一:将dom4j的jar包导入目标工程 二:`public class Dom4jTest { public static void main(String[] args) throws Exception {
try { run5(); } catch (DocumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 查询,获取作者的文本内容 * * 获取第二个节点的作者的文本内容 * @throws DocumentException */ public static void run1() throws DocumentException{ //获取解析器对象 SAXReader reader=new SAXReader(); //解析,获取document对象 Document document = reader.read("src/book4.xml"); //获取根节点 Element rootElement = document.getRootElement(); //获取根节点的所有子节点的集合 List elements = rootElement.elements(); Element book2 = (Element) elements.get(1); Element author = book2.element("作者"); String text = author.getText(); System.out.println(text); } //添加子节点,注意回写 public static void run2() throws Exception{ SAXReader reader=new SAXReader(); Document document = reader.read("src/book4.xml"); Element root = document.getRootElement(); List books = root.elements("书"); Element book2 = (Element) books.get(1); book2.addElement("猫").setText("我是猫");//此时还都只是在内存中的操作 //接下来进行回写的操作 //创建一个漂亮的格式 OutputFormat format=OutputFormat.createPrettyPrint(); org.dom4j.io.XMLWriter writer=new org.dom4j.io.XMLWriter(new FileOutputStream("src/book4.xml"),format); writer.write(document); writer.close(); } public static void run3() throws Exception{ SAXReader reader=new SAXReader(); Document document = reader.read("src/book4.xml"); Element rootElement = document.getRootElement(); Element book2 = (Element) rootElement.elements("书").get(1); List<Element> elements = book2.elements(); //创建一个元素对象 Element dog = DocumentHelper.createElement("狗"); dog.setText("大狗"); elements.add(1,dog); //回写之前添加漂亮的格式 OutputFormat format=OutputFormat.createPrettyPrint(); org.dom4j.io.XMLWriter writer=new org.dom4j.io.XMLWriter(new FileOutputStream("src/book4.xml"),format); writer.write(document); writer.close(); } //删除子节点 public static void run5() throws Exception{ SAXReader reader=new SAXReader(); Document document = reader.read("src/book4.xml"); Element rootElement = document.getRootElement(); //获取猫 Element book2 = (Element) rootElement.elements("书").get(1); Element cat = book2.element("猫"); //获取父节点 //cat.getParent(); book2.remove(cat); //回写之前添加漂亮的格式 OutputFormat format=OutputFormat.createPrettyPrint(); org.dom4j.io.XMLWriter writer=new org.dom4j.io.XMLWriter(new FileOutputStream("src/book4.xml"),format); writer.write(document); writer.close(); }} `
