如何使用Java在XML文件中搜索关键字？

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

public class XMLSearch {
    public static void main(String[] args) {
        try {
            // 创建DocumentBuilder对象
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            
            // 加载XML文件
            Document document = builder.parse("path/to/xml/file.xml");
            
            // 获取指定标签名的元素节点列表
            NodeList nodeList = document.getElementsByTagName("tagname");
            
            // 遍历元素节点列表
            for (int i = 0; i < nodeList.getLength(); i++) {
                Element element = (Element) nodeList.item(i);
                
                // 获取节点的文本内容
                String textContent = element.getTextContent();
                
                // 进行关键字匹配
                if (textContent.contains("keyword")) {
                    // 匹配成功，进行相应操作
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class XMLSearch {
    public static void main(String[] args) {
        try {
            // 创建SAXParser对象
            SAXParserFactory factory = SAXParserFactory.newInstance();
            SAXParser parser = factory.newSAXParser();
            
            // 解析XML文件
            parser.parse("path/to/xml/file.xml", new CustomHandler());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    static class CustomHandler extends DefaultHandler {
        private boolean isTargetElement = false;
        
        @Override
        public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
            if (qName.equals("tagname")) {
                isTargetElement = true;
            }
        }
        
        @Override
        public void characters(char[] ch, int start, int length) throws SAXException {
            if (isTargetElement) {
                String textContent = new String(ch, start, length);
                
                // 进行关键字匹配
                if (textContent.contains("keyword")) {
                    // 匹配成功，进行相应操作
                }
            }
        }
        
        @Override
        public void endElement(String uri, String localName, String qName) throws SAXException {
            if (qName.equals("tagname")) {
                isTargetElement = false;
            }
        }
    }
}