JAVA XML：获取内容节点

Question

我有这样的xml：

<root>
   <countries>
      <country id="98" nom="Espagne"/>
      <country id="76" nom="France"/>
   </countries>
</root>

我可以用这个来读取根标记：

Document doc = DocumentBuilderFactory.newInstance()
                    .newDocumentBuilder().parse(XmlFile);

System.out.println("Root element :" + doc.getDocumentElement().getNodeName());      

Node NodeCountries = doc.getElementsByTagName("countries").item(0);     

System.out.println(nodeToString(NodeCountries));


private static String nodeToString(Node node) throws Exception{
            StringWriter sw = new StringWriter();

              Transformer t = TransformerFactory.newInstance().newTransformer();
              t.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
              t.setOutputProperty(OutputKeys.INDENT, "yes");
              t.transform(new DOMSource(node), new StreamResult(sw));

            return sw.toString();
          }

但是我无法获得像这样的国家标签内的所有内容：

<country id="98" nom="Espagne"/>
<country id="76" nom="France"/>

Answer 1

以下示例将打印<country id="98" nom="Espagne"/><country id="76" nom="France"/>：

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.InputSource;
import java.io.StringReader;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;


...

String xml = "<root><countries><country id=\"98\" nom=\"Espagne\"/><country id=\"76\" nom=\"France\"/></countries></root>";
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
InputSource is = new InputSource(new StringReader(xml));
Document doc = builder.parse(is);
Node node = doc.getElementsByTagName("countries").item(0);
String innerXml = getInnerXml(node);
System.out.println(innerXml);

并且辅助方法getInnerXml(node)看起来像这样：
private String getInnerXml(Node node) {
    DOMImplementationLS lsImpl = (DOMImplementationLS) node.getOwnerDocument().getImplementation().getFeature("LS", "3.0");
    LSSerializer lsSerializer = lsImpl.createLSSerializer();
    lsSerializer.getDomConfig().setParameter("xml-declaration", false);
    NodeList childNodes = node.getChildNodes();
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < childNodes.getLength(); i++) {
        sb.append(lsSerializer.writeToString(childNodes.item(i)));
    }
    return sb.toString();
}

让我知道我是否误解了要求（再次！）。
<< [[[warning]这不是一个很好的解决方案。它涉及“手工”构造XML（即字符串连接），并且如果输入出乎意料的不同或复杂，则会带来结果易碎甚至损坏的风险。