book2.xml
<?xml version="1.0" encoding="UTF-8"?> <书架> <书> <书名>JAVA</书名> <作者>XXXXXX</作者> <售价>23333</售价> </书> <书> <书名>ANDROID</书名> <作者>XXXXXX</作者> <售价>23333</售价> </书> </书架>
增删改查方法:
public class dom4j2 { public static void main(String[] args) throws Exception { // find(); // add(); // update(); // del(); // attr(); } private static void attr() throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read("book2.xml"); Element rootElement = document.getRootElement(); Element bookEle = rootElement.element("书"); bookEle.addAttribute("出版社", "xxxxxx"); // 查询出版社 String publish = bookEle.attributeValue("出版社"); System.out.println(publish); // 删除出版社 Attribute attr = bookEle.attribute("出版社"); attr.getParent().remove(attr); XMLWriter writer = new XMLWriter(new FileOutputStream("book2.xml"), OutputFormat.createPrettyPrint()); writer.write(document); writer.close(); } private static void del() throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read("book2.xml"); Element rootElement = document.getRootElement(); Element price2Ele = rootElement.element("书").element("特价"); price2Ele.getParent().remove(price2Ele); XMLWriter writer = new XMLWriter(new FileOutputStream("book2.xml"), OutputFormat.createPrettyPrint()); writer.write(document); writer.close(); } private static void update() throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read("book2.xml"); Element rootElement = document.getRootElement(); rootElement.element("书").element("特价").setText("50"); XMLWriter writer = new XMLWriter(new FileOutputStream("book2.xml"), OutputFormat.createPrettyPrint()); writer.write(document); writer.close(); } public static void add() throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read("book2.xml"); Element rootElement = document.getRootElement(); // 创建 <特价>结点 设置标签体 Element price2 = DocumentHelper.createElement("特价"); price2.setText("23232"); // 获取父节点 并挂载 Element bookEle1 = rootElement.element("书"); bookEle1.add(price2); // 将内存中的dom树写到xml文件里 // 方法1 // FileWriter fw = new FileWriter("book2.xml"); // document.write(fw); // fw.flush(); // fw.close(); // 方法2 XMLWriter writer = new XMLWriter(new FileOutputStream("book2.xml"), OutputFormat.createPrettyPrint());// 格式化xml文件 writer.write(document); writer.close(); } public static void find() throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read("book2.xml"); Element rootElement = document.getRootElement(); List<Element> elements = rootElement.elements(); Element book2Ele = elements.get(1); System.out.println(book2Ele.element("书名").getText()); } }