java - 在 Java 中解析 XML 以仅获取文本

Question

我有以下 XML

<?xml version="1.0" encoding="UTF-8"?>
<wddxPacket version="1.0">
   <header />
   <data>
      <string>
         <char code="0d" />
         <char code="0a" />
         Provider: HERO - 2.xx
         <char code="0d" />
         <char code="0a" />
         <char code="0d" />
         <char code="0a" />
         <char code="0d" />
         <char code="0a" />
         DBvendor=EPA
         <char code="0d" />
         <char code="0a" />
         Text-encoding=UTF-8
         <char code="0d" />
         <char code="0a" />
         <char code="0d" />
         <char code="0a" />
         TY  - RPRT
         <char code="0d" />
         <char code="0a" />
         LB  - 94742
         <char code="0d" />
         <char code="0a" />
         AU  - IARC,
         <char code="0d" />
         <char code="0a" />
         LU  - International Agency for Research on Cancer
         <char code="0d" />
         <char code="0a" />
         PY  - 1985
         <char code="0d" />
         <char code="0a" />
         TY  - JOUR
         <char code="0d" />
         <char code="0a" />
         LB  - 94743
         <char code="0d" />
         <char code="0a" />
         AU  - Shamilov, T. A.
         <char code="0d" />
         <char code="0a" />
         AU  -  Abasov, D. M.
         <char code="0d" />
         <char code="0a" />
         PY  - 1973
         <char code="0d" />
         <char code="0a" />
         J2  - Med Tr Prom Ekol
         <char code="0d" />
         <char code="0a" />
         T2  - Meditsina Truda i Promyshlennaya Ekologiya
         <char code="0d" />
         <char code="0a" />
         JF  - Meditsina Truda i Promyshlennaya Ekologiya
         <char code="0d" />
         <char code="0a" />
         SP  - 12-15
         <char code="0d" />
         <char code="0a" />
         SN  - ISSN 1026-9428
         <char code="0d" />
         <char code="0a" />
         TI  - Effect of allyl chloride on animals under experimental conditions
         <char code="0d" />
         <char code="0a" />
         VL  - 8
         <char code="0d" />
         <char code="0a" />
         ER  -
         <char code="0d" />
         <char code="0a" />
         <char code="0d" />
         <char code="0a" />
         TY  - JOUR
         <char code="0d" />
         <char code="0a" />
      </string>
   </data>
</wddxPacket>

如何解析它以获取文本？

Provider: HERO - 2.xx
DBvendor=EPA
Text-encoding=UTF-8
TY  - RPRT
LB  - 94742
AU  - IARC,

我需要 TY 以后的文本(这是 RIS 格式文件)，但如果我只能获取所有文本，我仍然可以管理。我在网上尝试过，但在那里找不到太多东西。我需要在 Java 中执行此操作。

我试过了

        Document doc = null;
        DocumentBuilderFactory dbf = null;
        DocumentBuilder docBuild = null;
        dbf = DocumentBuilderFactory.newInstance();
        docBuild = dbf.newDocumentBuilder();
        doc = docBuild.parse(file);
        Node node = doc.getDocumentElement();
        XPathFactory xfact = XPathFactory.newInstance();
        XPath xpath = xfact.newXPath();
        String xpathStr = "/wddxPacket/header/";
        Object res = xpath.evaluate(xpathStr, doc, XPathConstants.NODESET);
        NodeList nodeList = (NodeList) res;

但我什么也没得到。

Answer 1

您需要 xpath : //string/text() 来获取文本值。 以下 java 代码将为您提供文本值列表。

        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

        DocumentBuilder db = dbf.newDocumentBuilder();

        Document doc = db.parse( new File( file ) );

        XPathFactory xPathFactory = XPathFactory.newInstance();
        XPath xpath = xPathFactory.newXPath();

        XPathExpression expr = xpath.compile( "//string/text()");

        Object eval = expr.evaluate( doc, XPathConstants.NODESET );
        List<String> textValues = new ArrayList<String>();
        if ( eval != null && eval instanceof NodeList )
        {
            NodeList list = (NodeList)eval;
            for ( int i = 0 ; i < list.getLength(); i++ )
            {
                Node node = list.item(i);
                String text = node.getNodeValue().trim();

                if ( !text.isEmpty() )
                {
                    System.out.println( text );
                    textValues.add( text );
                }
            }
        }

文本值收集在变量textValues()中。