dom4j增删改查

 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     }