Bagaimana untuk menghuraikan dan menjana dokumen XML menggunakan perpustakaan parsing XML dalam Java?

import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.DocumentBuilder; import org.w3c.dom.Document; import org.w3c.dom.NodeList; import org.w3c.dom.Node; import org.w3c.dom.Element; public class DOMParser { public static void main(String[] args) { try { DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.parse("example.xml"); NodeList nodeList = document.getElementsByTagName("student"); for (int i = 0; i < nodeList.getLength(); i++) { Node node = nodeList.item(i); if (node.getNodeType() == Node.ELEMENT_NODE) { Element element = (Element) node; String id = element.getAttribute("id"); String name = element.getElementsByTagName("name").item(0).getTextContent(); String age = element.getElementsByTagName("age").item(0).getTextContent(); System.out.println("Student ID: " + id); System.out.println("Name: " + name); System.out.println("Age: " + age); } } } 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 SAXParserExample { public static void main(String[] args) { try { SAXParserFactory factory = SAXParserFactory.newInstance(); SAXParser parser = factory.newSAXParser(); DefaultHandler handler = new DefaultHandler() { boolean bName = false; boolean bAge = false; public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { if (qName.equalsIgnoreCase("name")) { bName = true; } if (qName.equalsIgnoreCase("age")) { bAge = true; } } public void characters(char[] ch, int start, int length) throws SAXException { if (bName) { System.out.println("Name: " + new String(ch, start, length)); bName = false; } if (bAge) { System.out.println("Age: " + new String(ch, start, length)); bAge = false; } } }; parser.parse("example.xml", handler); } catch (Exception e) { e.printStackTrace(); } } }

import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.DocumentBuilder; import org.w3c.dom.Document; import org.w3c.dom.Element; public class DOMGenerator { public static void main(String[] args) { try { DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.newDocument(); Element root = document.createElement("students"); document.appendChild(root); Element student = document.createElement("student"); root.appendChild(student); Element name = document.createElement("name"); name.appendChild(document.createTextNode("John")); student.appendChild(name); Element age = document.createElement("age"); age.appendChild(document.createTextNode("20")); student.appendChild(age); // ... 追加更多的节点和数据 // 保存为XML文件 TransformerFactory transformerFactory = TransformerFactory.newInstance(); Transformer transformer = transformerFactory.newTransformer(); DOMSource source = new DOMSource(document); StreamResult result = new StreamResult(new File("example.xml")); transformer.transform(source, result); } catch (Exception e) { e.printStackTrace(); } } }

import org.jdom2.Document; import org.jdom2.Element; import org.jdom2.output.Format; import org.jdom2.output.XMLOutputter; public class JDOMGenerator { public static void main(String[] args) { try { Element root = new Element("students"); Document document = new Document(root); Element student = new Element("student"); root.addContent(student); Element name = new Element("name"); name.setText("John"); student.addContent(name); Element age = new Element("age"); age.setText("20"); student.addContent(age); // ... 添加更多节点和数据 // 输出为XML字符串 XMLOutputter outputter = new XMLOutputter(Format.getPrettyFormat()); String xmlString = outputter.outputString(document); System.out.println(xmlString); } catch (Exception e) { e.printStackTrace(); } } }