Java如何使用dom4j获取,添加,删除,查找,设置Element节点呢？

获取文档的根节点

Element rootElm = document.getRootElement(); 

取得某节点的单个子节点

Element memberElm=root.element("user");// "user"是节点名

取得节点的文字

String text=memberElm.getText();//也可以用:
String text=root.elementText("name");//这个是取得根节点下的name字节点的文字.

取得某节点下名为"user"的所有字节点并进行遍历

list nodes = rootElm.elements("user"); 
for (Iterator it = nodes.iterator(); it.hasNext();) { 
  Element elm = (Element) it.next(); 
  //运行业务代码
} 

对某节点下的所有子节点进行遍历

for(Iterator it=root.elementIterator();it.hasNext();){ 
  Element element = (Element) it.next(); 
   //业务代码
} 

在某节点下添加子节点

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

设置节点文字

ageElm.setText("88"); 

删除某节点

parentElm.remove(childElm);// childElm是待删除的节点,parentElm是其父节点 

添加一个CDATA节点

Element contentElm = infoElm.addElement("content");
contentElm.addCDATA(diary.getContent());

public void modifyDoc() {
    try {
        Document doc = reader.read(new File("file/test.xml"));
        //修改节点内容
        List list = doc.selectNodes("//user");
        Iterator<Element> it = list.iterator();
        while (it.hasNext()) {
            Element el = it.next();
            fail(el.getName() + "#" + el.getText() + "#" + el.getStringValue());
            //修改title元素
            Iterator<Element> elIter = el.elementIterator("title");
            while(elIter.hasNext()) {
                Element titleEl = elIter.next();
                fail(titleEl.getName() + "#" + titleEl.getText() + "#" + titleEl.getStringValue());
                if ("Java configuration with XML Schema".equals(titleEl.getTextTrim())) {
                    //修改元素文本值
                    titleEl.setText("Modify the Java configuration with XML Schema");
                    fail(titleEl.getName() + "#" + titleEl.getText() + "#" + titleEl.getStringValue());
                }
            }
        }
        
        //修改节点子元素内容
        list = doc.selectNodes("//user/author");
        it = list.iterator();
        while (it.hasNext()) {
            Element el = it.next();
            fail(el.getName() + "#" + el.getText() + "#" + el.getStringValue());
            List<Element> childs = el.elements();
            for (Element e : childs) {
                fail(e.getName() + "#" + e.getText() + "#" + e.getStringValue());
                if ("Marcello".equals(e.getTextTrim())) {
                    e.setText("Ayesha");
                } else if ("Vitaletti".equals(e.getTextTrim())) {
                    e.setText("Malik");
                } 
                fail(e.getName() + "#" + e.getText() + "#" + e.getStringValue());
            }
        }
        
        //写入到文件
        /*XMLWriter output = new XMLWriter(new FileWriter(new File("file/test.xml")));
        output.write(doc);
        output.close();*/
    } catch (DocumentException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}