XML(五)dom4j增删改查

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文件中// 方法1// FileWriter fw = new FileWriter("book2.xml");// document.write(fw);// fw.flush();// fw.close();// 方法2XMLWriter 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());}}

临行之前，面对太多的疑问和不解：

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