在创建xml Transformer时添加自定义行

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(new File("input.xml"));

TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();

TransformerHandler customHandler = ((SAXTransformerFactory) transformerFactory).newTransformerHandler();
transformer.setResult(new StreamResult(new File("output.xml")));
transformer.transform(new DOMSource(document), new SAXResult(customHandler));

class CustomHandler implements ContentHandler {
    // 实现ContentHandler接口的方法
    // 在需要添加自定义行的地方，使用startElement方法添加自定义行
    // 例如，在根元素的开始标签之后添加一个自定义行
    public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
        // 添加自定义行
        String customRow = "<customRow>Custom Content</customRow>";
        char[] customRowChars = customRow.toCharArray();
        contentHandler.characters(customRowChars, 0, customRowChars.length);
        
        // 调用原始的ContentHandler的startElement方法
        contentHandler.startElement(uri, localName, qName, atts);
    }
    
    // 实现其他ContentHandler接口的方法
    // ...
}

customHandler.setContentHandler(contentHandler);