What are the commonly used XML parsing tools in Java function libraries?

XML parsing tool: JAXB: Generate Java classes, automate XML and object conversion. DOM: API to access and manipulate XML, providing granular control. SAX: event-driven parser, high performance but difficult to control. StAX: A stream-based parser that combines the best of SAX and DOM.

XML parsing tools in Java function library

Java provides a variety of toolkits for XML parsing to facilitate reading, Write and modify XML documents. The following are the most commonly used:

1. JAXB (Java Schema Binding XML)

• A code generation tool that can generate XML schemas (XSD) Java classes.
• Automated conversion between XML documents and Java objects.

Code example:

// 生成 Java 类
JAXBContext context = JAXBContext.newInstance(Customer.class);
SchemaOutputResolver outputResolver = new SchemaOutputResolver() {
    @Override
    public Result createOutput(String namespaceUri, String suggestedFileName) {
        return new StreamResult(new File("customer.xsd"));
    }
};
context.generateSchema(outputResolver);

// 绑定 XML 文档到 Java 对象
Unmarshaller unmarshaller = context.createUnmarshaller();
Customer customer = (Customer) unmarshaller.unmarshal(new File("customer.xml"));

2. DOM (Document Object Model)

• A W3C Standard that defines APIs for accessing and manipulating XML documents.
• Provides more granular control of XML documents, but at the cost of greater complexity.

Code example:

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(new File("document.xml"));
NodeList nodes = document.getElementsByTagName("name");

3. SAX (Simple API for XML)

• a An event-driven XML parser that reads XML documents one by one in the form of a stream.
• Provides better performance, but the event handling model makes control more difficult.

Code example:

XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setContentHandler(new MyContentHandler());
reader.parse(new InputSource(new File("document.xml")));

class MyContentHandler implements ContentHandler {
    @Override
    public void startElement(String uri, String localName, String qName, Attributes atts) { /* ... */ }
    @Override
    public void characters(char[] ch, int start, int length) { /* ... */ }
    // ...其他方法
}

4. StAX (Streaming API for XML)

• 一A stream-based XML parser that provides the advantages of SAX and DOM.
• Use iterators to traverse XML documents to provide more flexible processing.

Code example:

XMLInputFactory factory = XMLInputFactory.newInstance();
XMLStreamReader reader = factory.createXMLStreamReader(new File("document.xml"));
while (reader.hasNext()) {
    switch (reader.getEventType()) {
        case XMLStreamConstants.START_ELEMENT:
            System.out.println(reader.getLocalName());
            break;
        case XMLStreamConstants.CHARACTERS:
            System.out.println(reader.getText());
            break;
        // ...其他事件
    }
    reader.next();
}

Choose the appropriate parsing tool based on your specific needs. For automated transformations and data binding, JAXB is a good choice. For more granular document control, DOM may be more suitable. SAX and StAX provide better performance but require more advanced programming skills.

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