DOM4J解析XML(强大的XPath)

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<?xml version="1.0" encoding="UTF-8"?>

<书架>
<书>
<书名>JAVA就业培训教程</书名>
<页数>600</页数>
<作者>wanteng</作者>
</书>
<书>
<书名>XML入门</书名>
<作者>王腾</作者>
<价钱>43.00元</价钱>
</书>
</书架>

public class Demo1 {

@Test
public void read() 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 bookname = book.element("书名").getText();
System.out.println(bookname);
}

@Test
public void add() throws Exception{
SAXReader reader = new SAXReader();
Document document = reader.read(new File("src/book.xml"));

Element root = document.getRootElement();
Element book = root.element("书");
List list = book.elements(); //获得书标签下的所有标签

Element price = DocumentHelper.createElement("页数");
price.setText("600");

list.add(1,price);
//写入到XML中
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("UTF-8");

XMLWriter writer=new XMLWriter(new FileOutputStream("src/book.xml"),format);
writer.write(document);
writer.close();
}

@Test
public void delete() throws Exception{
SAXReader reader = new SAXReader();
Document document = reader.read(new File("src/book.xml"));

Element root = document.getRootElement();
Element book = root.element("书");
Element price = book.element("售价");
price.getParent().remove(price);

//写入到XML中
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("UTF-8");

XMLWriter writer=new XMLWriter(new FileOutputStream("src/book.xml"),format);
writer.write(document);
writer.close();
}

}

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