java - 如何仅获取具有值 Stax 的元素

Question

我试图只获取包含文本的元素，例如 xml:

<root>
      <Item>
        <ItemID>4504216603</ItemID>
        <ListingDetails>
          <StartTime>10:00:10.000Z</StartTime>
          <EndTime>10:00:30.000Z</EndTime>
          <ViewItemURL>http://url</ViewItemURL>
            ....
           </item> 

它应该打印

Element Local Name:ItemID
Text:4504216603
Element Local Name:StartTime
Text:10:00:10.000Z
Element Local Name:EndTime
Text:10:00:30.000Z
Element Local Name:ViewItemURL
Text:http://url

此代码还打印根、项目等。这是否可能，一定是我无法通过谷歌搜索它。

XMLInputFactory inputFactory = XMLInputFactory.newInstance();
InputStream input = new FileInputStream(new File("src/main/resources/file.xml"));
XMLStreamReader xmlStreamReader = inputFactory.createXMLStreamReader(input);

while (xmlStreamReader.hasNext()) {
    int event = xmlStreamReader.next();

    if (event == XMLStreamConstants.START_ELEMENT) {
    System.out.println("Element Local Name:" + xmlStreamReader.getLocalName());
    }

    if (event == XMLStreamConstants.CHARACTERS) {
                        if(!xmlStreamReader.getText().trim().equals("")){
                        System.out.println("Text:"+xmlStreamReader.getText().trim());
                        }
                }

            }

编辑不正确的行为:

    Element Local Name:root
    Element Local Name:item
    Element Local Name:ItemID
    Text:4504216603
    Element Local Name:ListingDetails
    Element Local Name:StartTime
    Text:10:00:10.000Z
    Element Local Name:EndTime
    Text:10:00:30.000Z
    Element Local Name:ViewItemURL
    Text:http://url

我不想打印没有文本的根节点和其他节点，只打印我上面写的输出。谢谢

Answer 1

试试这个:

while (xmlStreamReader.hasNext()) {
    int event = xmlStreamReader.next();

    if (event == XMLStreamConstants.START_ELEMENT) {
        try {
            String text = xmlStreamReader.getElementText();
            System.out.println("Element Local Name:" + xmlStreamReader.getLocalName());
            System.out.println("Text:" + text);
        } catch (XMLStreamException e) {

        }
    }

}

基于 SAX 的解决方案(有效):

public class Test extends DefaultHandler {

    public static void main(String[] args) throws ParserConfigurationException, IOException, SAXException, XPathExpressionException, XMLStreamException {
        SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
        parser.parse(new File("src/file.xml"), new Test());
    }

    private String currentName;

    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        currentName = qName;
    }

    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        String string = new String(ch, start, length);
        if (hasText(string)) {
            System.out.println(currentName);
            System.out.println(string);
        }
    }

    private boolean hasText(String string) {
        string = string.trim();
        return string.length() > 0;
    }
}