DOM解析XML的增删改查实现

               

   前面的XML读取算是已经完成了，现在是使用DOM对他进行增删改查，这个才是DOM的优势所在，其实代码很简单，不需要过多的解释，下面代码奉上

   

package com.bird.xml;import java.io.FileOutputStream;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import org.w3c.dom.Document;import org.w3c.dom.Element;/** * @use 对XML文档进行插入删除操作 * @author Bird * */public class XmlChange { public Document getDocument() throws Exception{//返回XML文档的Document对象  //1创建工厂  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();    //2.得到解析器  DocumentBuilder builder = factory.newDocumentBuilder();    //3.解析XML文档，获得代表文档的Document  Document document = builder.parse("d://book.xml");    return document; }  public void add() throws Exception{//往XML文档中插入节点  Document document = getDocument();    //创建节点  Element price = document.createElement("售价");  price.setTextContent("99.00元");    //把创建的节点挂到第一本书上  Element book = (Element) document.getElementsByTagName("书").item(0);  book.appendChild(price);    //把更新后的内存重新写到文件中  TransformerFactory tsfactory = TransformerFactory.newInstance();  Transformer transform = tsfactory.newTransformer();  transform.transform(new DOMSource(document), new StreamResult(new FileOutputStream("d://book.xml"))); }   public void add1() throws Exception{//往XML文档中指定节点处插入节点  Document document = getDocument();    //创建节点  Element price = document.createElement("售价");  price.setTextContent("99.00元");    //得到参考节点  Element refElement = (Element) document.getElementsByTagName("售价").item(0);    //得到要插入的主节点  Element book = (Element) document.getElementsByTagName("书").item(0);    //往book节点的指定位置插入  book.insertBefore(price, refElement);    //把更新后的内存重新写到文件中  TransformerFactory tsfactory = TransformerFactory.newInstance();  Transformer transform = tsfactory.newTransformer();  transform.transform(new DOMSource(document), new StreamResult(new FileOutputStream("d://book.xml"))); }   public void add2() throws Exception{//往XML文档中指定节点处更改属性  Document document = getDocument();    //得到需要插入属性的节点  Element bookname = (Element) document.getElementsByTagName("书名").item(0);    //插入属性值  bookname.setAttribute("name", "XXXXX");      //把更新后的内存重新写到文件中  TransformerFactory tsfactory = TransformerFactory.newInstance();  Transformer transform = tsfactory.newTransformer();  transform.transform(new DOMSource(document), new StreamResult(new FileOutputStream("d://book.xml"))); }   public void delete() throws Exception{//删除指定节点  Document document = getDocument();    //得到要删除的节点  Element e = (Element) document.getElementsByTagName("售价").item(0);    //得到父节点后删除自己  e.getParentNode().removeChild(e);    //把更新后的内存重新写到文件中  TransformerFactory tsfactory = TransformerFactory.newInstance();  Transformer transform = tsfactory.newTransformer();  transform.transform(new DOMSource(document), new StreamResult(new FileOutputStream("d://book.xml"))); }   public void update() throws Exception{//更新指定节点内容  Document document = getDocument();    //得到需要更新的节点  Element price = (Element) document.getElementsByTagName("售价").item(0);  price.setTextContent("109元");    //把更新后的内存重新写到文件中  TransformerFactory tsfactory = TransformerFactory.newInstance();  Transformer transform = tsfactory.newTransformer();  transform.transform(new DOMSource(document), new StreamResult(new FileOutputStream("d://book.xml"))); }  public static void main(String [] args) throws Exception{  XmlChange xml = new XmlChange(); // xml.add(); // xml.add1();//往指定位置插入元素 // xml.add2();//往指定节点添加属性 // xml.delete();//删除指定的节点  xml.update();//更新指定节点内容 }}

           

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