DOM4j中，獲得Document對象的方式有三種：

1.讀取XML文件,獲得document對象????????????

???????????????????SAXReader reader = new SAXReader();
????????????? Document?? document = reader.read(new File("input.xml"));

2.解析XML形式的文本,得到document對象.

?????????????????? String text = "<members></members>";
????????????? Document document = DocumentHelper.parseText(text);

3.主動創建document對象.

????????????????? Document document = DocumentHelper.createDocument();
???????????? //創建根節點

??????????????????Element root = document.addElement("members");

Tip：節點對象

1.獲取文檔的根節點.

??????Element root = document.getRootElement();

2.取得某個節點的子節點.

Element element=node.element(“書名");

3.取得節點的文字

??????String text=node.getText();

4.取得某節點下所有名為“member”的子節點，并進行遍歷.
?List nodes = rootElm.elements("member");
??for (Iterator it = nodes.iterator(); it.hasNext();) {
???? Element elm = (Element) it.next();
????// do something
?}

5.對某節點下的所有子節點進行遍歷.

for(Iterator it=root.elementIterator();it.hasNext();){

???????Element element = (Element) it.next();

???????// do something
????}

6.在某節點下添加子節點.

Element ageElm = newMemberElm.addElement("age");

7.設置節點文字.

?element.setText("29");

8.刪除某節點.

//childElm是待刪除的節點,parentElm是其父節點

parentElm.remove(childElm);

9.添加一個CDATA節點.
Element contentElm = infoElm.addElement("content");

contentElm.addCDATA(diary.getContent());

???????節點對象屬性

1.取得某節點下的某屬性
????Element root=document.getRootElement();????

//屬性名name

?????????Attribute attribute=root.attribute("size");

2.取得屬性的文字

???String text=attribute.getText();

?3.刪除某屬性
?Attribute attribute=root.attribute("size");

?root.remove(attribute);

3.遍歷某節點的所有屬性

???Element root=document.getRootElement();???

??for(Iterator it=root.attributeIterator();it.hasNext();){

?????????Attribute attribute = (Attribute) it.next();

?????????String text=attribute.getText();

?????????System.out.println(text);

????}

4.設置某節點的屬性和文字.

???newMemberElm.addAttribute("name", "sitinspring");

5.設置屬性的文字

??Attribute attribute=root.attribute("name");

???attribute.setText("sitinspring");