dom读写xml。

package DomXmlDemo;

import org.junit.Test;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.File;
import java.io.IOException;

public class DomXmlDem {

    @Test
    public  void  test() throws ParserConfigurationException, IOException, SAXException {

        DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
        DocumentBuilder db=dbf.newDocumentBuilder();
        Document documentu=db.parse("src\\DomXmlDemo\\stu.xml");
        NodeList nodeList=documentu.getChildNodes();

        for(int i=0; i<nodeList.getLength(); i++){
           Node nodj=nodeList.item(i);
           NodeList nodelistj=nodj.getChildNodes();
//            System.out.println(i+ "--node-name:"+nodj.getNodeName()+"  "+nodj.getTextContent());
           for(int j=0; j<nodelistj.getLength(); j++)
           {
             Node nodek=nodelistj.item(j);
             NodeList nodeListk=nodek.getChildNodes();
//               System.out.println(j+ "--node-name:"+nodek.getNodeName()+"  "+nodek.getTextContent());
               if(nodek.getNodeType()==Node.ELEMENT_NODE)
               {
                   for(int k=0; k<nodeListk.getLength(); k++)
                   {
                       Node node=nodeListk.item(k);
                       System.out.println(k+ "--node-name:"+node.getNodeName()+"  "+node.getTextContent());
                   }
               }
           }


        }


    }


    @Test
    public  void test2() throws ParserConfigurationException, IOException, SAXException {

        DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
        DocumentBuilder db=dbf.newDocumentBuilder();
        Document document=db.parse("src\\DomXmlDemo\\stu.xml");
        Element  element=document.getDocumentElement();
        NodeList nodeListk=element.getElementsByTagName("book");

        for(int k=0; k<nodeListk.getLength(); k++)
        {
            Node node=nodeListk.item(k);
            System.out.println(k+ "--node-name:"+node.getNodeName()+"  "+node.getTextContent());
        }
    }

    @Test
    public  void test3() throws ParserConfigurationException, TransformerException {
    DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
    DocumentBuilder db=dbf.newDocumentBuilder();
    Document document=db.newDocument();
    if(document!=null){

        Element element=document.createElement("student");
        Element age=document.createElement("age");
        age.appendChild(document.createTextNode("text"));
        Element love=document.createElement("game");
        love.appendChild(document.createTextNode("make love"));
        element.setAttribute("sex", "man");
        element.setAttribute("name", "jack");
        element.appendChild(age);
        element.appendChild(love);
        document.appendChild(element);
        TransformerFactory  trf=TransformerFactory.newInstance();
        Transformer tf=trf.newTransformer();
        DOMSource dom=new DOMSource(document);

        File f=new File("student.xml");
        StreamResult  srt=new StreamResult(f);
        tf.transform(dom, srt);

    }



    }



}