给出以下XML(示例):
<?xml version="1.0" encoding="UTF-8"?>
<rsb:VersionInfo xmlns:atom="http://www.w3.org/2005/Atom" xmlns:rsb="http://ws.rsb.de/v2">
<rsb:Variant>Windows</rsb:Variant>
<rsb:Version>10</rsb:Version>
</rsb:VersionInfo>
我需要获取Variant
和Version
的值。我目前的方法是使用XPath,因为我不能依赖给定的结构。我所知道的是文档中某处有一个元素rsb:Version
。
XPath xpath = XPathFactory.newInstance().newXPath();
String expression = "//Variant";
InputSource inputSource = new InputSource("test.xml");
String result = (String) xpath.evaluate(expression, inputSource, XPathConstants.STRING);
System.out.println(result);
然而,这不输出任何东西。我尝试了以下XPath表达式:
什么是正确的XPath表达式?或者是否有更简单的方法来获得这个元素?
答案 0 :(得分:3)
我建议只循环浏览文档以找到给定的标记
public static void main(String[] args) throws SAXException, IOException,ParserConfigurationException, TransformerException {
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory
.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document document = docBuilder.parse(new File("test.xml"));
NodeList nodeList = document.getElementsByTagName("rsb:VersionInfo");
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
// do something with the current element
System.out.println(node.getNodeName());
}
}
}
编辑:Yassin指出它不会获得子节点。这应该指出你正确的方向让孩子们。
private static List<Node> getChildren(Node n)
{
List<Node> children = asList(n.getChildNodes());
Iterator<Node> it = children.iterator();
while (it.hasNext())
if (it.next().getNodeType() != Node.ELEMENT_NODE)
it.remove();
return children;
}