java - 使用 XPATH 在 Java 中解析 XML 节点

Question

我刚刚开始尝试 Jaxp13XPathTemplate，但我对解析 XML 有点困惑。

这是示例 XML

<fxDataSets> 
<fxDataSet name="NAME_A">
  <link rel="self" href="http://localhost:8080/linkA"/>
  <baseCurrency>EUR</baseCurrency>
  <description>TEST DESCRIPTION A</description>
</fxDataSet>

<fxDataSet name="NAME_B">
  <link rel="self" href="http://localhost:8080/linkB"/>
  <baseCurrency>EUR</baseCurrency>
  <description>TEST DESCRIPTION B</description>
</fxDataSet>
<fxDataSets>  

我已经能够获取 NAME_A 和 NAME_B，但是我无法获取这两个节点的描述。

这是我的想法。

XPathOperations  xpathTemplate = new Jaxp13XPathTemplate();
    String fxRateURL = "http://localhost:8080/rate/datasets";
    RestTemplate restTemplate = new RestTemplate();
    Source fxRate = restTemplate.getForObject(fxRateURL,Source.class);
    List<Map<String, Object>> currencyList = xpathTemplate.evaluate("//fxDataSet", fxRate , new NodeMapper() {
        public Object mapNode(Node node, int i) throws DOMException 
        {
            Map<String, Object> singleFXMap = new HashMap<String, Object>();
            Element fxDataSet = (Element) node;
            String id    = fxDataSet.getAttribute("name");

            /* This part is not working
            if(fxDataSet.hasChildNodes())
            {
                NodeList nodeList = fxDataSet.getChildNodes();
                int length = nodeList.getLength();

                for(int index=0;i<length;i++)
                {
                    Node childNode = nodeList.item(index);
                    System.out.println("childNode name"+childNode.getLocalName()+":"+childNode.getNodeValue());
                }

            }*/

            return new Object();
        }
    });

Answer 1

尝试使用 dom4j 库，它是 saxReader。

    InputStream is = FileUtils.class.getResourceAsStream("file.xml");

    SAXReader reader = new SAXReader();
    org.dom4j.Document doc = reader.read(is);
    is.close();
    Element content = doc.getRootElement();  //this will return the root element in your xml file
    List<Element> methodEls = content.elements("element"); // this will retun List of all Elements with name "element"