使用没有XSD的XMLStreamReader解组复杂的嵌套XML文件

import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

public class XMLParser {
    public static void main(String[] args) {
        try {
            XMLInputFactory factory = XMLInputFactory.newInstance();
            XMLStreamReader reader = factory.createXMLStreamReader(new FileInputStream("example.xml"));

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

                switch (event) {
                    case XMLStreamConstants.START_ELEMENT:
                        System.out.println("Start Element: " + reader.getLocalName());
                        break;
                    case XMLStreamConstants.END_ELEMENT:
                        System.out.println("End Element: " + reader.getLocalName());
                        break;
                    case XMLStreamConstants.CHARACTERS:
                        System.out.println("Text: " + reader.getText());
                        break;
                }
            }

            reader.close();
        } catch (XMLStreamException | FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}