Dom4j解析XML文件

// iterate through child elements of root
for ( Iterator i = root.elementIterator(); i.hasNext(); ) {
    Element element = (Element) i.next();
    // do something
}

// iterate through child elements of root with element name "foo"
for ( Iterator i = root.elementIterator( "foo" ); i.hasNext(); ) {
    Element foo = (Element) i.next();
    // do something
}

// iterate through attributes of root 
for ( Iterator i = root.attributeIterator(); i.hasNext(); ) {
    Attribute attribute = (Attribute) i.next();
    // do something
}

public void treeWalk(Element element) {
        for ( int i = 0, size = element.nodeCount(); i < size; i++ ) {
            Node node = element.node(i);
            if ( node instanceof Element ) {
                treeWalk( (Element) node );
            }
            else {
                // do something....
            }
        }
    }

1.读取XML文件,获得document对象              
        AXReader reader = new SAXReader();              
        Document   document = reader.read(new File("csdn.xml"));  
2.解析XML形式的文本,得到document对象.  
        String text = "<csdn></csdn>";           
        Document document = DocumentHelper.parseText(text);  
3.主动创建document对象.  
        Document document = DocumentHelper.createDocument();            
        Element root = document.addElement("csdn");  

String text = document.asXML();

第一种：简易格式：（不考虑编码，不考虑格式）
XMLWriter xmlWriter = new XMLWriter(new FileWriter("four.xml");
xmlWriter.write(document);
xmlWriter.close();

第二种：精确格式：（考虑编码，考虑格式）
OutputFormat of = OutputFormat.createPrettyPrint();
//OutputFormat of = new OutputFormat();
of.setEncoding("utf-8");
XMLWriter xmlWriter = new XMLWriter(new FileWriter("four.xml"), of);
xmlWriter.write(document);
xmlWriter.close();

1.获取文档的根节点.  
      Element root = document.getRootElement();  
    2.取得某个节点的子节点.  
      Element element=node.element(“四大名著");  
    3.取得节点的文字  
        String text=node.getText();  
    4.取得某节点下所有名为“csdn”的子节点，并进行遍历.  
       List nodes = rootElm.elements("csdn");   
         for (Iterator it = nodes.iterator(); it.hasNext();) {     
      Element elm = (Element) it.next();    
    // do something  
 }  
     5.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();        
       // do something   
 }  
    6.在某节点下添加子节点  
      Element elm = newElm.addElement("朝代");  
    7.设置节点文字.  elm.setText("明朝");  
    8.删除某节点.//childElement是待删除的节点,parentElement是其父节点  parentElement.remove(childElment);  
    9.添加一个CDATA节点.Element contentElm = infoElm.addElement("content");contentElm.addCDATA(“cdata区域”);  

来自 <http://blog.csdn.net/redarmy_chen/article/details/12969219> 

1.取得某节点下的某属性    Element root=document.getRootElement();        //属性名name  
         Attribute attribute=root.attribute("id");  
    2.取得属性的文字  
    String text=attribute.getText();  
    3.删除某属性 Attribute attribute=root.attribute("size"); root.remove(attribute);  
    4.遍历某节点的所有属性     
      Element root=document.getRootElement();        
       for(Iterator it=root.attributeIterator();it.hasNext();){          
           Attribute attribute = (Attribute) it.next();           
           String text=attribute.getText();          
           System.out.println(text);    
  }  
    5.设置某节点的属性和文字.   newMemberElm.addAttribute("name", "sitinspring");  
    6.设置属性的文字   Attribute attribute=root.attribute("name");   attribute.setText("csdn");  

来自 <http://blog.csdn.net/redarmy_chen/article/details/12969219>