JAXP 和 JAXB 有什么区别

JAXP（Java API for XML Processing）和JAXB（Java Architecture for XML Binding）是Java平台上用于处理XML的两个重要技术。虽然它们都与XML相关，但在实际应用中有着不同的用途和功能。

java
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
public class JAXPExample {
    public static void main(String[] args) {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse("example.xml");
            NodeList nodeList = document.getElementsByTagName("book");
            for (int i = 0; i < nodeList.getLength(); i++) {
                Node node = nodeList.item(i);
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    System.out.println("Title: " + node.getAttributes().getNamedItem("title").getNodeValue());
                    System.out.println("Author: " + node.getAttributes().getNamedItem("author").getNodeValue());
                    System.out.println("Price: " + node.getAttributes().getNamedItem("price").getNodeValue());
                    System.out.println("------------------------------------");
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

java
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import java.io.File;
public class JAXBExample {
    public static void main(String[] args) {
        try {
            Book book = new Book();
            book.setTitle("Java Programming");
            book.setAuthor("John Smith");
            book.setPrice(29.99);
            JAXBContext context = JAXBContext.newInstance(Book.class);
            Marshaller marshaller = context.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            marshaller.marshal(book, new File("example.xml"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}