1 //dom4j添加内容，在第一本书上指定位置添加售价 更改保存所有孩子list集合的顺序
2 @Test
3 public void add1() throws Exception{
4 //读
5 SAXReader reader = new SAXReader();
6 Document document = reader.read(new File("src/book.xml"));
7
8 //添加
9 Element book = document.getRootElement().element("书");
10 List list = book.elements();//[书名、作者、售价]
11 Element price = DocumentHelper.createElement("售价");
12 price.setText("309");
13 list.add(2,price);
14
15 //输出
16 OutputFormat format = OutputFormat.createPrettyPrint();
17 format.setEncoding("UTF-8");
18 XMLWriter writer = new XMLWriter(new FileOutputStream("src/book.xml"),format);
19 writer.write(document);
20 writer.close();
21
22 }
23 @Test
24 public void deleat() throws Exception{
25 //读
26 SAXReader reader = new SAXReader();
27 Document document = reader.read(new File("src/book.xml"));
28
29 //删除
30 Element price = document.getRootElement().element("书").element("售价");
31 price.getParent().remove(price);
32
33 //输出
34 OutputFormat format = OutputFormat.createPrettyPrint();
35 format.setEncoding("UTF-8");
36 XMLWriter writer = new XMLWriter(new FileOutputStream("src/book.xml"),format);
37 writer.write(document);
38 writer.close();
39
40 }
