private static void selectALL() throws Exception {

     /**

      *

      * 1.创建DocumentFacTory工厂

      * 2.通过Document Factory工厂得到DocumentBuilder

      * 3.解析xml得到Document对象

      */

     //创建工厂

     DocumentBuilderFactory documentBuilderFactory=DocumentBuilderFactory.newInstance();

     //创建BUilder

     DocumentBuilder documentBuilder=documentBuilderFactory.newDocumentBuilder();

     //解析xml 获得document对象

     Document document=documentBuilder.parse("src/com//zyf/test.xml");

     //获得所有name元素

     NodeList list=document.getElementsByTagName("sex");

     //遍历

     for(int i=0;i<list.getLength();i++){

         Node node1=list.item(i);

         System.out.println(node1.getTextContent());

     }

 }

public static void addSex() throws Exception{

    //创建工厂

    DocumentBuilderFactory documentBuilderFactory=DocumentBuilderFactory.newInstance();

    //获得builder

    DocumentBuilder documentBuilder=documentBuilderFactory.newDocumentBuilder();

    //获得deocument

    Document document=documentBuilder.parse("src/com/zyf/test.xml");

    //创建节点<sex>nv</sex>

    Node sex=document.createElement("sex");

    //在sex中创建文本

    Node text=document.createTextNode("nv");

//    sex.setTextContent("nv");

    sex.appendChild(text);

    //得到sex的父节点<p1>

    NodeList list=document.getElementsByTagName("p1");

    Node node1=list.item(0);

    //添加进父节点p1

    node1.appendChild(sex);

    //回写

    TransformerFactory transformerFactory=TransformerFactory.newInstance();

    Transformer transformer=transformerFactory.newTransformer();

    transformer.transform(new DOMSource(document),new StreamResult("src/com/zyf/test.xml"));

}

public static void removeSex()throws Exception{

    //创建工厂

    DocumentBuilderFactory documentBuilderFactory=DocumentBuilderFactory.newInstance();

    //闯将builder

    DocumentBuilder documentBuilder=documentBuilderFactory.newDocumentBuilder();

    //获得document

    Document document=documentBuilder.parse("src/com/zyf/test.xml");

    //获得sex的父节点

    //获得sex

    NodeList list=document.getElementsByTagName("sex");

    Node node1=list.item(0);

    //获得sex的父节点

    Node parent=node1.getParentNode();

    //remove

    parent.removeChild(node1);

    //回写

    //回写工厂

    TransformerFactory transformerFactory=TransformerFactory.newInstance();

    Transformer transformer=transformerFactory.newTransformer();

    transformer.transform(new DOMSource(document), new StreamResult("src/com/zyf/test.xml"));

}[Document是Node的子类]