/s:encounter/s:location");
Document ss = DocumentHelper.parseText(locationNode.asXML());
locationNode.addText("转成 Element 对象，进行操作");
OutputFormat outputFormat = OutputFormat.createPrettyPrint();
outputFormat.setEncoding("UTF-8");
XMLWriter writer = null;
try {
    writer = new XMLWriter(new FileWriter(savePath), outputFormat);
    writer.write(doc);
    writer.flush();
    writer.close();
} catch (Exception e) {
    e.printStackTrace();
}