在Java中，可以使用javax.xml.xpath包中的類來執行XPath表達式。以下是使用XPath的一般步驟：
XPathFactory xPathFactory = XPathFactory.newInstance();
XPath xPath = xPathFactory.newXPath();
XPathExpression xpathExpr = xPath.compile("XPath表達式");
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(new File("xml文件路徑"));
NodeList nodeList = (NodeList) xpathExpr.evaluate(doc, XPathConstants.NODESET);
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
// 處理每個節點
}
以上是使用XPath在Java中查詢XML文檔的一般方法，可以根據具體需求進一步擴展和處理查詢結果。
