如何用Java从XML页面中获取"prensentationURL“？

import org.w3c.dom.*;
import javax.xml.parsers.*;
import java.io.*;

public class XMLParser {
    public static void main(String[] args) {
        try {
            // 创建DOM解析器工厂
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            // 创建DOM解析器
            DocumentBuilder builder = factory.newDocumentBuilder();
            // 解析XML文件，获取Document对象
            Document document = builder.parse(new File("your_xml_file.xml"));
            
            // 获取根节点
            Element root = document.getDocumentElement();
            // 获取"presentationURL"节点
            NodeList nodeList = root.getElementsByTagName("presentationURL");
            if (nodeList.getLength() > 0) {
                Node presentationURLNode = nodeList.item(0);
                String presentationURL = presentationURLNode.getTextContent();
                System.out.println("presentationURL: " + presentationURL);
            } else {
                System.out.println("presentationURL not found.");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import org.xml.sax.*;
import org.xml.sax.helpers.*;
import javax.xml.parsers.*;
import java.io.*;

public class XMLParser {
    public static void main(String[] args) {
        try {
            // 创建SAX解析器工厂
            SAXParserFactory factory = SAXParserFactory.newInstance();
            // 创建SAX解析器
            SAXParser parser = factory.newSAXParser();
            // 创建自定义的Handler
            MyHandler handler = new MyHandler();
            // 解析XML文件
            parser.parse(new File("your_xml_file.xml"), handler);
            
            String presentationURL = handler.getPresentationURL();
            if (presentationURL != null) {
                System.out.println("presentationURL: " + presentationURL);
            } else {
                System.out.println("presentationURL not found.");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

class MyHandler extends DefaultHandler {
    private String presentationURL;
    private boolean isPresentationURL;

    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        if (qName.equalsIgnoreCase("presentationURL")) {
            isPresentationURL = true;
        }
    }

    public void characters(char[] ch, int start, int length) throws SAXException {
        if (isPresentationURL) {
            presentationURL = new String(ch, start, length);
            isPresentationURL = false;
        }
    }

    public String getPresentationURL() {
        return presentationURL;
    }
}