[XPath] XPath parse DOM #java

getResources

public void testXPath() throws Exception {
    DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
    documentBuilderFactory.setValidating(true);
    documentBuilderFactory.setNamespaceAware(false);
    documentBuilderFactory.setIgnoringComments(true);
    documentBuilderFactory.setIgnoringElementContentWhitespace(false);
    documentBuilderFactory.setCoalescing(false);
    documentBuilderFactory.setExpandEntityReferences(true);

    DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
    documentBuilder.setErrorHandler(new ErrorHandler() {
        @Override
        public void warning(SAXParseException exception) throws SAXException {
            System.out.println("WARN:" + exception.getMessage());
        }

        @Override
        public void error(SAXParseException exception) throws SAXException {
            System.out.println("error:" + exception.getMessage());
        }

        @Override
        public void fatalError(SAXParseException exception) throws SAXException {
            System.out.println("fatalError:" + exception.getMessage());
        }
    });
    Document doc = documentBuilder.parse(XPathTest.class.getClass().getResourceAsStream("/inventory.xml"));
    XPathFactory factory = XPathFactory.newInstance();
    XPath xPath = factory.newXPath();
    XPathExpression expr = xPath.compile("//book[author='Neal Stephenson']/title/text()");
    Object result = expr.evaluate(doc, XPathConstants.NODESET);
    System.out.println("查询作者为 Neal Stephenson 的图书标题是:");
    NodeList nodeList = (NodeList) result;
    for (int i = 0; i < nodeList.getLength(); i++) {
        System.out.println(nodeList.item(i).getNodeValue());
    }
    System.out.println("查询 1997 年之后的图书的标题");
    nodeList = (NodeList) xPath.evaluate("//book[@year>1997]/title/text()", doc, XPathConstants.NODESET);
    for (int i = 0; i < nodeList.getLength(); i++) {
        System.out.println(nodeList.item(i).getNodeValue());
    }
    System.out.println("查询 1997 年之后的图书的属性和标题：");
    nodeList = (NodeList) xPath.evaluate("//book[@year>1997]/@*|//book[@year>1997]/title/text()", doc, XPathConstants.NODESET);
    for (int i = 0; i < nodeList.getLength(); i++) {
        System.out.println(nodeList.item(i).getNodeValue());
    }
}
        
<!-- book.xml -->
<inventory>
    <book year="2000">
        <title>Snow Crash</title>
        <author>Neal Stephenson</author>
        <publisher>Spectra</publisher>
        <isbn>0553380958</isbn>
        <price>14.95</price>
    </book>
    <book year="2005">
        <title>Burning Tower</title>
        <author>Larry Niven</author>
        <author>Jerry Pournelle</author>
        <publisher>Pocket</publisher>
        <isbn>0743416910</isbn>
        <price>5.99</price>
    </book>
    <book year="1995">
        <title>Zodiac</title>
        <author>Neal Stephenson</author>
        <publisher>Spectra</publisher>
        <isbn>0553573862</isbn>
        <price>7.50</price>
    </book>
    <!--more books ... -->
</inventory>