SAX解析——获取文本节点的高效方法

解析XML文件是编程中常见的任务之一，而SAX（Simple API for XML）解析器是一种高效的解析方式。在使用SAX解析器时，获取文本节点是常见的需求之一。本文将介绍如何使用SAX解析器高效地获取文本节点，并提供一个简单的案例代码。

import org.xml.sax.*;
public class MyHandler implements ContentHandler {
    // other methods
    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        String text = new String(ch, start, length);
        // 处理文本节点
    }
}

import org.xml.sax.*;
import org.xml.sax.helpers.*;
public class Main {
    public static void main(String[] args) throws Exception {
        String xml = "John25";
        XMLReader reader = XMLReaderFactory.createXMLReader();
        MyHandler handler = new MyHandler();
        reader.setContentHandler(handler);
        reader.parse(new InputSource(new StringReader(xml)));
    }
}
class MyHandler extends DefaultHandler {
    private StringBuilder text;
    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        text = new StringBuilder();
    }
    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        text.append(new String(ch, start, length));
    }
    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        if (qName.equals("name")) {
            System.out.println("Name: " + text.toString());
        } else if (qName.equals("age")) {
            System.out.println("Age: " + text.toString());
        }
    }
}