使用java和XPath搜索xml文档中的属性

使用java和XPath搜索xml文档中的属性,java,xml,Java,Xml,我在java中有以下方法: private static String getAttributValue(String attribute, String xmlResponseBody) { String searchAttributeValue = ""; try { DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance(); Documen

我在java中有以下方法:

private static String getAttributValue(String attribute, String xmlResponseBody) {

    String searchAttributeValue = "";
    try {
        DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
        Document doc = docBuilder.parse(new InputSource(new StringReader(xmlResponseBody)));
        XPathFactory xPathFactory = XPathFactory.newInstance();
        XPath xpath = xPathFactory.newXPath();
        try {
            XPathExpression expr = xpath.compile("@" + attribute);
            Object result = expr.evaluate(doc, XPathConstants.NODESET);
            NodeList nodeList = (NodeList) result;
            Node node = nodeList.item(0);  // something wrong??
            searchAttributeValue = node.getTextContent();

        } catch (XPathExpressionException e) {
            e.printStackTrace();
        }
    } catch (ParserConfigurationException pce) {
        pce.printStackTrace();
    } catch (IOException ioe) {
        ioe.printStackTrace();
    } catch (SAXException sae) {
        sae.printStackTrace();
    }
    return searchAttributeValue;
}
我在xml文档(参数“XMLResponseBy”)中搜索属性(参数“attribute”)。我想使用XPath来解决这个任务。在代码中,我用“//something”注释错误,变量节点为null。我该怎么办?我的代码中有什么错误

谢谢!
Marwief

如果不查看示例xml(或其中的一部分),很难回答这个问题,但是您可以使用

xpath.compile("//@" + attribute)
这意味着在上下文节点及其子节点中搜索名为attribute的属性。你可以得到更多的信息