XMLConverter.java 文件源码

/**
 * Count nodes which are given via xpath expression
 */
public static Double countNodes(Node node, String nodePath)
        throws XPathExpressionException {
    final XPathFactory factory = XPathFactory.newInstance();
    final XPath xpath = factory.newXPath();
    final XPathExpression expr = xpath.compile("count(" + nodePath + ')');
    return (Double) expr.evaluate(node, XPathConstants.NUMBER);
}