XML (7)

来源：互联网发布：淘宝红人模特排行榜编辑：程序博客网时间：2024/04/28 06:10

dom4j解析
增删改查

src/book.xml

<书架>   <书>     <书名 id="a1" name="shuming">JAVA1</书名>      <作者>张1</作者>      <价格>109</价格>   </书>    <书>     <书名 name="XXXX">JAVA2</书名>      <作者>hhh</作者>      <价格>12(2)</价格>   </书> </书架>

public class demo5 {    //读取XML文档第二本书的 <书名>JAVA2</书名>    @Test    public  void read()throws Exception    {          SAXReader reader = new SAXReader();          Document document = reader.read(new File("src/book.xml"));          Element root = document.getRootElement();          Element element =  (Element) root.elements("书").get(1);          String valueString =  element.element("书名").getText();          System.out.println(valueString);    }    //得到第二本书的属性 <书名 name="XXXX">JAVA2</书名>    @Test    public  void readAttr()throws Exception    {          SAXReader reader = new SAXReader();          Document document = reader.read(new File("src/book.xml"));          Element root = document.getRootElement();          Element book =  (Element) root.elements("书").get(1);          String valueString =  book.element("书名").attributeValue("name");          System.out.println(valueString);    }    //在第一本书上添加一个新的售价<售价>209元</售价>    @Test    public void add() throws Exception    {        SAXReader reader = new SAXReader();        Document document = reader.read(new File("src/book.xml"));        Element book = document.getRootElement().element("书");        book.addElement("售价").setText("209元");        OutputFormat of = OutputFormat.createPrettyPrint();        of.setEncoding("UTF-8");        XMLWriter writer = new XMLWriter( new FileOutputStream("src/book.xml"),of);        writer.write( document );        writer.close();    }    //在第一本书指定位置添加新的售价<售价>209元</售价>  更改list集合顺序    @Test    public void add2()throws Exception    {        SAXReader reader = new SAXReader();        Document document = reader.read(new File("src/book.xml"));        Element book = document.getRootElement().element("书");        List<Element> list = book.elements();        Element price =DocumentHelper.createElement("售价");        price.setText("209元");        list.add(2,price);        OutputFormat of = OutputFormat.createPrettyPrint();        of.setEncoding("UTF-8");        XMLWriter writer = new XMLWriter( new FileOutputStream("src/book.xml"),of);        writer.write( document );        writer.close();    }    //删除第一本书的 <售价>209元</售价>    @Test    public  void delete()throws Exception    {        SAXReader reader = new SAXReader();        Document document = reader.read(new File("src/book.xml"));        Element price = document.getRootElement().element("书").element("售价");        price.getParent().remove(price);        OutputFormat of = OutputFormat.createPrettyPrint();        of.setEncoding("UTF-8");        XMLWriter writer = new XMLWriter( new FileOutputStream("src/book.xml"),of);        writer.write( document );        writer.close();    }    //更新第二本书的作者    @Test    public void update() throws Exception    {        SAXReader reader = new SAXReader();        Document document = reader.read(new File("src/book.xml"));        Element book = (Element) document.getRootElement().elements("书").get(1);        book.element("作者").setText("hhh");        OutputFormat of = OutputFormat.createPrettyPrint();        of.setEncoding("UTF-8");        XMLWriter writer = new XMLWriter( new FileOutputStream("src/book.xml"),of);        writer.write( document );        writer.close();    }}

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