Java XML -删除节点后-空白线仍然存在-如何删除？

   public static void main(String[] args) {

       try {

           // 加载XML文件

           DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

           DocumentBuilder builder = factory.newDocumentBuilder();

           Document document = builder.parse(new File("path/to/xml/file.xml"));

           // 获取根节点

           Element root = document.getDocumentElement();

           // 遍历所有节点

           removeWhitespaceNodes(root);

           // 保存修改后的XML文件

           saveDocument(document, "path/to/xml/file.xml");

       } catch (Exception e) {

           e.printStackTrace();

       }

   }

   private static void removeWhitespaceNodes(Node node) {

       NodeList children = node.getChildNodes();

       for (int i = children.getLength() - 1; i >= 0; i--) {

           Node child = children.item(i);

           if (child.getNodeType() == Node.TEXT_NODE && child.getTextContent().trim().isEmpty()) {

               node.removeChild(child);

           } else if (child.getNodeType() == Node.ELEMENT_NODE) {

               removeWhitespaceNodes(child);

           }

       }

   }

   private static void saveDocument(Document document, String filePath) throws IOException {

       OutputStream outputStream = new FileOutputStream(filePath);

       javax.xml.transform.Transformer transformer = javax.xml.transform.TransformerFactory.newInstance().newTransformer();

       transformer.setOutputProperty(javax.xml.transform.OutputKeys.INDENT, "yes");

       transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");

       javax.xml.transform.Result output = new javax.xml.transform.stream.StreamResult(outputStream);

       javax.xml.transform.Source input = new javax.xml.transform.dom.DOMSource(document);

       transformer.transform(input, output);

       outputStream.close();

   }

   public static void main(String[] args) {

       try {

           // 加载XML文件

           SAXParserFactory factory = SAXParserFactory.newInstance();

           SAXParser parser = factory.newSAXParser();

           parser.parse(new File("path/to/xml/file.xml"), new RemoveWhitespaceHandler());

       } catch (Exception e) {

           e.printStackTrace();

       }

   }

   private static class RemoveWhitespaceHandler extends DefaultHandler {

       private StringBuilder content;

       private OutputStream outputStream;

       @Override

       public void startDocument() throws SAXException {

           content = new StringBuilder();

       }

       @Override

       public void characters(char[] ch, int start, int length) throws SAXException {

           content.append(ch, start, length);

       }

       @Override

       public void endElement(String uri, String localName, String qName) throws SAXException {

           if (content.toString().trim().isEmpty()) {

               try {

                   outputStream.write(("</" + qName + ">").getBytes());

               } catch (IOException e) {

                   e.printStackTrace();

               }

           } else {

               try {

                   outputStream.write(("<" + qName + ">").getBytes());

                   outputStream.write(content.toString().getBytes());

                   outputStream.write(("</" + qName + ">").getBytes());

               } catch (IOException e) {

                   e.printStackTrace();

               }

           }

           content.setLength(0);

       }

       @Override

       public void endDocument() throws SAXException {

           try {

               outputStream.close();

           } catch (IOException e) {

               e.printStackTrace();

           }

       }

       @Override

       public void startDocument() throws SAXException {

           try {

               outputStream = new FileOutputStream("path/to/xml/file.xml");

           } catch (IOException e) {

               e.printStackTrace();

           }

       }

   }