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
      
        elements = rootElement.elements();		Element book2Ele = elements.get(1);		System.out.println(book2Ele.element("书名").getText());	}}